Dead-end membrane distillation with localized interfacial heating for sustainable and energy-efficient desalination
نویسندگان
چکیده
Membrane distillation (MD) has the high potential to circumvent conventional desalination limitations in treating highly saline brines. However, performance of MD is limited by its low thermal efficiencyand temperature polarization (TP) effect. Consequently, driving force decreases when heat loss increases.In this study, we propose minimize TP through localized heating where thin feed channel was heated uniformly at membrane-liquid interface without changing properties membrane.This concept further improved implementing a new dead-end configuration. Investigated for first time,this configuration eliminated circulation losses, which cannot be realized due rapid stratification. In addition, accumulation foulants on membrane surface successfully controlled intermittent flushing. 3-Dimensional conjugate transfer modeling revealedmore uniform and gradient across increased water over larger area. The increase vapor flux (45%) reduction lossobserved led decrease specific energy consumption 57%, corresponding gain output ratio about 132 %, compared bulk heating, while preserving integrity. A model deployed ANSYS-Fluent framework elucidate mechanism enhancement associated with proposed technique. This study provides future sustainable developmentby maintaining stable minimizing consumption.
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ژورنال
عنوان ژورنال: Water Research
سال: 2021
ISSN: ['0043-1354', '1879-2448']
DOI: https://doi.org/10.1016/j.watres.2020.116584