Numerical study on heat transfer and flow characteristics of nanofluids in a circular tube with trapezoid ribs

Open Physics

Zheng Hongwei¹  Wang Wei²  Cui Lanhua³  Wang Jin⁴  Zhang Bo⁴  Klemeš Jiří Jaromír⁵ 

[1] Experimental Training Center, Hebei University of Technology, Tianjin 300401, China;Innovation and Entrepreneurial Center, Hebei University of Technology, Tianjin 300401, China;Library, Hebei University of Technology, Tianjin 300401, China;School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China;Sustainable Process Integration Laboratory – SPIL, NETME Centre, Faculty of Mechanical Engineering, Brno University of Technology – VUT Brno, Technická 2896/2, 616 69 Brno, Czech Republic;

关键词: nanofluids;    trapezoid rib;    heat transfer enhancement;    angle;    friction factor;   

DOI  :  10.1515/phys-2021-0022

来源: DOAJ

【 摘 要 】

This study aims to investigate heat transfer and flow characteristics of ethylene glycol/water (EGW) and CuO–EGW nanofluids in circular tubes with and without trapezoid ribs. Nusselt number and friction factor in tubes with trapezoid ribs are analysed under a constant heat flux by changing rib bottom angles. This study compares the convective heat transfer coefficients of 6 vol.% CuO–EGW nanofluid and base fluid. It is found that under a constant Reynolds number, the Nusselt number and friction factor for CuO–EGW nanofluid and base fluid increase with an increase in the inclination angle. The Nusselt number for the CuO–EGW nanofluid in the tube with 75° rib bottom angle averagely increases by 135.8% compared to that in the smooth tube, and the performance evaluation criterion is 1.64.

【 授权许可】

Unknown