Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/89627
Title: Experimental investigation on the effects of bifurcation angle on enhanced microscale heat transfer in macro geometry
Authors: Foo, Zi Hao
Cheng, Kai Xian
Ooi, Kim Tiow
Keywords: Heat Transfer
Bifurcation
DRNTU::Engineering::Mechanical engineering
Issue Date: 2016
Source: Foo, Z. H., Cheng, K. X., & Ooi, K. T. (2016). Experimental investigation on the effects of bifurcation angle on enhanced microscale heat transfer in macro geometry. Proceedings of International Conference on Mechanical, Industrial and Power Engineering (1st:2016:Tokyo,Japan), 262-274.
Abstract: The effectiveness of microscale heat transfer in macro geometry has been demonstrated to produce comparable heat transfer performance to that of conventional microchannels. For this research, a microchannel was created by fitting an insert with nominal diameter 19.4 mm concentrically within a hollow cylinder with inner diameter 20.0 mm, thereby producing a microchannel with an annular gap of 300 µm. Surface profiles on the insert were optimised to recover pressure loss, aiming to address the increased pumping requirements that accompany the improvement in heat transfer capabilities. A bifurcation angle was incorporated into the offset fin geometry design. The increased heat removal capability at the same pumping power and the reduction of pumping power for the same heat removal duty for three different bifurcation angles, namely 70, 75 and 80 degrees, were investigated with respect to parallel channels. The experimental study was conducted at a constant heat flux of 500 W at Reynolds number ranging from 690 to 4600. The amount of fluid in the microchannel, heat transfer area, rate of heat supplied, average channel gap size, channel length and fin height were kept constant. Experimental results successfully validated the effectiveness of bifurcation angles in the recovery of pressure loss across the microchannel. As compared to parallel channels, the 80-degrees bifurcating fins displayed the highest enhancement of the heat transfer coefficient and greatest reduction of the pumping power, which are 27% enhanced and 52% reduced respectively, at a given heat removal duty.
URI: https://hdl.handle.net/10356/89627
http://hdl.handle.net/10220/46160
Rights: © 2016 The Author(s) (International Conference on Mechanical, Industrial and Power Engineering (1st:2016:Tokyo,Japan)). This is the author created version of a work that has been peer reviewed and accepted for publication by International Conference on Mechanical, Industrial and Power Engineering (1st:2016:Tokyo,Japan). It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Conference Papers

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