Measurement of heat transfer coefficients using stationary and moving particles in tube flow.

摘要

Design of thermal processes for particulate foods depends strongly on values of fluid-to-particle heat transfer coeff. (hfp) as well as on heat penetration and particulate flow data during continuous processes. Stationary and moving thermocouple experimental techniques were used to simulate the heat transfer between a fluid and a particle in tube flow using water and carboxymethylcellulose solutions. Fluid viscosity significantly affected hfp, with increasing fluid viscosity causing hfp values todecrease. An increase in particle size within the tube flow icreased hfp; particle shape had little effect on hfp. A dimensionless Nusselt correlation was also obtained in terms of generalized Reynolds and Prandtl numbers for both Newtonian and non-Newtonian fluids. Correlation showed strong agreement with experimental values and other models published in literature