ライブラリ登録: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

CONVECTION IN A POROUS MEDIUM WITH INCLINED TEMPERATURE GRADIENT AND HORIZONTAL MASS FLOW

Get access (open in a dialog) DOI: 10.1615/IHTC9.3380
pages 153-158

要約

Linear instability analysis is applied to a basic flow which is a combination of a Hadley flow and an imposed horizontal flow, with a temperature gradient inclined to the vertical, in a horizontal layer of a saturated porous medium lying between impermeable conducting boundaries. It is shown that the instability appears in the form of stationary longitudinal rolls (with axes aligned in the direction of the horizontal component of the temperature gradient) superimposed on the basic flow. When the net horizontal mass flux Q is zero, there is a sudden jump in critical wavenumber as the horizontal temperature gradient increases, corresponding to a transition from a symmetric to an antisymmetric disturbance. As Q increases from zero, this jump weakens and finally disappears. The effect of non-zero Q is destabilizing. At sufficiently large values of Q, instability is possible in the absence of a vertical temperature gradient.