CN112129759A - Method for judging injectability of soybean protein liquid based on PIV technology - Google Patents
Method for judging injectability of soybean protein liquid based on PIV technology Download PDFInfo
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- CN112129759A CN112129759A CN202011014452.7A CN202011014452A CN112129759A CN 112129759 A CN112129759 A CN 112129759A CN 202011014452 A CN202011014452 A CN 202011014452A CN 112129759 A CN112129759 A CN 112129759A
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- 108010073771 Soybean Proteins Proteins 0.000 title claims abstract description 61
- 239000007788 liquid Substances 0.000 title claims abstract description 59
- 235000019710 soybean protein Nutrition 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005516 engineering process Methods 0.000 title claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 62
- 238000005507 spraying Methods 0.000 claims abstract description 53
- 239000007921 spray Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 6
- 238000000889 atomisation Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000000917 particle-image velocimetry Methods 0.000 description 14
- 229940001941 soy protein Drugs 0.000 description 8
- 235000013311 vegetables Nutrition 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 239000007888 film coating Substances 0.000 description 4
- 238000009501 film coating Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- G01N21/85—Investigating moving fluids or granular solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
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- Physics & Mathematics (AREA)
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- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Aviation & Aerospace Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Multimedia (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Peptides Or Proteins (AREA)
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- Beans For Foods Or Fodder (AREA)
Abstract
The invention discloses a method for judging the sprayability of soybean protein liquid based on a PIV technology. The method can qualitatively and quantitatively analyze the sprayability of the soybean protein liquid with different concentrations under different spraying parameters based on the principle that the particle has speed, or vice versa, the particle does not have speed and the particle does not have speed. The method for judging the sprayability of the soybean protein liquid based on the PIV technology can provide powerful test data reference for obtaining uniform and consistent spraying, and provides theoretical and practical basis for further obtaining high-quality film covering.
Description
Technical Field
The invention relates to the field of material forming, in particular to a method for applying a PIV (particle image velocimetry) technology to detection of the sprayability of soybean protein liquid, aiming at the spraying and coating of the soybean protein liquid.
Background
The isolated soy protein has the advantages of low price, biodegradability, easy film forming property and the like, and is gradually concerned by researchers in various countries in the world. The pure vegetable paper serving as a packaging material cannot meet the requirement of heat sealing performance, and the pure vegetable paper serving as a base material is further processed to prepare the vegetable composite paper meeting the requirement of heat sealing performance, and the soybean protein liquid is sprayed to form a uniform soybean protein film on the surface of the vegetable paper to prepare the vegetable composite paper meeting the requirement of heat sealing performance. In the film-coating forming process, the sprayability of the soybean protein liquid is one of factors influencing the film-coating quality, and the soybean protein liquid with poor sprayability can have the problems of nozzle blockage, uneven spraying, incomplete liquid drop atomization and the like during spraying, so that the consequences of poor film-coating quality, raw material waste, low spraying efficiency and the like are caused.
Disclosure of Invention
In order to solve the problems, the invention provides a method for detecting the jettability of soybean protein liquid based on a PIV technology, so as to rapidly detect the jettability of liquid with different parameters and find out the optimal spraying parameters.
The technical scheme adopted by the invention is as follows: a method of liquid jettability detection based on PIV technology, the detection method comprising the steps of:
the first step is as follows: qualitative determination of soybean protein liquid jettability based on PIV velocity field image appearance
Qualitatively judging the jettability of the soybean protein liquid based on the appearance of the PIV velocity field image: firstly, setting the spraying parameters as follows: spraying parameters, namely spraying flow rate of 40cc/min, spraying pressure of 0.20MPa, spraying hydraulic pressure of 0.12MPa and constant nozzle electronic pulse frequency of 80 Hz; soybean protein liquids with mass percentage concentrations of 4.67%, 7.27% and 9.73% are prepared respectively, then atomized and sprayed by water according to set spraying parameters, shot by a PIV system, and processed by Tecplot software to obtain a speed field picture.
The atomized particle velocity fields of the soy protein liquid and water of different concentrations were selected for comparison, and water was a blank control group with a more complete and substantially symmetrical velocity field appearance, with no intermittent spray areas and central holes. According to the principle that particles exist at the speed and particles do not exist at the speed, the water spraying property can be judged qualitatively and is better. If the soybean protein liquid spray particle velocity field image has the phenomena of non-uniformity, discontinuity, holes and the like, qualitative judgment is indicated, and the soybean protein liquid under the concentration has poor sprayability under the spraying parameters.
