Thermal Convection in Porous Media at High Rayleigh Numbers

被引:20
|
作者
Keene, Daniel J. [1 ]
Goldstein, R. J. [2 ]
机构
[1] Seattle Pacific Univ, Dept Engn & Comp Sci, Seattle, WA 98119 USA
[2] Univ Minnesota, Dept Mech Engn, Minneapolis, MN 55455 USA
来源
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME | 2015年 / 137卷 / 03期
基金
美国国家科学基金会;
关键词
experimental; Rayleigh-Benard; natural convection; porous media; NATURAL-CONVECTION; HEAT-TRANSFER; BENARD CONVECTION; DISPERSION; LAYERS; WATER; DARCY; MODEL; FOAM;
D O I
10.1115/1.4029087
中图分类号
O414.1 [热力学];
学科分类号
摘要
An experimental study of thermal convection in a porous medium investigates the heat transfer across a horizontal layer heated from below at high Rayleigh number. Using a packed bed of polypropylene spheres in a cubic enclosure saturated with compressed argon, the pressure was varied between 5.6 bar and 77 bar to obtain fluid Rayleigh numbers between 1.68 x 10(9) and 3.86 x 10(11), corresponding to Rayleigh-Darcy numbers between 7.47 x 10(3) and 2.03 x 10(6). From the present and earlier studies of Rayleigh-Benard convection in both porous media and homogeneous fluid systems, the existence and importance of a thin thermal boundary layer are clearly demonstrated. In addition to identifying the governing role of the thermal boundary layer at high Rayleigh numbers, the successful correlation of data using homogeneous fluid dimensionless groups when the thermal boundary layer thickness becomes smaller than the length scale associated with the pore features is shown.
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页数:4
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