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김유빈(Yu-Bin Kim),임백규(Baek-Gyu Im),김영득(Young-Deuk Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Most of previous studies on direct contact membrane distillation (DCMD) process have been focused on the effect of operating conditions (i.e., temperature, flow rate and concentration) on the DCMD permeate flux. In this study, DCMD experiments are conducted to examine an influence of microbubble on the DCMD performance. A flat-sheet membrane module with an effective membrane area of 0.01 m² is adopted in the DCMD process with a composite membrane, which comprises of an active layer of polytetrafluoroethylene (PTFE) and a support layer of polypropylene (PP). The net-type PP spacers are employed at both feed and permeate channels as a membrane support and turbulence promoter. It is found that with an implementation of microbubble the heat and mass transfers across the membrane are greatly enhanced, resulting in a significant improvement in the DCMD permeate flux.