CN113237793B - Display experiment method and device for coupling bubble internal flow and bubble external mass transfer - Google Patents
Display experiment method and device for coupling bubble internal flow and bubble external mass transfer Download PDFInfo
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- CN113237793B CN113237793B CN202110498469.2A CN202110498469A CN113237793B CN 113237793 B CN113237793 B CN 113237793B CN 202110498469 A CN202110498469 A CN 202110498469A CN 113237793 B CN113237793 B CN 113237793B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8405—Application to two-phase or mixed materials, e.g. gas dissolved in liquids
Abstract
The invention relates to a display experiment method and a display experiment device for coupling bubble internal flow and bubble external mass transfer. By utilizing the resazurin color development reaction and taking smoke as tracer particles, prepared resazurin solution, sodium hydroxide solution and glucose solution with certain concentration are added into a bubble observation chamber to reach a certain liquid level, mixed gas of oxygen and the smoke is introduced, and the phenomena of fluid flow inside the bubbles and liquid phase mass transfer outside the bubbles are displayed simultaneously by means of a high-speed camera and an image processing system. The phenomenon of the flow inside the captured bubbles is obvious, and the tail trace of the mass transfer outside the bubbles is clear.
Description
[ technical field ] A
The invention belongs to the field of chemical separation and mass transfer, and particularly relates to a display experiment method and device for coupling bubble internal flow and bubble external mass transfer.
[ background of the invention ]
Rectification is widely applied to separation of liquid mixtures, and has the advantages of large treatment capacity, strong applicability and the like, but the separation efficiency is low due to insufficient gas-liquid phase contact on a rectification column plate. For the high-purity separation of a near-boiling point mixture, an azeotropic mixture and the like, the low separation efficiency can cause the problems of serious energy consumption and the like. The main form of gas-liquid coexistence on the rectifying tower plate is bubbles, and the process of transferring volatile components in the mixture from a gas phase to a liquid phase is mainly influenced by mass transfer on an interface, a liquid side and a gas side. Research on the internal flow and the external transfer of bubbles is of great significance to the strengthening of the rectification process, but the prior experimental method and device for simultaneously displaying the internal flow and the external transfer of the bubbles still have great breakthrough, so that the development of the experimental method and the device which can display the internal flow of the bubbles and reflect the external transfer of the bubbles is urgently needed.
[ summary of the invention ]
[ problem to be solved ]
The invention aims to solve the problem that the current research on the internal flow and the external mass transfer of bubbles lacks a proper research method and device, and simultaneously captures the internal flow phenomenon and the external mass transfer behavior of rising bubbles by means of an image capture processing technology, so that the fluid flow and mass transfer phenomenon can be further deeply analyzed, and a display experimental device for coupling the internal flow and the external mass transfer of bubbles can be further developed.
[ solution ]
The invention is realized by the following technical scheme.
The invention overcomes the defect that the phenomenon of internal flow and external mass transfer of bubbles cannot be captured and displayed simultaneously, and provides a display experiment method and a display experiment device for coupling the internal flow and the external mass transfer of bubbles. The invention relates to a preparation method of resazurin solution, sodium hydroxide solution and glucose solution with proper concentration, which is important for a display experiment method for coupling bubble internal flow and bubble external mass transfer. The resazurin solution, the sodium hydroxide solution and the glucose solution are used as liquid phases, pure oxygen is used as a gas phase, the resazurin dissolved in the liquid at the beginning is blue, at the moment, the excessive sodium hydroxide solution and the glucose solution are added, the resazurin is reduced into pink resorufin solution, and the resazurin is further reduced into colorless resorufin solution by the excessive glucose. After pure oxygen is introduced, the colorless bihydrogen resorufin solution is oxidized into pink resorufin solution again, and the phenomenon of outer bubble mass transfer can be well displayed and captured according to the color change phenomenon of the reaction. Meanwhile, the smoke tracer agent wrapped by the oxygen forms a smoke line along with the rising process of the oxygen bubbles, and can be used for capturing the flowing phenomenon of fluid in the bubbles.