The second step is that: quantitative determination of jettability based on the presence or absence of velocity on image sectional line of PIV velocity field
According to the actual situation, a horizontal plane with a certain distance from the nozzle is selected as a base line, the distance between the coated surface and the nozzle is measured to be 30cm, therefore, the horizontal plane with the same distance from the nozzle is selected as a spraying base line on the image, a soybean protein liquid spraying atomized particle speed field image is selected, two lines of the spraying base line and the axial direction of the nozzle are marked, and a Tecplot software is used for extracting and processing the two lines to form a curve graph of the speed and the distance on the two lines.
According to the principle that particles exist at the speed and particles do not exist at the speed, the point on the baseline and the axis where the speed value of the curve graph is 0 can be judged that no particles exist at the point, and the soybean protein liquid spraying under the concentration and the spraying parameters can be quantitatively judged to have poor spraying property.
The novel method for detecting jettability has the advantages that:
1. the method is based on digital image processing, and can quickly and accurately define the jettability of the soybean protein liquid with any concentration.
2. The method can qualitatively and quantitatively define the jettability of different liquids.
3. The method is a non-contact detection method and does not pollute the detected object.
The method analyzes the appearance of the PIV particle velocity field image to qualitatively judge the sprayability and quantitatively judges the sprayability based on the existence of the velocity on the PIV sectional line, lays a foundation for selecting the soybean protein liquid with proper concentration in the later film coating stage, and obviously improves the packaging performance of the vegetable composite paper.
Drawings
FIG. 1 is a water spray atomized particle velocity field plot;
FIG. 2 is a graph of the velocity field of spray particles of a low concentration (4.67%) soy protein liquid;
FIG. 3 is a graph of the velocity field of medium concentration (7.27%) soy protein liquid spray particles;
FIG. 4 is a graph of the velocity field of high concentration (7.27%) soy protein liquid spray particles;
FIG. 5 is a sectional view of the velocity field of a high concentration (9.73%) soybean protein liquid spray particle;
FIG. 6 is a graph showing the axial variation of the velocity field of medium-concentration (7.27%) soybean protein liquid;
FIG. 7 is a graph showing the axial variation of the velocity field of a highly concentrated (9.73%) soybean protein liquid;
FIG. 8 is a graph showing the radial variation of the velocity field of medium concentration (9.73%) soybean protein liquid;
FIG. 9 is a graph showing the radial variation of the velocity field of a high concentration (9.73%) soybean protein liquid.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to a method for judging the jettability of soybean protein liquid based on a PIV technology, which comprises the following steps:
the first step is as follows: according to the experimental design requirements, setting the spraying parameters as follows: spraying flow, spraying air pressure, spraying hydraulic pressure and nozzle electronic pulse frequency; spray experiments were performed using equal amounts of water as a control; and then, according to the actual situation, a test scheme is made, and the soybean protein liquid with different concentrations is prepared according to the test scheme. The images of the atomized particle velocity fields of water and different soybean protein liquids were obtained by shooting with a PIV apparatus and processed with Tecplot software to obtain velocity field images.
And (3) taking the atomized particle velocity field of the water as a reference object, and qualitatively judging the sprayability of the soybean protein liquid under the spraying parameters and concentration according to whether the velocity field image is continuous and uniform and has no holes.
The second step is that: and selecting the acquired soybean protein liquid spray atomized particle velocity field image, extracting a spray baseline (the length of the baseline is selected according to actual conditions) and the velocity in the axial direction of the nozzle by using Tecplot software, and processing to obtain a velocity and distance curve chart.
According to the principle that the particle exists at the speed and the particle does not exist at the speed, the point with the speed value of 0 on the base line has no particle, namely the spraying has defects, and then the uneven spraying and atomization of the soybean protein liquid under the concentration and the spraying parameters can be quantitatively judged, and the sprayability is poor.
The following is further illustrated by the specific examples:
example 1
Setting spraying parameter spraying flow 40cc/min
The spraying air pressure is 0.20MPa
The spraying hydraulic pressure is 0.12MPa
The constant nozzle electron pulse frequency was 80 Hz.
The method comprises the following steps:
(1) the method comprises the steps of changing the quality of soybean protein by constant 800g of distilled water and the same amount of additives (see table 1) to obtain different concentrations of soybean protein liquid, measuring the speed field condition of atomized particles under different concentrations of the soybean protein liquid by using a PIV device, designing a test scheme according to Design Expert software, selecting four groups of tests from the scheme for comparative analysis, wherein the four groups of tests are respectively high concentration, medium concentration and low concentration, and water (comparison) the table 1 is used as the test scheme, and the concentration of the soybean protein liquid refers to the mass fraction of the soybean protein.
