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Convection in porous media has a large field of§application. Firstly, this book presents an§analytical and numerical study of the generation and§flow of methane gas through a layer of porous medium§impregnated with solid clathrate hydrates. Later,§design with constructal theory is addressed. We§start studying the fundamental problem of maximizing§the thermal contact between an entire heat-generatingvolume and a pulsating stream of coolant that bathes§the volume. A series of examples in which the global§performance of flow systems is optimized subject to§global constraints is also presented. The text§continues describing a hierarchical strategy to§developing the optimal internal structure of a round§heat-generating body cooled at its center with the§help of optimally distributed inserts of§high-conductivity material. Finally, it considers§the fundamental problem of squeezing into a fixed§volume the highest heat transfer rate that can be§made to occur between two streams at different§initial temperatures.