Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13144
Title: Numerical and experimental analysis of heat transfer in turbulent flow channels with two-dimensional ribs
Authors: Wang, HT
Lee, WB 
Chan, J 
To, S 
Keywords: Experiments
Heat transfer
Pressure drop
Ribs
Simulation
Ultra-precision raster milling (UPRM)
Issue Date: 2015
Publisher: Pergamon Press
Source: Applied thermal engineering, 2015, v. 75, p. 623-634 How to cite?
Journal: Applied thermal engineering 
Abstract: The repeated ribs surfaces are known for their effective enhancement of heat transfer, which is widely demanded in many scientific and industrial applications. In this paper, further improvements were made by the introduction of a textured asymmetric arc rib structure, on which arrays of secondary micro grooves are superimposed onto a primary asymmetric surface. Numerical simulation has been carried out on the turbulent force convection flow in a single-phase channel with two-dimension (2D) ribbed internal surface in the range of Reynolds number from 20,000 to 60,000. A uniform heat flux is applied on the external surface of channel. In contrast to the conventional optimized symmetric triangular rib, the advanced compound rib could improve the performance of heat transfer while minimizes the pressure drop. These improvements are closely correlated to the promotion of the separated flow which could reattach the channel surface. Since the geometry of the novel compound rib is difficult to fabricate by conventional means, ultra-precision raster milling (UPRM) is used to generate these micro-structures. According to prediction of numerical simulation, the experimental cooling works have been designed and conducted for the considered shaped ribs with the signi ficant dimensionless pitch of 5 and 6. A good agreement was found between the simulation and experimental results.
URI: http://hdl.handle.net/10397/13144
ISSN: 1359-4311
EISSN: 1873-5606
DOI: 10.1016/j.applthermaleng.2014.10.039
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