Porous and Complex Flow Structures in Modern Technologies by Adrian Bejan

By Adrian Bejan

Porous and complicated move buildings in smooth applied sciences represents a brand new method of the sector, contemplating the basics of porous media when it comes to the most important roles performed via those fabrics in glossy know-how. meant as a textual content for complex undergraduates and as a reference for working towards engineers, the booklet makes use of the physics of flows in porous fabrics to tie jointly a wide selection of significant matters from such fields as biomedical engineering, power conversion, civil engineering, electronics, chemical engineering, and environmental engineering.

For instance, flows via porous flooring play a important position in power exploration and restoration (oil, geothermal fluids), power conversion (effluents from refineries and tool plants), and environmental engineering (leachates from waste repositories). equally, the calls for of miniaturization in electronics and in biomedical purposes are using examine into the circulate of warmth and fluids via small-scale porous media (heat exchangers, filters, fuel exchangers). Filters, catalytic converters, the drying of saved grains, and a myriad of alternative functions contain flows via porous media.

Another new function is the ‘constructal’ method of the new release of move constructions for maximal worldwide functionality (e.g. maximal warmth move density) at lowering size scales. during this course, the optimized constructions develop into ‘designed porous media’.

By supplying a unified theoretical framework that incorporates not just the normal homogeneous and isotropic media but additionally coarse buildings during which the assumptions of consultant elemental volumes or international thermal equilibrium fail, the publication offers working towards engineers the instruments they should examine complicated events that come up in perform. This quantity contains examples, numerous present references and an intensive thesaurus of symbols.

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Example text

11). This method was born by accident, in the search for a quick solution to a homework problem, namely, the optimal spacing between parallel plates with natural convection (Bejan, 1984, problem 11, p. 157). , a flow structure), it is helpful to describe the phenomenon in the simpler extremes (asymptotes) in which it may manifest itself. The complicated phenomenon lies somewhere between the extremes, and its behavior may be viewed as the result of the competition (clash, collision) between the extremes.

The following examples exhibit an accuracy better than within a factor of 2 or 1/2. The analysis is based on the complete problem statement, that is, the conservation equations and all the initial and boundary conditions. Partial differential equations are replaced by global algebraic statements, which are approximate. Scale analysis is a problem-solving method-a method of solution that should not be confused with dimensional analysis. A simple class of flows that can be described based on scale analysis is boundary layers.

The researcher has the freedom to choose the method that suits him or her (Bejan, 1995a). Methods are literally competitive because each is an example of a tradeoff between cost (effort) and accuracy. The simpler methods require less effort and produce less accurate results than the more complicated methods. , customers, students). The match of researcher, problem, and method is not the result of chance. It is an optimization decision (structure, configuration) in the sense of constructaltheory and design (Bejan, 2000).

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