Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8690
Title: Experimental study of developing turbulent flow and heat transfer in ribbed convergent/divergent square ducts
Authors: Wang, LB
Tao, WQ
Wang, QW
Wong, TT
Issue Date: 2001
Publisher: Elsevier
Source: International journal of heat and fluid flow, 2001, v. 22, no. 6, p. 603-613 How to cite?
Journal: International journal of heat and fluid flow 
Abstract: The local heat transfer and pressure drop characteristics of developing turbulent flows of air in three stationary ribbed square ducts have been investigated experimentally. These are: ribbed square duct with constant cross-section (straight duct), ribbed divergent square duct and ribbed convergent square duct. The convergent/divergent duct has an inclination angle of 1°. The measurement was conducted within the range of Reynolds numbers from 10 000 to 77 000. The heat transfer performance of the divergent/convergent ducts is compared with the ribbed straight duct under three constraints: identical mass flow rate, identical pumping power and identical pressure drop. Because of the streamwise flow acceleration or deceleration, the local heat transfer characteristics of the divergent and convergent ducts quite different from those of the straight duct. In the straight duct, the fluid flow and heat transfer become fully developed after 2-3 ribs, while in the divergent and convergent ducts there is no such trend. The comparison shows that among the three ducts, the divergent duct has the highest heat transfer performance, the convergent duct has the lowest, while the straight duct locates somewhere in between.
URI: http://hdl.handle.net/10397/8690
ISSN: 0142-727X
DOI: 10.1016/S0142-727X(01)00127-8
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