High-Rayleigh-Number Convection in a Vertical Channel

by: M Gibert, H Pabiou, F Chillà, B Castaing

Physical Review Letters, Vol. 96, No. 8. (2006)

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摘要

We measure the relation between convective heat flux and temperature gradient in a vertical channel filled with water, the average vertical mass flux being zero. Compared to the classical Rayleigh-Bénard case, this situation has the advantage of avoiding plates and, thus, their neighborhood, in which is usually concentrated most of the temperature gradient. Consequently, inertial processes should control the convection, with poor influence of the viscosity. This idea gives a good account of our observations, if we consider that a natural vertical length, different from the channel width, appears. Our results also suggest that heat fluxes can be deduced from velocity measurements in free convective flows. This confers to our results a wide range of applications.

@article{citeulike:2758347, abstract = {We measure the relation between convective heat flux and temperature gradient in a vertical channel filled with water, the average vertical mass flux being zero. Compared to the classical Rayleigh-B\énard case, this situation has the advantage of avoiding plates and, thus, their neighborhood, in which is usually concentrated most of the temperature gradient. Consequently, inertial processes should control the convection, with poor influence of the viscosity. This idea gives a good account of our observations, if we consider that a natural vertical length, different from the channel width, appears. Our results also suggest that heat fluxes can be deduced from velocity measurements in free convective flows. This confers to our results a wide range of applications.}, author = {Gibert, M. and Pabiou, H. and Chill\`a, F. and Castaing, B. }, citeulike-article-id = {2758347}, doi = {10.1103/PhysRevLett.96.084501}, journal = {Physical Review Letters}, keywords = {2006, boundary, flow, focus}, number = {8}, posted-at = {2008-05-05 17:18:53}, priority = {2}, publisher = {APS}, title = {High-Rayleigh-Number Convection in a Vertical Channel}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000096000008084501000001\&idtype=cvips\&gifs=yes}, volume = {96}, year = {2006} }

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TY - JOUR ID - citeulike:2758347 L3 - citeulike-article-id:2758347 TI - High-Rayleigh-Number Convection in a Vertical Channel JF - Physical Review Letters VL - 96 IS - 8 PB - APS N2 - We measure the relation between convective heat flux and temperature gradient in a vertical channel filled with water, the average vertical mass flux being zero. Compared to the classical Rayleigh-Bénard case, this situation has the advantage of avoiding plates and, thus, their neighborhood, in which is usually concentrated most of the temperature gradient. Consequently, inertial processes should control the convection, with poor influence of the viscosity. This idea gives a good account of our observations, if we consider that a natural vertical length, different from the channel width, appears. Our results also suggest that heat fluxes can be deduced from velocity measurements in free convective flows. This confers to our results a wide range of applications. KW - 2006 KW - boundary KW - flow KW - focus AU - Gibert, M AU - Pabiou, H AU - Chill\`a, F AU - Castaing, B PY - 2006/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000096000008084501000001&idtype=cvips&gifs=yes ER -

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