| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 95 === Membrane distillation is a novel separation technology and has the advantage of being easy to operate, small-scaled, safe and high energy efficient. Global warming has reduced the supply of fresh water and we hope to use membrane distillation as a source to obtain fresh water.
In membrane distillation, a hydrophobic membrane separate two mixtures of different temperature. The difference in temperature of the mixture will cause the formation of vapor pressure gradient on the surface of the membrane which causes the gas particle of the higher temperature mixture to move to the lower temperature end. Thus, the steam pressure difference at the two sides of the membrane is considered the driving force of membrane distillation.
In this work, the combination of membrane distillation with hollow fiber tube as a system is simulated, with the aim to understand the effect of various parameters on the system and conduct equipment design to increase efficiency and productivity. After understanding the transport phenomena, through investigation of the momentum, heat and mass transfer, the models for Direct-Contact Membrane Distillation and Air Gap Membrane Distillation which describe the internal temperature, concentration, flow rate and pressure a long the length of the tube is developed and optimization design method to increase efficiency and productivity is also proposed.
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