期刊
COMPUTERS & MATHEMATICS WITH APPLICATIONS
卷 81, 期 -, 页码 725-736出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.camwa.2019.12.007
关键词
Entropy production; Nanofluid; Conductive walls; Inclined enclosure; Magnetic field; Open-source CFD software
资金
- NSFC, China [51709244, 51979261]
- Fundamental Research for Central Universities, China [201941008]
- Qingdao Fundamental Research, China [19-6-2-14-cg]
The study examines the entropy production of Al2O3-water nanofluid in an oblique cavity enclosure, revealing that minimum entropy production occurs at low power magnetic fields, an increase in cavity slope leads to an increase in entropy production, and the addition of nanoadditives intensifies entropy production and reduces the Bejan number.
In the present work, the entropy production of Al2O3-water nanofluid in an oblique cavity enclosure is examined. The side edges of the enclosure are at lower temperature and the top and down ones are insulated. Two thick conductive walls are placed on the low temperature edges. Furthermore, the center of the enclosure is equipped with a constant high temperature heat source. The enclosure is exposed to an inclined magnetic field. The governing nonlinear partial differential equations are continuity, Navier-Stokes and energy equations. These equations are solved using an open-source CFD software package (OpenFOAM). The influence of effective parameters includes Ra number, Hartman number, the angles of magnetic field and enclosure, nanoadditives concentration, and aspect ratio on the entropy production and the Bejan (Be) number are investigated. The results show that the minimum entropy production happened at low power magnetic fields. With the increase of the slope of the cavity, the entropy production rises. The addition of nanoadditives leads to an intensification in the entropy production and a reduction in the Be number. (C) 2019 Elsevier Ltd. All rights reserved.
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