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- Title
CFD simulation and optimization of an energy-efficient direct contact membrane distillation (DCMD) desalination system.
- Authors
Zare, Sahar; Kargari, Ali
- Abstract
In this paper, the CFD simulation and optimization of an energy-efficient direct contact membrane distillation (DCMD) desalination system in a counter-current flow mode are performed. Two-dimensional modeling was applied and the governing equations for momentum, heat, and mass transfer in the three regions i.e., feed channel, membrane, and permeate channel were solved and corresponding velocity, temperature, concentration fields, and the permeate water flux through the membrane was obtained. A two-step approach was considered to optimize the desalination system through the MD process. First, the model results were validated with the reported experimental data and good agreements were observed. The maximum deviation for the outlet concentration and hot stream outlet temperature with different feed velocities and temperatures was 0.33%. Then, the process was optimized for maximizing the permeate flux. Since the number of parameters was high, the response surface methodology (RSM) was used to find the optimum condition in order to obtain the maximum water flux. It was determined that the highest permeate water flux would be gained at the permeate temperature, the hot feed flow rate, the cold-water flow rate, the length and height of the channels of 35 °C, 20 lit/min, 10.25 lit/min, 20 cm, and 3 cm, respectively. At this optimum condition, a permeate flux of 53.5 kg/m2.h and a TPC of 0.82 are expected. • CFD simulation and data validation of a DCMD desalination system are done. • Optimization for process and module geometry variables was performed. • Simultaneous RSM and CFD simulation was applied for the optimization.
- Subjects
MEMBRANE distillation; WATER temperature; RESPONSE surfaces (Statistics); MASS transfer; TWO-dimensional models
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2022, Vol 188, p655
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2022.10.001