HEAT TRANSFER COEFFICIENT BETWEEN HEATING WALL AND AGITATED GRANULAR BED.

Abstract

The heat transfer coefficient between the heating wall and the mechanically agitated granular bed in small indirect-heat agitated dryer was measured. There is a clearance between the wall and the agitator blades in this type of the dryer. The effect of this clearance on the heat transfer is very significant. Based on 'the particle heat transfer model' suggested by Schluender and partly revised by Mollekopf and Martin, the heat transfer model in which the effect of the clearance was considered was proposed to correlate the observed heat transfer coefficients. The comparison between the experimental and the calculated heat transfer coefficients showed no serious deviation.