By Donald A. Nield, Adrian Bejan
Convection in Porous Media, 4th variation, presents a uncomplicated advent to the topic, protecting a variety of subject matters, corresponding to fibrous insulation, geological strata, and catalytic reactors. The presentation is self-contained, requiring purely regimen arithmetic and the elemental components of fluid mechanics and warmth move. The booklet should be of use not just to researchers and training engineers as a assessment and reference, but additionally to graduate scholars and others coming into the sphere. the hot version beneficial properties nearly 1,750 new references and covers present learn in nanofluids, mobile porous fabrics, robust heterogeneity, pulsating movement, and more.
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Extra info for Convection in Porous Media
This implies that for the same pressure gradient along the channel the mean flux is larger when there is a spatial variation of porosity: qðfÞ>qðfÞ. This means that if we use of the porosity, we obtain only a lower bound for the flow rate the average value ’ through the packed bed. Georgiadis and Catton (1987) found that in one realistic case qðfÞ could be 9 % greater than qðfÞ. Pressure-drop/flow rate measurements therefore would give an effective value for the permeability greater than that otherwise expected.
20). If the porous medium is adjacent to clear fluid identical to that which saturates the porous medium, and if there is unidirectional flow in the x direction (Fig. 22) 20 1 Mechanics of Fluid Flow Through a Porous Medium where uf is the velocity in the fluid and um is the seepage velocity in the porous medium. It is understood that in Eq. 22), uf and ∂uf/∂y are evaluated at y ¼ 0+ and um is evaluated at some small distance from the plane y ¼ 0, so there is a thin layer just inside the medium over which the transition in velocity takes place.
1994). A fibrous porous medium was modeled by Davis and James (1996). For randomly packed monodisperse fibers, the experiments of Rahli et al. (1997) showed that the Carman–Kozeny “constant” is dependent on porosity and fiber aspect ratio. The Carman–Kozeny correlation has been applied to compressed expanded natural graphite, an example of a high porosity and anisotropic consolidated medium, by Mauran et al. (2001). Li and Park (1998) applied an effective medium approximation to the prediction of the permeability of packed beds with polydisperse spheres.
Convection in Porous Media by Donald A. Nield, Adrian Bejan