TABLE 1 Experimental protocols
(2) To analyze the sprayability of the soy protein fluid, the velocity fields of the atomized particles were selected to compare low, medium, and high concentration soy protein fluid to that of water, which is a blank control. FIG. 1 is a velocity field of atomized particles of water at a spray flow of 40cc/min, a spray pressure of 0.20MPa, and a spray fluid pressure of 0.12MPa, showing in the image that the water has good spray characteristics, a more complete and substantially symmetrical velocity field appearance, and no intermittent spray zones; the velocity of the atomized particles sprayed out on the central axis of the nozzle of the spray head tends to increase rapidly and then decrease gradually, and no velocity-free region is formed inside the velocity field.
(3) Fig. 2 is the velocity field of the atomized particles of the soybean protein liquid with a low concentration of 4.67% under the set parameters of the experiment, while fig. 3 is the velocity field of the atomized particles of the soybean protein liquid with a medium concentration of 7.27%, it is obvious from both images that the spray fields are both close to symmetrically distributed fan-shaped surfaces, the velocity of the central axis of the spray head and the position close to the spray head is relatively high, and the spray state is continuous without interruption, and compared with the appearance of the velocity field of the water spray of fig. 1, the fan-shaped surfaces are all shrunk, and the shrinkage of the low concentration is relatively small compared with the shrinkage of the medium concentration.
FIG. 4 is a velocity field state of atomized particles in a soy protein liquid with a high concentration of 9.73%, wherein the atomization characteristic of the concentration in the image is inferior to that of the two concentrations in FIGS. 2 and 3, the sector formed by the atomized particle field is also incomplete, and the velocity field has an interrupted region to form an island-like shape; it can also be seen from the different colour regions in the image that no velocity regions are present within the particle velocity field. Therefore, the concentration is too high, the soybean protein liquid is easy to block the nozzle, the speed field has a discontinuous area, and the atomization characteristic is poor, namely the sprayability of the soybean protein liquid under the concentration is poor.
(4) After the test device is debugged, the size of the spray field is calibrated, the magnification is determined, the velocity magnification obtained after the system calibration is 0.6619m/s.pixel, the image magnification is 0.33099mm/pixel, then test spraying is carried out, and in order to avoid the influence of the spraying instantaneity on certain atomizing characteristics, 20 original images of the particle velocity field are continuously measured in each group in the test. And processing the measured 20 original images into average images of the particle velocity field, and performing post-processing on the average images by using tecplot software to obtain the velocity field of each group of test spray particles and the change condition of the particle velocity at the section with the axial distance of 300mm and on the central axis of the nozzle. FIG. 5 is a sectional view of the atomized particle velocity field of soybean protein liquid with a high concentration of 9.73%, wherein the sectional line is the section with an image axial distance of 300mm, and the sectional line is the central axis of the nozzle. Velocity data on the two sectional lines are respectively extracted by the technicot software and processed to make velocity and distance graphs.
(5) Fig. 6 and 7 show the variation of particle velocity field in the central axis of the nozzle, i.e., the variation of particle velocity in the axial distance, for the atomized particles of the soybean protein liquid having the concentration of 7.27% and 9.73%, respectively, under the above conditions. From figure 6 it can be seen that the velocity on the axis of the nozzle increases rapidly after ejection from the orifice and then decreases rapidly, and that the particle velocity is not zero at axial distances of 60-670mm, and the nozzle coordinate (335,670) has a particle velocity, so that it can be seen that the atomized particles are present continuously and uninterrupted from the nozzle ejection to the downstream of the spray. The particle velocity variation trend of fig. 7 is substantially the same as that of fig. 6, but the particle velocity of fig. 7 is significantly lower than that of fig. 6, and the velocity is almost zero at the axial distance of 0-230mm and 670mm of 620-.
Fig. 8 and 9 are the particle velocity field changes at a cross section with an image axial distance of 300mm, i.e., the particle velocity changes over a radial distance, for the atomized particles of the soybean protein liquid with the concentrations of 7.27% and 9.73%, respectively, under the above conditions. Fig. 8 shows that the velocity is the maximum at the axial center at the fixed cross section, the particle velocity at the outer edge of the velocity field is gradually reduced, the velocity is not zero at the radial distance of 0-670mm, the velocity curve is continuous without interruption, while the particle velocity variation in fig. 9 is different from the trend of fig. 8, the velocity curve is discontinuous with interruption, the particle velocity is zero at the radial distances of 120-260mm and 440-670mm, no particle is present, which indicates that there are no particles in the two regions, and there is a discontinuous region in the spray particle field.
