EFFECT OF NEAR-WALL MODELING ON PREDICTION OF IMPINGEMENT HEAT-TRANSFER

被引:6
|
作者
POLAT, S
MUJUMDAR, AS
VANHEININGEN, ARP
DOUGLAS, WJM
机构
[1] Chemical Engineering Department, Pulp and Paper Research Centre, McGill University, Montreal, H3A 2A7
关键词
D O I
10.1080/07373939008959911
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Due to enhanced transport characteristics, impinging jets are widely used in industry to dry large surface area products such as paper and textiles. The present numerical study concerns the modelling of convective heat transfer for impingement drying. Flow and heat transfer under a confined two dimensional turbulent air jet impinging on a flat surface were modelled by solution of two-dimensional Navier-Stokes and energy equations. The turbulence model used was the high-Re number version of the well known two-equation (k-e) model and numerical solution was by the upwind finite difference scheme. The specific objective was to evaluate the accuracy of schemes for modelling the near-wall turbulent flow. The mean flow properties such as centerline velocity decay and the pressure distribution at the impingement surface show no dependence on the near-wall model used. Heat transfer predictions were found to be quite sensitive to the choice of near-wall model. Best agreement between predictions and experiments was obtained for a Chieng-Launder type model with a new modification, use of kp instead of k, in the calculation of Tw. © 1990, Taylor & Francis Group, LLC. All rights reserved.
引用
收藏
页码:705 / 730
页数:26
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