Abstract

It is efficient to recover water and latent heat from flue gas by using a porous ceramic membrane. In this paper, an experimental and numerical simulation is used for studying the heat transfer and flow of fluid in the ceramic tube in a porous membrane. The experimental data shows that the inlet velocity of feed gas and porosity of membrane enhance the heat and mass transfer performance of membranes when the range of which is 0.65–2.87 m/s and 60–78% respectively. Based on the minimum entransy dissipation, the Lagrange multiplier method is used to deduce the optimal momentum equation, which is interpreted by user definition functions (UDF) of FLUENT 15.0. A numerical study is carried out by varying Reynolds number, thickness of condensate, and values of momentum loss in this paper. The results show that the mass flux of water recovery is 0.25 kg/m2.h when Re was in range of 2.17 × 102~1.13 × 103, thickness of condensation film (δcon) is close to 0.02 mm, and membrane porosity (ф) is close to 70%.

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