Heat transfer from an immersed surface in a magnetofluidized bed

Abstract

Heat Transfer from an immersed horizontal cylindrical heat-transfer probe in an air-fluidized bed of iron shots exposed to an external magnetic field has been investigated. The probe is equipped to provide both total and local heat-transfer coefficients at different axial and angular positions. The fluidizing-air velocity and external magnetic-field intensities are varied to bring about different fluidization regimes starting from fixed-bed, magnetically stabilized-bed, partially stabilized-or bubbling-bed, and frozen-bed regimes. The nature of heat transfer is interpreted in all these regimes and conditions are identified where advantages of magnetic bed stabilization can be enjoyed without loss of heat-transfer rates.