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Date of Publication:2022-10-06

Journal:大连理工大学学报

Affiliation of Author(s):化工学院

Issue:3

Page Number:328-333

ISSN No.:1000-8608

Abstract:A heat and mass transfer model for vacuum membrane distillation of NaCl aqueous solution was established based on the dusty gas model. The average membrane pore size in the model was replaced by an experimentally fitted relationship of pore size distribution, and an effective combination of a consecutive pore size distribution with the membrane distillation model was achieved for the first time. Comparison of flux variation with temperature between experimental data and simulative results shows that prediction of the established model has a better agreement than that of the average pore size model. The effects of operating conditions and distribution function parameters on the distillation are discussed. Results show that the flux increases respectively with the increase in feed temperature and flowrate, and decreases with the increase in NaCl concentration. Under the operating conditions tested, the bigger the average pore size is, the bigger the flux is. While for the same average pore size, the narrower the pore size distribution is, the smaller the flux is.

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