Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

The Flow Resistance and Heat Transfer Characteristics of Micro Pin-Fins with Different Cross-Section Shapes

Get access (open in a dialog) DOI: 10.1615/IHTC15.nmm.008946
pages 5531-5545

Abstrakt

De-ionized water flowed through the channel fitted staggered array micro pin-fins groups of circular, diamond, ellipse, respectively, and the flow resistance and heat transfer characteristics were experimentally investigated over Reynolds number ranging from 8 to 1000. The investigation showed the flow resistance and heat transfer had been increased due to the endwall effect and large pin-fins density at low Reynolds number. With the increase of Reynolds number, the endwall effect was weakened, but the flow resistance was still increase due to the appearance of vortex resistance, and the heat transfer was also enhanced because the flow disturbance or transition from laminar flow to turbulent flow began. At the same hydraulic diameter and Reynolds number, the flow resistance of the diamond pin-fin was minimal and the ellipse maximal at laminar flow. For turbulent flow the situation was just the reverse. However, Nussult numbers of ellipse pinfin was maximal compared with other two geometries and diamond pin-fin was minimal whether at laminar state or turbulence state. The experimental results were compared with predictions of the classical correlations for flow resistance and convective heat transfer in laminar, transitional or turbulent regime for the staggered array micro pin-fins groups, the comparisons indicated only the correlation related to the diamond shaped micro pin-fin groups approximately agreed with experimental data, but all existing correlations about staggered array micro pin-fins groups with circular and ellipse shapes could hardly accurately describe the flow and heat transfer characteristics covering laminar, transitional and turbulent states.