Abstract
Membrane distillation (MD) is a thermally driven process in which only vapor molecules are transported through porous hydrophobic membranes from the hot feed side to the cold permeate side. The transport of vapor in MD consists of (1) evaporation of water at the warm feed side, (2) migration of vapor through the dry membrane pore, and (3) condensation of vapor on the permeate side. Simultaneous heat and mass transfer occur in MD for various applications (desalination, environmental/waste cleanup, water reuse, food, medical, etc.) by different MD configurations, such as direct contact MD, sweeping gas MD, vacuum MD, and air gap membrane MD. The MD transport mechanism is either Knudsen diffusion, ordinary diffusion, or a combination thereof, depending on the Knudsen number.
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