文档介绍：Cryogenics 44 (2004) 823–831
ate/cryogenics
Study of flow distribution and its improvement on the header of
plate-fin heat exchanger
Jian Wen *, Yanzhong Li *
Department of Refrigeration and Cryogenics Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Received 25 November 2003; received in revised form 19 March 2004; accepted 30 April 2004
Abstract
In order to enhance the uniformity of flow distribution, an improved header configuration of plate-fin heat exchanger is put
forward in this paper. Based on the analysis of the fluid flow maldistribution for the conventional header used in industry, a baffle
with small holes of three different kinds of diameters is mended to install in the header. The flow maldistribution parameter S
is obtained under different header configuration. When the baffle is properly installed with an optimum length, with stagger arranged
and suitably distributed holes from axial line to baffle boundary, the ratio of the maximum flow velocity to the minimum flow
velocity drops from – to – for various Reynolds numbers. The numerical results indicate that the improved header
configuration can effectively improve the performance. The conclusion of this paper is of great significance in the improvement of
plate-fin heat exchanger.
Ó 2004 Elsevier Ltd. All rights reserved.
Keywords: Plate-fin heat