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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Druckformat: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v24.i1-4.170
pages 271-290

TRANSIENT LIQUID CRYSTAL TECHNIQUE FOR IMPINGING HEAT TRANSFER OF INLINE AND STAGGERED JET ARRAYS

W. M. Yan
Department of Mechanical Engineering, Hua Fan University Shih-Ting, Taipei, 22305, Taiwan, ROC
H. C. Liu
Department of Mechanical Engineering, Hua Fan University Shih-Ting, Taipei, 22305, Taiwan, ROC
Chyi-Yeou Soong
Department of Aeronautical Engineering, Feng Chia University Seatwen, Taichung 40745, Taiwan, ROC
Wen-Jei Yang
Department of Mechanical Engineering and Applied Mechanics University of Michigan, Ann Arbor, Michigan 48109-2125, U.S.A.

ABSTRAKT

The objective of the present experimental work is the study of local heat transfer performance over a target plate under impingement of inline and staggered jet arrays by a liquid crystal thermograph technique. Three jet-to-target spacings Z (= z/d) of 3, 6, and 9 with inline and staggered jet arrays were considered at jet Reynolds numbers Re = 1500, 3000, and 4500 in three different exit-flow orientations. The results show that the local heat transfer rates are characterized by obvious periodic-type variation of Nusselt number distributions. The downstream peaks are diminished with increasing cross-flow effect. The best heat transfer performance is obtained with the cross flow exiting from both ends of the impingement channel. The inline jet array produces relatively higher local and overall heat transfer rates than those of the staggered jet array. Additionally, in the present results of 3 ≤ Z ≤ 9, higher heat transfer rates are found for the system with a smaller jet-to-plate spacing.


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