Convection heat transfer in baffled mixing tank

Abstract

Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.Single -phase flow field and temperature distribution in a baffled tank stirred by a three- bladed impeller was investigated both computationally and experimentally. The computational model employed a sliding mesh technique in fully three-dimensional grids for a smallscale unit, in which also velocity and heat transfer measurements were made with water. Turbulence effects were simulated using the standard k-ε model. Two different boundary conditions, namely, constant heat flux and constant temperature on the wall were used for heat transfer simulations. Mean velocity and turbulence were measured using LDA. In temperature measurements thermocouples were used. By comparing experimental and modelled results nondimensional variables of velocity were found, which gave very similar results to the pilot unit and full- size reactor of 12 m3, for which some modelled heat transfer results are given.