Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 52, Issue 25-26, Pages 5978-5989Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2009.08.005
Keywords
Pin fin; Liquid cooling; Tip clearance; Liquid crystal; Heat transfer
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Shrouded pin fin arrays with tip clearances (Cg) up to 25% of pin height were experimentally evaluated. Pressure loss was measured (2 x 10(2) < Re(D) < 2 x 10(4)) and liquid crystal thermography was employed to obtain temperature distributions from which the impact of Cg on the mean heat transfer rate was determined for 2 x 10(2) < Re(D) < 1 x 10(4). Cg was found to influence pressure drop performance to the greatest extent at low Re(D), (<5 x 10(3)), with the effect being significantly diminished by Re(D) = 1.5 x 10(4). On a per unit pumping power basis, higher heat transfer rates were observed for dimensionless clearances (Cg/D) less than 0.2 as compared to the non-clearance case. (C) 2009 Elsevier Ltd. All rights reserved.
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