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Analysis of the effect of turbulence promoters in hollow fiber membrane distillation modules by computational fluid dynamic (CFD) simulations

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Analysis of the effect of turbulence promoters in hollow fiber membrane distillation modules by computational fluid dynamic (CFD) simulations
นักวิจัย : Yang, Xing , Yu, Hui , Wang, Rong , Fane, Anthony Gordon
คำค้น : DRNTU::Engineering::Environmental engineering::Water treatment.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Yang, X., Yu, H., Wang, R., & Fane, A. G. (2012). Analysis of the effect of turbulence promoters in hollow fiber membrane distillation modules by computational fluid dynamic (CFD) simulations. Journal of Membrane Science, 415-416, 758-769. , 0376-7388 , http://hdl.handle.net/10220/10023 , http://dx.doi.org/10.1016/j.memsci.2012.05.067 , 172996
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Journal of membrane science
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

As an extended exploration of process enhancing strategies, nine modified hollow fiber modules with various turbulence promoters were designed and modeled using a two dimensional computational fluid dynamic (CFD) heat-transfer model to investigate their potential in improving heat transfer and module performance for a shell-side feed direct contact membrane distillation (DCMD) system. With the aids of turbulence promoters, the feed heat-transfer coefficient hf of the modified modules generally showed much slower decreasing trends along the fiber length compared to the original (unmodified) module. A 6-fold hf enhancement could be achieved by a modified module with annular baffles and floating round spacers. Consistently, the temperature polarization coefficient (TPC) and mass flux distribution curves of these modified modules presented increasing trends and gained an optimal improvement of 57% and 74%, respectively. With the local flow fields and temperature profiles visualized in CFD simulations, it was confirmed that an appropriate selection of turbulence promoters could promote intense secondary flows and radial mixing to improve the shell-side hydrodynamics and enhance heat transfer. Moreover, an increase of flow velocity was used and compared as a conventional approach to improve hydrodynamics. It was found that a well-designed module could bring more significant enhancement for a liquid-boundary layer dominant heat-transfer process. Finally, the hydraulic energy consumption (HEC) caused by the insertion of turbulence promoters or the increase of circulating velocity was compared. Configurations with attached quad spacers or floating round spacers achieved a good compromise between enhanced permeation fluxes and modest HECs. Overall, the TPC decreases with increasing MD coefficient (C) values and operating temperatures; while the thermal efficiency increases dramatically with increasing C and operating temperatures in a MD system.

บรรณานุกรม :
Yang, Xing , Yu, Hui , Wang, Rong , Fane, Anthony Gordon . (2555). Analysis of the effect of turbulence promoters in hollow fiber membrane distillation modules by computational fluid dynamic (CFD) simulations.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Yang, Xing , Yu, Hui , Wang, Rong , Fane, Anthony Gordon . 2555. "Analysis of the effect of turbulence promoters in hollow fiber membrane distillation modules by computational fluid dynamic (CFD) simulations".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Yang, Xing , Yu, Hui , Wang, Rong , Fane, Anthony Gordon . "Analysis of the effect of turbulence promoters in hollow fiber membrane distillation modules by computational fluid dynamic (CFD) simulations."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Yang, Xing , Yu, Hui , Wang, Rong , Fane, Anthony Gordon . Analysis of the effect of turbulence promoters in hollow fiber membrane distillation modules by computational fluid dynamic (CFD) simulations. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.