Abstract
An instrumented cylinder which contains an abrasion resistant, fast responding (settling time of approximately 2 ms) heat flux transducer, along with associated analog signal conditioning equipment, is developed for the measurement of instantaneous local heat transfer rates to an immersed horizontal cylinder in a high temperature fluidized bed. Analog signal conditioning is used to provide a d.c. voltage which is linearly related to the instantaneous local heat flux. This voltage is suitable for direct oscillographic recording or digital data acquisition. Instantaneous local heat transfer coefficient data obtained in a 30 × 60 cm cross section high temperature fluidized bed of 0.9 mm mean diameter particles at 562°C are presented. Spatially-averaged heat transfer coefficient data, obtained using the instrumented cylinder in fluidized beds with temperatures up to 743°C, are in very good agreement with published correlations.
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