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ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Volume 25, No. 02, Month AUGUST, Year 2018, Pages 191 - 202


Effects of pin configurations on heat transfer performance in a flow channel

Pathomporn Narato, Passakorn Vessakosol, Makatar Wae-hayee and Chayut Nuntadusit


Abstract Download PDF

The aim of this research is to study the heat transfer characteristics on an internal surface of rectangular wind tunnel by mounting pin array. The cylindrical pins which have diameter of D=10 mm were arranged with inline and staggered configurations and were normal to flow direction inside wind tunnel. The pin-to-pin spacing in streamwise and spanwise directions were varied at S/D=2, 4, and 6. The pin height was varied at H/D= 1, 2 and 3. The Reynolds number of internal flow was fixed at Re=30,000. The temperature distributions on the heat transfer surface were measured by using Thermochromic Liquid Crystal sheet ( TLCs) , and Nusselt number distributions were evaluated by using image processing technique. The results show that effect of pin height ratio (H/D) and pin-to-pin spacing ratio (S/D) were more significant on increasing heat transfer. In case staggered arrangement, heat transfer with low S/D and high H/D is the highest. The thermal performance that is equal to 1.08 is the highest at the case of H/D=1 and S/D=4 with inline arrangement.


Keywords

Heat transfer enhancement, Pin array, Pin arrangement, Pin height, Pin-to-Pin spacing



ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Published by : Faculty of Engineering Chiang Mai University
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