Influence of particle-particle, interactions of fluid-to-particle heattransfer coefficients (h(fp)) under tube flow conditions using stationaryparticle technique

摘要

Fluid-to-particle heat transfer coefficients (h(fp)) were determined experimentally during flow of fluid over one or more particles using "stationary particle technique". The effects of different process parameters (e.g., particle-particle interaction, carrier fluid viscosity, carrier fluid temperature and flow rate) on h(fp) were quantified. The h(fp) value for the sample particle (silicone sphere) decreased by 5-20%, when another particle at different orientations (0 degrees, 30 degrees, 45 degrees and 60 degrees) was introduced upstream, whereas h(fp) values increased by 14%, when multiple particles were introduced upstream of the sample particle (flow rate = 5.2 x 10(-4)m(3)/s and fluid temperature = 73.6 degreesC). The h(fp) value decreased three-folds with an increase in carrier fluid viscosity from 0.4 x 10(-3) to 33.3 x 10(-3) Pa.s. The h(fp) values increased four- and two-folds with an increase in carrier fluid temperature (from 60 degrees to 80 degrees) and flow rate (from 0.27 10(-3) to 2.82 x 10(-3)m(3)/s), respectively.