A display experiment method and device for coupling bubble internal flow and bubble external mass transfer are mainly characterized by comprising the following devices: the device comprises a smoke generator (S1), an oxygen gas storage tank (S2), a surplus smoke collector (S3), a rectangular mixer (S4), a laser generator (S5), a laser light guide arm (S6), a laser output cylinder (S7), a bubble observation chamber (S8), a bubbling needle (S9), a buffer chamber (S10), a high-speed camera (S11), an image processing system (S12), an air pump (P1), an oxygen peristaltic pump (P2), a smoke valve (V1), a surplus smoke valve (V2), an air valve (V3) and a mixed smoke valve (V4); an air pump (P1) is connected with a bubble observation chamber (S8) through an air valve (V3), a buffer chamber (S10) and a bubbling needle (S9) in sequence to introduce air into the bubble observation chamber (S8), the bubble observation chamber (S8) is filled with a resazurin solution, a sodium hydroxide solution and a glucose solution which are prepared at a certain liquid level height, a smoke generator (S1) is connected with a rectangular mixer (S4) through a smoke valve (V1) to introduce a smoke tracer into the rectangular mixer (S4), fine tube interfaces on four surfaces of the rectangular mixer (S4) are respectively connected with the smoke valve (V1), an oxygen peristaltic pump (P2), an excess smoke valve (V2) and a mixed smoke valve (V4), the excess smoke valve (V2) is connected with an excess smoke collector (S3) to introduce excess smoke in the rectangular mixer (S4) into the excess smoke collector (S3), the oxygen pump (P2) is connected with an oxygen storage tank (S2) to convey oxygen into the rectangular mixer (S4), the mixed smoke valve (V4) is sequentially connected with the buffer chamber (S10), the bubbling needle (S9) and the bubble observation chamber (S8), the laser generator (S5) is sequentially connected with the laser light guide arm (S6) and the laser output cylinder (S7) so that laser vertically irradiates the bubble observation chamber (S8) downwards, and the high-speed camera (S11) is connected with the image processing system (S12) to capture and process images.
It is preferable that: the concentration range of the prepared resazurin solution is 0.12g/L-1.2g/L, the concentration range of the sodium hydroxide solution is 0.5g/L-2.0g/L, and the concentration range of the glucose solution is 15g/L-45g/L.
It is preferable that: the side length of the rectangular mixer (S4) is 8cm-12cm, four surfaces of the rectangular mixer are connected with four thin tube interfaces, and the tube diameters of the thin tube interfaces are 5mm-8mm.
It is preferable that: the liquid level height in the bubble injection observation chamber (S8) is 12cm-18cm.
It is preferable that: the laser output cylinder (S7) is vertically downward 40-55 cm away from the liquid level of the solution in the bubble observation chamber (S8), and the laser forms an angle of 90 degrees with the liquid level in the bubble observation chamber (S8).
Because the liquid in the bubble observation chamber (S8) is easy to flow backwards, the invention adopts the passage of the independent air pump (P1) connected with the air valve (V3) for ventilation, thereby preventing the backflow phenomenon.
Preferably, the laser output cylinder (S7) is vertically downward from the liquid level of the solution in the bubble observing chamber (S8) by 40cm-55cm, and the laser is 90 degrees to the liquid level in the bubble observing chamber (S8). The method aims to realize that the part with the strongest laser beam energy is exactly tangent to the rising bubble, and at the moment, the image capture of the rising bubble is carried out by debugging the proper laser energy and a bright visual field range.
