Determination of Fluid-particle Convective Heat Transfer Coefficient

Abstract

Fluid-to-particle convective heat transfer coefficient (hfp) was determined by continuous particle center temperature measurements in a hold tube by a temperature sensor system using the transmitter particle technique. The fluid used was carboxy methyl cellulose (CMC) at concentrations of 0.5, 1.0, and 1.2% (w/w). The carrier fluid temperatures were 22.22, 65.56, 76.67, and 82.22 C. Temperature dependent viscosity parameters of CMC were determined and used in calculating hfp. Specific heat and thermal resistance of the sensor were experimentally determined and used in solving the energy balance equation to obtain hfp values. Values of hfp ranged from 108.08 to 195.83 W/m2 C. The results are expressed as a correlation of dimensionless numbers. The fluid viscosity significantly affected hfp at high temperatures. Decreasing fluid viscosity (by increasing fluid temperatures) increased hfp.