Abstract
Amethodology was developed to measure the
bulk average heat transfer coefficient of a large number of particles flowing in a holding tube. This technique is based on energy balance on the fluid and the analytical solution of transient heat conduction within a sphere. Particles at concentrations up to 18% v/v and fluid, at different initial temperatures, were mixed while flowing in the holding tube. The range of measured heat transfer coefficient (
h
fp
) was from 180 to 800Wm−
2 2 K, based on particle concentration and flow rate. The value of
h
fp
was found to decrease significantly as the particle concentration increased. This could be attributed to the restriction of particle movement in the holding tube as the particle concentration increased. Although bulk flow rate, as expected, was found to increase
h
fp
, the increase was not significant at all levels.