The experiment realized by the display experiment method and the device for coupling the bubble internal flow and the bubble external mass transfer mainly comprises the following steps:
(1) preparing a resazurin solution, a sodium hydroxide solution and a glucose solution with certain concentrations, starting an image processing system (S12) and a laser generator (S5), and connecting a high-speed camera (S11);
(2) opening an air pump (P1) and ventilating air into the bubble observation chamber (S8) through an air valve (V3);
(3) after ventilating for a period of time, slowly injecting the prepared resazurin solution, sodium hydroxide solution and glucose solution into a bubble observation chamber (S8) to a certain liquid level height;
(4) opening a smoke generator (S1) and a smoke valve (V1) to charge smoke into a rectangular mixer (S4), closing the smoke valve (V1) and the smoke generator (S1) after certain smoke is charged, and opening a redundant smoke valve (V2) to discharge redundant smoke to a redundant smoke collector (S3);
(5) closing the redundant smoke valve (V2) and simultaneously opening the oxygen peristaltic pump (P2) to convey oxygen in the oxygen storage tank (S2) to the rectangular mixer (S4), opening the mixed smoke valve (V4) and simultaneously closing the air valve (V3) and the air pump (P1), and enabling smoke to enter bubbles with smoke into the bubble observation chamber (S8) through the buffer chamber (S10) by the bubbling needle (S9);
(6) opening a laser generator (S5), adjusting a laser guide arm (S6) and a laser output cylinder (S7), simultaneously opening a high-speed camera (S11) for image capture, and processing an image by an image processing system (S12);
(7) and (3) closing the laser generator (S5), the high-speed camera (S11) and the image processing system (S12) at the end of the experiment, pouring out the liquid in the bubble observation chamber (S8), and closing the oxygen peristaltic pump (P2) and the mixed smoke valve (V4).
[ advantageous effects ]
Compared with the prior art, the invention mainly has the following beneficial effects:
(1) The experimental device can clearly display the mass transfer phenomenon outside the bubble and the flow phenomenon of fluid inside the bubble.
(2) The preferred rectangular mixer (S4) can well control the concentration of the smoke tracer, improve the controllability of the smoke tracer and greatly increase the definition of the flow phenomenon inside the bubbles.
(3) The air valve (V3) and the mixed smoke valve (V4) are used in a matching way, so that the continuity of rising bubbles is enhanced.
(4) The irradiation position, distance and liquid level height of the laser beam are strictly controlled, and the display definition of the bubble internal flow phenomenon of the rising bubble is enhanced.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a display experiment method and apparatus for coupling bubble internal flow and bubble external mass transfer according to the present invention.
In the figure: the system comprises an S1-smoke generator, an S2-oxygen gas storage tank, an S3-excessive smoke collector, an S4-rectangular mixer, an S5-laser generator, an S6-laser light guide arm, an S7-laser output cylinder, an S8-bubble observation chamber, an S9-bubble blowing needle, an S10-buffer chamber, an S11-high-speed camera, an S12-image processing system, a P1-air pump, a P2-oxygen peristaltic pump, a V1-smoke valve, a V2-excessive smoke valve, a V3-air valve and a V4-mixed smoke valve.
[ detailed description ] A
The invention will be further described with reference to the accompanying drawings.
The first embodiment is as follows:
the invention discloses a display experiment method and a display experiment device for coupling bubble internal flow and bubble external mass transfer, which are used for a laboratory bubble movement parameter measurement experiment.
(1) Preparing a resazurin solution with the concentration of 0.12g/L, a sodium hydroxide solution with the concentration of 0.5g/L and a glucose solution with the concentration of 15g/L, starting a power supply, starting an image processing system (S12) and a laser generator (S5), connecting a high-speed camera (S11) and completing the connection of the PIV device.
(2) And opening the air pump (P1), opening the air valve (V3) after a period of time, and leading the air into the bubble observation chamber (S8) when the valve is in a full-open state.
(3) After a period of aeration, 0.12g/L resazurin solution, 0.5g/L sodium hydroxide solution and 15g/L glucose solution prepared in advance are slowly added into the bubble observation chamber (S8) until the liquid level is 12cm, the liquid bubbling condition is observed, and whether the device has the backflow phenomenon is checked.
(4) And (3) opening a smoke generator (S1) to charge smoke into the rectangular mixer (S4), closing a smoke valve (V1) after dense smoke is filled, opening a redundant smoke valve (V2) to discharge redundant smoke, and controlling the smoke concentration of the rectangular mixer (S4).
