HEAT-TRANSFER FROM AN IMMERSED SURFACE IN A MAGNETOFLUIDIZED BED

Heat Transfer from an immersed horizontal cylindrical heat-transfer pr obe in an air-fluidized bed of iron shots exposed to an external magne tic field has been investigated. The probe is equipped to provide both total and local heat-transfer coefficients at different axial and ang ular positions. The fluidizing-air velocity and external magnetic-fiel d intensities are varied to bring about different fluidization regimes starting from fixed-bed, magnetically stabilized-bed, partially stabi lized- or bubbling-bed, and frozen-bed regimes. The nature of heat tra nsfer is interpreted in all these regimes and conditions are identifie d where advantages of magnetic bed stabilization can be enjoyed withou t loss of heat-transfer rates.