Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised solid cylinder

被引:26
作者
Ishak, Muhamad S. [1 ,2 ]
Alsabery, Ammar I. [3 ]
Hashim, Ishak [1 ]
Chamkha, Ali J. [4 ,5 ]
机构
[1] Univ Kebangsaan Malaysia, Fac Sci & Technol, Dept Math Sci, Bangi 43600, Selangor, Malaysia
[2] Univ Tenaga Nas, Coll Fdn & Diploma Studies, Dept Engn, Kajang 43000, Selangor, Malaysia
[3] Islamic Univ, Coll Tech Engn, Refrigerat & Air Conditioning Tech Engn Dept, Najaf, Iraq
[4] Kuwait Coll Sci & Technol, Fac Engn, Doha 35001, Kuwait
[5] King Abdulaziz Univ, Ctr Excellence Desalinat Technol, POB 80200, Jeddah 21589, Saudi Arabia
关键词
LID-DRIVEN CAVITY; NATURAL-CONVECTION; SQUARE CAVITY; HEAT-TRANSFER; MAGNETIC-FIELD; GENERATION; FLOW; CONDUCTIVITY;
D O I
10.1038/s41598-021-94238-w
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The entropy production and mixed convection within a trapezoidal nanofluid-filled cavity having a localised solid cylinder is numerically examined using the finite element technique. The top horizontal surface moving at a uniform velocity is kept at a cold temperature, while the bottom horizontal surface is thermally activated. The remaining surfaces are maintained adiabatic. Water-based nanofluids (Al2O3 nanoparticles) are used in this study, and the Boussinesq approximation applies. The influence of the Reynolds number, Richardson number, nanoparticles volume fraction, dimensionless radius and location of the solid cylinder on the streamlines, isotherms and isentropic are examined. The results show that the solid cylinder's size and location are significant control parameters for optimising the heat transfer and the Bejan number inside the trapezoidal cavity. Furthermore, the maximum average Nusselt numbers are obtained for high R values, where the average Nusselt number is increased by 30% when R is raised from 0 to 0.25.
引用
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页数:22
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