(5) Closing the redundant smoke valve (V2), simultaneously opening the oxygen peristaltic pump (P2) and setting the power of the oxygen peristaltic pump, conveying pure oxygen of the oxygen storage tank (S2) into a rectangular mixer (S4) with the side length of 8cm, wherein the diameter of a thin pipe interface is 5mm, opening the mixed smoke valve (V4) and simultaneously closing an air valve (V3), slowly opening the mixed smoke valve (V4), opening the valve until smoke rises in a buffer chamber (S10), and blowing tracer bubbles with smoke with certain concentration into a bubble observation chamber (S8) from a bubbling needle (S9) through the buffer chamber (S10) to enable the rising bubbles to generate continuous smoke lines.
(6) And (2) turning on a laser generator (S5), adjusting proper laser energy until the laser is 90 degrees to the liquid level in the bubble observation chamber (S8), enabling the distance between a laser output cylinder (S7) and the liquid level of the solution in the bubble observation chamber (S8) to be 40cm, simultaneously turning on a high-speed camera (S11) to capture images, and processing and analyzing the obtained images by an image processing system.
(7) At the end of the test, the mixed smoke valve (V4) is closed, 0.12g/L of resazurin solution, 0.5g/L of sodium hydroxide solution and 15g/L of glucose solution are poured out of the bubble observation chamber (S8), then the oxygen peristaltic pump (P2) and the mixed smoke valve (V4) are closed, the laser generator (S5) is closed, the high-speed camera (S11) is closed, and finally the power supply is closed.
Example two:
the invention relates to a display experiment method and a display experiment device for coupling bubble internal flow and bubble external mass transfer, which are used for simulating the movement of bubbles in a bubble tower.
(1) Preparing a resazurin solution with the concentration of 0.8g/L, a sodium hydroxide solution with the concentration of 1.2g/L and a glucose solution with the concentration of 25g/L, starting a power supply, starting an image processing system (S12) and a laser generator (S5), connecting a high-speed camera (S11) and completing the connection of the PIV device.
(2) And opening the air pump (P1), opening the air valve (V3) after a period of time, and leading the air into the bubble observation chamber (S8) when the valve is in a full-open state.
(3) After a period of aeration, a previously prepared resazurin solution with the concentration of 0.8g/L, a 1.2g/L sodium hydroxide solution and a 25g/L glucose solution are slowly added into a bubble observation chamber (S8) until the liquid level is 15cm, the liquid bubbling condition is observed, and whether the device has a backflow phenomenon or not is checked.
(4) And (3) opening the smoke generator (S1) to charge smoke into the rectangular mixer (S4), closing the smoke valve (V1) after filling dense smoke, opening the redundant smoke valve (V2) to discharge redundant smoke, and controlling the smoke concentration of the rectangular mixer (S4).
(5) Closing the redundant smoke valve (V2), simultaneously opening the oxygen peristaltic pump (P2) and setting the power of the oxygen peristaltic pump, conveying pure oxygen of the oxygen storage tank (S2) into a cubic rectangular mixer (S4) with the side length of 10cm, wherein the diameter of a thin pipe interface is 6mm, opening the mixed smoke valve (V4) and simultaneously closing the air valve (V3), slowly opening the mixed smoke valve (V4), opening the valve until smoke rises in the buffer chamber (S10), and blowing tracer bubbles with smoke with certain concentration into the bubble observation chamber (S8) by the bubbling needle (S9) through the buffer chamber (S10) so as to generate continuous smoke lines in the rising bubbles.
(6) And (3) turning on a laser generator (S5), adjusting the proper laser energy until the laser is 90 degrees to the liquid level in the bubble observation chamber (S8), enabling the laser output cylinder (S7) to be 48cm away from the liquid level of the solution in the bubble observation chamber (S8), simultaneously turning on a high-speed camera (S11) for image capture, and processing and analyzing the obtained image by an image processing system.
