Title: Numerical investigation on gas flow and pressure drop for 90° rectangular ventilation bends in low Reynolds number

Authors: Bingtao Zhao, Zhongxiao Zhang, Jing Jin

Addresses: College of Power Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, PR China. ' College of Power Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, PR China. ' College of Power Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, PR China

Abstract: The gas flow and Pressure Drop Coefficient (PDC) for 90° rectangular ventilation bends in low Reynolds number are investigated by numerical simulation. The different geometrical dimensions and operational conditions with normalised experimental design, including 1/2, 1/1 and 2/1 of the width height ratio b/a, 1/4, 1/2 and 1/1 of the curvature ratio b/R, and 0.1 × 10⁵, 0.5 × 10⁵, and 1.0 × 10⁵ of the Reynolds number Re, are employed to model bends, respectively. The results indicate that b/a, b/R and Re play an important role on flow pattern and pressure drop. Finally, based on the computational data, a useful semi-empirical correlation is obtained to describe the PDC performance by multiple regression method.

Keywords: PDC; pressure drop coefficient; rectangular ventilation bends; Reynolds number; numerical simulation; gas flow.

DOI: 10.1504/IJETP.2008.020744

International Journal of Energy Technology and Policy, 2008 Vol.6 No.5/6, pp.581 - 589

Published online: 13 Oct 2008 *

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