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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

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Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v8.i2-3.110
10 pages

VISUALIZATION OF FLOW PATTERN AND TEMPERATURE DISTRIBUTION ON FLOW OVER HEATED SURFACE WITH FIN BANKS

Hiroshi Ohue
Department of Mechanical Engineering, Musashi Institute of Technology, 1-28-1 Tamazutsumi, Setagaya-ku, Tokyo, 158-8557
Genshi Kawashima
Department of Mechanical Engineering, Musashi Institute of Technology, 1-28-1 Tamazutsumi, Setagaya-ku, Tokyo, 158-8557

Краткое описание

We performed thermal visualization to determine unsteady heat transfer in a flow through an array of slanted fins installed vertically on a heated surface coated with a thin sheet of thermosensitive liquid crystal. The fins are arranged in in-line and staggered forms. The fin angle, transverse pitch, and longitudinal pitch are varied. The convective heat transfer phenomena can be visualized as color distribution on the liquid crystal sheet which exhibits temperature variation. Color image processing is performed on the visualized images to determine the quantitative temperature distribution through a hue angle-temperature correlation curve, and thus we can represent the unsteady temperature distribution for convective heat transfer. We also performed flow visualization of flow patterns through the fin array. The Nusselt number for convective heat transfer between the heated surface and the cold fluid is calculated from the temperature distribution. Pressure drop for the flow through the fin array is measured and is expressed in the form of the coefficient of pressure loss. Results are correlated as Nusselt number versus coefficient of pressure loss for fin angles, fin arrangements, and flow patterns.


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