(7) At the end of the test, the mixed smoke valve (V4) is closed, the resazurin solution with the concentration of 0.8g/L, the sodium hydroxide solution with the concentration of 1.2g/L and the glucose solution with the concentration of 25g/L are poured out from the bubble observation chamber (S8), then the power equipment is closed, the laser generator (S5) is closed, the high-speed camera (S11) is closed, and finally the power supply is closed.
Example three:
the invention relates to a display experiment method and a display experiment device for coupling bubble internal flow and bubble external mass transfer, which are used for simulating the movement of bubbles on a large-diameter rectifying tower plate.
(1) Preparing a resazurin solution with the concentration of 1.2g/L, a sodium hydroxide solution with the concentration of 2.0g/L and a glucose solution with the concentration of 45g/L, starting a power supply, starting an image processing system (S12) and a laser generator (S5), connecting a high-speed camera (S11) and completing the connection of a PIV device.
(2) And opening the air pump (P1), opening the air valve (V3) after a period of time, wherein the valve is in a full-open state at the beginning, and introducing air into the bubble observation chamber (S8).
(3) After a period of ventilation, slowly adding a previously prepared resazurin solution with the concentration of 1.2g/L, a 2.0g/L sodium hydroxide solution and a 45g/L glucose solution into a bubble observation chamber (S8) until the liquid level is 18cm, closing the valve opening of an air valve (V3), observing the liquid bubbling condition and checking whether the device has a backflow phenomenon.
(4) And (3) opening the smoke generator (S1) to charge smoke into the rectangular mixer (S4), closing the smoke valve (V1) after filling dense smoke, opening the redundant smoke valve (V2) to discharge redundant smoke, and controlling the smoke concentration of the rectangular mixer (S4).
(5) Closing the redundant smoke valve (V2), simultaneously opening the oxygen peristaltic pump (P2) and setting the power of the oxygen peristaltic pump, conveying pure oxygen of the oxygen storage tank (S2) into a rectangular mixer (S4) with the side length of 12cm, wherein the diameter of a pipe interface is 8mm, opening the mixed smoke valve (V4) and simultaneously closing an air valve (V3), the mixed smoke valve (V4) is opened completely instantly, a tracer large bubble with smoke with certain concentration is generated in a bubble observation chamber (S8), a continuous smoke line is generated in the rising bubble, and the smoke line generated in the large bubble is observed.
(6) And (3) turning on a laser generator (S5), adjusting the proper laser energy until the laser is 90 degrees to the liquid level in the bubble observation chamber (S8), enabling the laser output cylinder (S7) to be 55cm away from the liquid level of the solution in the bubble observation chamber (S8), simultaneously turning on a high-speed camera (S11) for image capture, and processing and analyzing the obtained image by an image processing system.
(7) At the end of the test, the mixed smoke valve (V4) is closed, the 1.2g/L resazurin solution, the 2.0g/L sodium hydroxide solution and the 45g/L glucose solution are poured out of the bubble observation chamber (S8), then the power equipment is closed, the laser generator (S5) is closed, the high-speed camera (S11) is closed, and finally the power supply is closed.
Claims (6)
1. A display experiment device for coupling bubble internal flow and bubble external mass transfer is characterized by comprising: the device comprises a smoke generator (S1), an oxygen gas storage tank (S2), a surplus smoke collector (S3), a rectangular mixer (S4), a laser generator (S5), a laser light guide arm (S6), a laser output cylinder (S7), a bubble observation chamber (S8), a bubbling needle (S9), a buffer chamber (S10), a high-speed camera (S11), an image processing system (S12), an air pump (P1), an oxygen peristaltic pump (P2), a smoke valve (V1), a surplus smoke valve (V2), an air valve (V3) and a mixed smoke valve (V4); an air pump (P1) is connected with a bubble observation chamber (S8) through an air valve (V3), a buffer chamber (S10) and a bubbling needle (S9) in sequence to introduce air into the bubble observation chamber (S8), the bubble observation chamber (S8) is filled with a resazurin solution, a sodium hydroxide solution and a glucose solution which are prepared at a certain liquid level height, a smoke generator (S1) is connected with a rectangular mixer (S4) through a smoke valve (V1) to introduce a smoke tracer into the rectangular mixer (S4), fine tube interfaces on four surfaces of the rectangular mixer (S4) are respectively connected with the smoke valve (V1), an oxygen peristaltic pump (P2), an excess smoke valve (V2) and a mixed smoke valve (V4), the excess smoke valve (V2) is connected with an excess smoke collector (S3) to introduce excess smoke in the rectangular mixer (S4) into the excess smoke collector (S3), the oxygen pump (P2) is connected with an oxygen storage tank (S2) to convey oxygen into the rectangular mixer (S4), the mixed smoke valve (V4) is sequentially connected with the buffer chamber (S10), the bubbling needle (S9) and the bubble observation chamber (S8), the laser generator (S5) is sequentially connected with the laser light guide arm (S6) and the laser output cylinder (S7) so that laser vertically irradiates the bubble observation chamber (S8) downwards, and the high-speed camera (S11) is connected with the image processing system (S12) to capture and process images.
