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Improving the performance of direct contact membrane distillation utilizing spacer-filled channel.pdf

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Improving the performance of direct contact membrane distillation utilizing spacer-filled channel.pdf

Desalination 408 (2017) 25–35 Contents lists available at ScienceDirect Desalination journal homepage: /locate/desal Improving the performance of direct contact membrane distillation utilizing spacer-?lled channel Yazan Taamneh a,?, Kahled Bataineh b a Department of Aeronautical Engineering, Jordan University of Science and Technology, P.O. Box 3030, 22110 Irbid, Jordan b Department of Mechanical Engineering, Jordan University of Science and Technology, P.O. Box 3030, 22110 Irbid, Jordan HIGHLIGHTS ? 3D CFD modeling is used to improve the performance of DCMD module. ? The effect of the ?lament orientation on DCMD module was investigated. ? Spacers enhanced heat transfer coef?cient by approximately two times. ? The presence of spacer in membrane module increased the pressure drop. article info Article history: Received 18 June 2016 Accepted 3 January 2017 Available online 9 January 2017 Keywords: Fluid ?ow Spacer orientation Heat transfer Direct contact membrane distillation CFD abstract This study describes the effect of the presence and ?lament orientation of spacers on the ?ow pattern and heat transfer enhancement for a commercial direct contact membrane distillation module. In this research, both experimental and computational ?uid dynamics (CFD) simulations are carried out when the two sets of spacer ?laments are oriented at an angle of 45° to the channel axis and also when the top ?laments are oriented at an angle of 30°, 45°, 62° and 90° while the bottom ?laments are being parallel to the direction of ?ow. Fluid ?ow and heat transfer through empty and spacer-?lled channel at various ?lament orientations and Reynolds number are simulated. Besides predicting the Nusselt number and total drag coef?cient, the simulated results allow deeper understanding of the role of spacer presence and its ?lament orientation in ?uid and heat ?ow structure. It is found that the degree of enhancement in heat and mass transfer depends on ?lament orientation of spacers. The simulat

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