Effect of membrane surface wetting on the performance of direct contact membrane distillation for seawater desalination

Saeidiharzand, Shaghayegh and Sadaghiani, Abdolali Khalili and Koşar, Ali (2022) Effect of membrane surface wetting on the performance of direct contact membrane distillation for seawater desalination. Cleaner Engineering and Technology, 8 . ISSN 2666-7908

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Membrane distillation (MD) is a standalone process to generate fresh water and is especially attractive when low-grade waste heat or renewable thermal energy is available. Surface wetting hinders the commercialization of Membrane distillation (MD) technology by deteriorating the permeate quality, thermal efficiency, and transmembrane flux. There is still a lack of understanding on how and to what extent the partially wetted membranes affect the performance of direct contact MD (DCMD) systems. It is of great importance to optimize the operating conditions under such conditions. The DCMD performance was addressed in the literature by considering non-wetted or fully wetted membranes. This study for the first time proposes a computational model to investigate the effect of membrane surface wetting ratio (R = Lwet/Ltotal) on the transmembrane (J) and thermal efficiency (η) of a DCMD module. Parametric and sensitivity analyses were performed to display the effect of system parameters (feed temperature, feed velocity, permeate temperature, permeate velocity, membrane thickness, and membrane surface wetting ratio) on the Key Performance Indicators (KPIs) of the DCMD module. The obtained results indicate that the permeate side temperature has more effect (more than twice) on KPIs in wetted membranes (∼30% and ∼15% rise in J and η) compared to the non-wetted ones (∼15% and ∼5% enhancement in J and η), and the negative effect of membrane surface wetting could be minimized by adjusting the permeate side operational conditions. The effect of membrane wetting ratio on the performance of the DCMD module in thin membranes (≤0.2 mm) and thick membranes (≥0.25 mm) strongly depends on the permeate and feed temperatures. The parametric and sensitivity analysis performed in this study will be beneficial to optimizing the operational conditions of MD systems for maximizing their performance and could serve as valuable guidelines in the development of efficient water desalination systems.
Item Type: Article
Uncontrolled Keywords: Direct contact membrane distillation; Membrane surface wetting; Numerical model; Parametric analysis; Sensitivity analysis
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA168 Systems engineering
T Technology > TP Chemical technology > TP0155-156 Chemical engineering
Divisions: Center of Excellence on Nano Diagnostics
Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Abdolali Khalili Sadaghiani
Date Deposited: 22 Aug 2022 16:35
Last Modified: 04 Sep 2022 20:57
URI: https://research.sabanciuniv.edu/id/eprint/44143

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