2. A display experimental apparatus for coupling bubble internal flow with bubble external mass transfer according to claim 1, characterized in that: the concentration range of the prepared resazurin solution is 0.12-1.2 g/L, the concentration range of the sodium hydroxide solution is 0.5-2.0 g/L, and the concentration range of the glucose solution is 15-45 g/L.
3. A display experiment apparatus for coupling gas bubble internal flow with mass transfer outside the bubble according to claim 1, wherein: the side length of the rectangular mixer (S4) is 8cm-12cm, four surfaces of the rectangular mixer are connected with four thin tube interfaces, and the tube diameters of the thin tube interfaces are 5mm-8mm.
4. A display experimental apparatus for coupling bubble internal flow with bubble external mass transfer according to claim 1, characterized in that: the liquid level height of the liquid injected into the bubble observing chamber (S8) is 12cm-18cm.
5. A display experiment apparatus for coupling gas bubble internal flow with mass transfer outside the bubble according to claim 1, wherein: the laser output cylinder (S7) is vertically downward 40-55 cm away from the liquid level of the solution in the bubble observation chamber (S8), and the laser forms an angle of 90 degrees with the liquid level in the bubble observation chamber (S8).
6. A method of conducting experiments using the display experimental apparatus for coupling gas bubble internal flow with mass transfer outside the bubble of claim 1, comprising the steps of:
(1) preparing a resazurin solution, a sodium hydroxide solution and a glucose solution with certain concentrations, starting an image processing system (S12) and a laser generator (S5), and connecting a high-speed camera (S11);
(2) opening an air pump (P1) and ventilating air into the bubble observation chamber (S8) through an air valve (V3);
(3) after ventilating for a period of time, slowly injecting the prepared resazurin solution, sodium hydroxide solution and glucose solution into a bubble observation chamber (S8) to a certain liquid level height;
(4) opening a smoke generator (S1) and a smoke valve (V1) to charge smoke into a rectangular mixer (S4), closing the smoke valve (V1) and the smoke generator (S1) after certain smoke is charged, and opening a redundant smoke valve (V2) to discharge redundant smoke to a redundant smoke collector (S3);
(5) closing the redundant smoke valve (V2), simultaneously opening the oxygen peristaltic pump (P2) to convey oxygen in the oxygen storage tank (S2) to the rectangular mixer (S4), opening the mixed smoke valve (V4), simultaneously closing the air valve (V3) and the air pump (P1), and allowing smoke to pass through the buffer chamber (S10) and enter bubbles with smoke into the bubble observation chamber (S8) through the bubbling needle (S9);
(6) opening a laser generator (S5), adjusting a laser guide arm (S6) and a laser output cylinder (S7), simultaneously opening a high-speed camera (S11) for image capture, and performing image processing by an image processing system (S12);
(7) and (3) closing the laser generator (S5), the high-speed camera (S11) and the image processing system (S12) at the end of the experiment, pouring out the liquid in the bubble observation chamber (S8), and closing the oxygen peristaltic pump (P2) and the mixed smoke valve (V4).
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