MAGNETORHEOLOGICAL CONTROL OF HEAT-TRANSFER

Results of experimental investigation of the effect of magnetic fields on thermal processes taking place in magnetorheological suspensions (MRS) are presented. It is shown that by varying the orientation and strength of the field it is possible to control heat transfer within a wide range. Anisotropy of the thermal conductivity of MRS is established. In the case of the field lines being co-directional with a heat flux, the thermal conductivity coefficient increases by about 70%, whereas with their normal relative orientation it decreases by about 50%. The effect of a rotating magnetic field on MRS shear flow in a gap causes an almost 15-fold enhancement of heat transfer. Heat transfer of a turbulent suspension flow in a channel is intensified by an order of magnitude on superposition of a homogeneous field, transversely to the channel axis, and is suppressed twice as much in the case of parallel orientation. Examples and recommendation for practical application of the regularities revealed are given.