Convection in Porous Media by Donald A. Nield, Adrian Bejan

By Donald A. Nield, Adrian Bejan

This up to date version of a greatly favorite textual content presents a easy advent to the sector that calls for in basic terms regimen arithmetic. The e-book begins with the weather of fluid mechanics and warmth move, and covers quite a lot of purposes from fibrous insulation and catalytic reactors to geological strata, nuclear waste disposal, geothermal reservoirs, and the garage of heat-generating fabrics. because the general reference within the box, this publication may be necessary to researchers and working towards engineers, whereas ultimate an available advent for graduate scholars and others coming into the sector. the recent version good points 2700 new references masking a couple of swiftly increasing fields, together with the warmth move houses of nanofluids and purposes related to neighborhood thermal non-equilibrium and microfluidic effects.

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The linear terms in Eq. 15) and the unidirectional case ofEq. 16) which is Kozeny's equation, but it is not possible at the same time to make the quadratic terms identical, in general. Some authors have forced them to be identi- 12 1. (3-1I2

In this case the quadratic term vanishes. 15) where dp is the mean particle diameter and ex and ~ are shape factors that must be determined empirically. 75 and ~ = 150 this equation is known as Ergun's equation (Ergun, 1952). The linear terms in Eq. 15) and the unidirectional case ofEq. 16) which is Kozeny's equation, but it is not possible at the same time to make the quadratic terms identical, in general. Some authors have forced them to be identi- 12 1. (3-1I2

Brinkman set Jl and il equal to each other, but in general that is not true. In recent papers Eq. 5. 6 according to Lundgren (1972). 6. When the Brinkman equation is employed as a general momentum equation the situation is more complicated. In Eq. 17) P is the intrinsic fluid pressure, so each term in that equation represents a force per unit volume of the fluid. A detailed averaging process leads to the result that, for an isotropic porous medium, Ctlll = l/

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