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Membrane Water Treatment Volume 16, Number 1, January 2025 , pages 13-27 DOI: https://doi.org/10.12989/mwt.2025.16.1.013 |
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Empirical determination of Nusselt number for Flux prediction in DCMD process |
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Bora Shin, Jaewon Shin, Yanuar Chandra Wirasembada and Jinwoo Cho
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| Abstract | ||
| This study aims to empirically derive a Nusselt number equation for predicting water flux in a direct contact membrane distillation (DCMD) system under varying cross flow velocities (CFV) and temperatures. The temperature of the bulk solution and the membrane surface differ due to the heat transfer coefficient. It is essential to determine the temperature of the membrane's surface using the heat transfer coefficient, which can be calculated using the Nusselt number, in order to predict the flux. The heat transfer coefficient varies due to various factors, which include membrane characteristics, operating conditions, module configurations, and overall system designs. The heat transfer coefficient varies depending on the characteristics of each system. Directly using previously reported Nusselt equations has limitations in predicting flux. It is necessary to derive an empirical equation for the system that was used in this study. One influential factor related to heat transfer is the CFV and temperature. Experiments were conducted under varying CFV (0.069–0.208 m/s) and temperatures (40–60 | ||
| Key Words | ||
| cross flow velocity; heat transfer coefficient; membrane distillation; Nusselt number | ||
| Address | ||
| Bora Shin, Jaewon Shin, Yanuar Chandra Wirasembada and Jinwoo Cho: Department of Environment and Energy, Sejong University, 209 Neungdong-ro, Gwangin-gu, Seoul 05006, Republic of Korea | ||