By synthesizing the speed change conditions in the axial and radial distances, the spraying of the soybean protein liquid with the concentration of 9.73 percent is interrupted, the nozzle is easy to block, and the spraying property is poor.
The foregoing is a more detailed description of the present invention with reference to specific embodiments thereof, and it is not to be construed as limiting the invention to the specific embodiments described above. Numerous other simplifications or substitutions may be made without departing from the spirit of the invention as defined in the claims and the general concept thereof, which shall be construed to be within the scope of the invention.
Claims (1)
1. A method for judging the sprayability of soybean protein liquid based on PIV technology is characterized in that: the method comprises the following steps:
the first step is as follows: qualitatively judging the jettability of the soybean protein liquid based on the appearance of the PIV velocity field image: firstly, setting the spraying parameters as follows: spraying parameters, namely spraying flow rate of 40cc/min, spraying pressure of 0.20MPa, spraying hydraulic pressure of 0.12MPa and constant nozzle electronic pulse frequency of 80 Hz; respectively preparing soybean protein liquid with the mass percentage concentration of 4.67%, 7.27% and 9.73%, then carrying out atomization spraying on water according to set spraying parameters, shooting by using a PIV system, and obtaining a speed field picture after processing by Tecplot software;
selecting the soybean protein liquid with different concentrations to compare with the atomized particle velocity field of water, wherein the water is a blank control group, has relatively complete and basically symmetrical velocity field appearance and has no discontinuous spraying area and central hole; according to the principle that particles exist at a certain speed and particles do not exist at a certain speed, the water spraying property can be judged qualitatively, and the water spraying property is good; if the soybean protein liquid spray particle velocity field image has the phenomena of unevenness, discontinuity and holes, qualitative judgment can be carried out, and the soybean protein liquid under the concentration has poor sprayability under the spraying parameters;
the second step is that: jettability is quantitatively determined based on the presence or absence of velocity on the image sectional line of the PIV velocity field: measuring the distance between the coated surface and the nozzle to be 30cm, selecting a horizontal plane with the same distance from the nozzle on the image as a spraying base line, selecting a soybean protein liquid spraying atomized particle velocity field image, marking two lines of the spraying base line and the axial direction of the nozzle, extracting and processing by using Tecplot software, and making a curve graph of the velocity and the distance on the two lines;
according to the principle that particles exist at the speed and particles do not exist at the speed, the point on the baseline and the axis where the speed value of the curve graph is 0 can be judged that no particles exist at the point, and the poor spraying property of the soybean protein liquid under the concentration and the spraying parameters can be quantitatively judged.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007197879A (en) * | 2006-01-30 | 2007-08-09 | Daio Paper Corp | Coated paper |
| CN102632737A (en) * | 2011-02-10 | 2012-08-15 | 佳能株式会社 | Ink jet recording medium |
| US20170131200A1 (en) * | 2014-06-15 | 2017-05-11 | The State of Israel, Ministry of Agriculture & Rural Development Agricultural Research Organizati | Method for huanglongbing (hlb) detection |
| CN108760368A (en) * | 2018-05-30 | 2018-11-06 | 内蒙古科技大学 | The judgment method of aerial fog nozzle typical operation conditions |
-
2020
- 2020-09-24 CN CN202011014452.7A patent/CN112129759A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007197879A (en) * | 2006-01-30 | 2007-08-09 | Daio Paper Corp | Coated paper |
| CN102632737A (en) * | 2011-02-10 | 2012-08-15 | 佳能株式会社 | Ink jet recording medium |
| US20170131200A1 (en) * | 2014-06-15 | 2017-05-11 | The State of Israel, Ministry of Agriculture & Rural Development Agricultural Research Organizati | Method for huanglongbing (hlb) detection |
| CN108760368A (en) * | 2018-05-30 | 2018-11-06 | 内蒙古科技大学 | The judgment method of aerial fog nozzle typical operation conditions |
Non-Patent Citations (1)
| Title |
|---|
| 任少伟: "大豆蛋白液流变学特性与喷涂雾化场特征关系研究", 《工程科技Ⅰ辑》, no. 07, pages 1 - 51 * |
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Application publication date: 20201225 |