HEAT TRANSFER FROM A HORIZONTAL TUBE IN A MAGNETOFLUIDIZED BED

摘要

Heat transfer coefficient values are reported for a horizontal Nylon 24.1 mm diameter heated probe immersed in an iron shot bed of 1511 mu m average diameter and exposed to an external uniform magnetic field collinear with the fluidizing air velocity. The electromagnet produces a maximum constant magnetic-field intensity of 27,850 A/m in a cylindrical central region, 152.4 mm in diameter and 152.4 mm in height, within a constancy of 1%. Total and local heat transfer coefficients are measured at different axial and angular positions over a range of air velocity (0.28-2.50 m/s) and magnetic-field intensity (0.0-19,974 A/m) values. The bed is also characterized by its hydrodynamic properties, viz., minimum fluidization and bubbling velocities and mean bed voidage. [References: 4]