Enhancement On Membrane Distillation Based Seawater Desalination Utilizing Temperature Difference Between Dry And Wet Wall

This paper considers the use of "dry and wet wall temperature gradient" to promote the membrane distillation for seawater desalination, focused on the minimum effective scale of enhanced heat transfer surface under the dust medium; strengthened the dynamic flow between dry (wet) wall and the membrane.Depth of the random walk theory, and introduction of particle concentration boundary layer concept,study the theory about the deposition of dust in a tunnel, based on experimental,the result confirmed its legitimacy. At the same time, the paper also discussed the removal mechanism of particle adhesion, especially in the trenches of the gas and water removal, the critical Reynolds number for the theoretical calculation and experimental results matched well. The particle size distribution show the tunnel model is availability.For the fluid thermal instability between the membrane and wall, this paper also conducted in-depth, and typical Benard secondary flow is analyzed and numerical simulation, affirmed Benard secondary vortex of reducing membrane distillation of the "concentration polarization", "temperature polarization" influential role. Proposed a qualitative relationship between the relevant parameters for the future flow related heat-labile enhanced to provide a reference.Temperature difference between wet and dry wall to promote the flow of membrane distillation desalination process to strengthen the research, in order to solve the energy and water issues, come up with useful ideas, Micro-nano-surface heat transfer enhancement, the concentration polarization of membrane distillation and the temperature polarization suppression, providing a new idea.