Chinese Journal of Theoretical and Applied Mechani ›› 2010, Vol. 42 ›› Issue (6): 1006-1012.DOI: 10.6052/0459-1879-2010-6-lxxb2009-222

• Research paper • Previous Articles     Next Articles

Experimental study on the frictional pressure drop of water flow in mini-channels with circular cylinder disturbed flow

Liu Dong, ,Wang Yaqing,Xu Kan   

  1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, HeFei 230027, China
  • Received:2009-04-13 Revised:2010-03-30 Online:2010-12-10 Published:2010-12-02

Abstract: Using water as working fluid, the pressure drops for mini-channel radiator with different height/width ratios involved with circular disturbed flow before or behind the mini-channels were experimentally studied. It is found that the pressure drop increases linearly with the Reynolds Number. A general empirical formula was proposed to consider pressure drop as function of Reynolds Number, hydrodynamic diameter and height/width ratio. The formula can predict flow friction of the similar system well. For line-wear mini-channels, the flow friction coefficient is inversely proportional to Reynolds number, and the value is larger than that of circle tube. The experimental results indicate that the surface roughness is the main impact factor for pressure drop. However, the circular cylinder disturbed flow has little influence on it. It is found that the circular cylinder disturbed flow which set in the front of mini-channel can enlarge the heat dissipation.

Key words: flow friction

CLC Number: