
Accession Number : AD0771483
Title : Large Amplitude Convection in Porous Media.
Descriptive Note : Rept. for AprAug 73,
Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
Personal Author(s) : Straus,Joe M.
Report Date : 15 DEC 1973
Pagination or Media Count : 35
Abstract : The properties of convective flow driven by an adverse temperature gradient in a fluidfilled porous medium are investigated. The Galerkin technique is used to treat the steady state two dimensional problem for Rayleigh numbers as large as ten times the critical value. The flow is found to look very much like ordinary Benard Convection, but the Nusselt number depends much more strongly on the Rayleigh number than in Benard convection. The stability of the finite amplitude two dimensional solutions is treated. At a given value of the Rayleigh number, stable two dimensional flow is possible for a finite band of horizontal wavenumbers as long as the Rayleigh number is small enough. For Rayleigh numbers larger than about 380, however, no twodimensional solutions are stable. Comparisons with previous theoretical and experimental work are given. (Author)
Descriptors : *Two dimensional flow, *Convection(Heat transfer), *Porous materials, Partial differential equations, Equations of motion, Numerical analysis
Subject Categories : Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE