Jin, D. X. Lee, Y. P. Lee, D.-Y. 2024-01-21T01:00:20Z 2024-01-21T01:00:20Z 2021-09-02 2007-07 0017-9310 https://pubs.kist.re.kr/handle/201004/134291 Heat transfer enhancement by pulsating flow in a triangular grooved channel has been experimentally investigated for the ranges of 270 <= Re <= 910 and 0.08 <= St <= 0.67. It is measured that the heat transfer improved up to 350% at Re = 270 and St = 0.34 compared with the steady flow case. The heat transfer enhancement is found to increase as Reynolds number decreases. It is also found that the optimal Strouhal number increases as Reynolds number decreases. To analyze the correlation between the pulsating flow behaviors and the heat transfer enhancement characteristics, a PIV investigation has been performed. The PIV results show that the heat transfer, enhancement results from the strong mixing caused by the repeating sequence of vortex generation, growth, expansion and ejection from the groove to the main stream by the pulsating flow. The fluid mixing enhancement is maximized when the pulsation period matches with the time duration for the vortex to grow large enough to fill the groove and then to be ejected to the main stream. (C) 2007 Published by Elsevier Ltd. English PERGAMON-ELSEVIER SCIENCE LTD MASS-TRANSFER ENHANCEMENT TRANSFER AUGMENTATION Effects of the pulsating flow agitation on the heat transfer in a triangular grooved channel Article 10.1016/j.ijheatmasstransfer.2006.12.001 1 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.50, no.15-16, pp.3062 - 3071 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 50 15-16 3062 3071 scie scopus 000247047600021 2-s2.0-34247535309 Thermodynamics Engineering, Mechanical Mechanics Thermodynamics Engineering Mechanics Article MASS-TRANSFER ENHANCEMENT TRANSFER AUGMENTATION pulsating flow grooved channel heat transfer enhancement PIV vortex fluid mixing