Publicado 4 números por año
ISSN Imprimir: 1065-3090
ISSN En Línea: 1940-4336
Indexed in
INTERFEROMETRIC STUDY OF TRANSIENT CONVECTION IN A SQUARE CAVITY
SINOPSIS
An interferometric study of transient natural convection in a long air-filled square cavity is discussed. The top and bottom walls of the cavity are maintained at uniform temperatures at all times in an unstably stratified configuration. Three different Rayleigh numbers, namely, 8.79 × 104, 1.98 × 105, and 3.38 × 105, have been considered. The orientation of the light beam is maintained parallel to the longest dimension of the cavity. The fringes thus obtained reveal depth-averaged isotherm patterns in the cavity at various points in time. The fringe patterns are collected by a CCD camera and transferred to a PC-AT in digitized form. The image is filtered and fringes are thinned using image-processing operations. Subsequently, the local and average heat transfer parameters in the experimental set up are computed. Results of the present study show that the onset of flow in the cavity is bicellular. However, the flow is unicellular for most part of the transient. The flow becomes increasingly vigorous, and the average Nusselt number of the cavity is a maximum at steady state.
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Kishor Vimal, Singh Suneet, Srivastava Atul, Investigation of convective heat transfer phenomena in differentially-heated vertical closed cavity: Whole field experiments and numerical simulations, Experimental Thermal and Fluid Science, 99, 2018. Crossref