GB1353556A - Method and device for magnetohydrodynamically controlling the flow rate of an electrically conductive liquid - Google Patents

Abstract

1353556 Fluid regulation INSTITUT FIZIKI AKADEMII NAUK LATVIISKOI SSR 15 Nov 1971 52983/71 Heading G3H The flow-rate of an electrically conductive liquid flowing between the poles of a magnetic system is controlled by establishing along the liquid flow, regions having different values of induced e.m.f. In the apparatus shown in Fig. 1, the liquid passes along a pipe 1 disposed between two toothed poles, the teeth of the poles being aligned so that the voltage induced in the liquid between two teeth has a value different from that induced in the liquid between two inter-teeth slots. Large circulating currents are set up in the liquid It is stated that these currents cause substantial heat loss, thereby affecting the flow-rate. Adjustment of the flux density alters the flow-rate. One of the poles may be constructed to permit adjustment of the depth of the inter-teeth slots, Fig. 2 (not shown). Windings may be placed in the slots, variation of the winding current varying the liquid flow-rate. Control of the flow-rate may be achieved by establishing along the flow, regions having different velocity. Thus in the apparatus of Fig.4., the duct 10 containing the liquid has alternating widenings and contractions. Where the liquid is metal, the widenings are preferably filled with inserts of the same metal, Fig. 6 (not shown). Alternatively or, in addition, the duct may have a cooling jacket 13, Fig. 7 (not shown). In a further modification, Fig. 8 (not shown), the duct for the liquid is of rectangular crosssection, the two walls parallel to the poles of the magnetic system being of electrically conductive material and the remaining two walls having alternate conductive and non-conductive segments.