Effect of shape modification on heat transfer and drag for fluid flow past a cam-shaped cylinder

Chamoli, Sunil1,2; Tang, Tingting1; Yu, Peng1; Lu, Ruixin1

2019-03

10.1016/j.ijheatmasstransfer.2018.11.057

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   影响因子和分区

0017-9310

1879-2189

In this study, a cam-shaped cylinder immersed in the cross-flow is investigated numerically, which is made of two circular cylinders joined by their two common tangents. The equivalent diameter of the cam-shaped cylinder D-eq is constant, which is maintained by adjusting the diameters of and the distance between the front and rear cylinders. The present study systematically investigates the effects of shape transformation of a base circular cylinder into different shapes of the cam-shaped cylinder on the flow and heat transfer characteristics. The cam-shaped cylinders with different relative diameter ratios of cylinder 1 (D-1/D-eq, = 0.2-0.84), and different relative diameter ratios of cylinder 2 (D-2/D-eq = 0.5-0.9) for the two Reynolds numbers (Re = 100, and 200) are considered. The functional dependence of drag coefficient (C-D) and lift coefficient (C-Lmax) on D-1/D-eq, and D-2/D-eq are examined. C-D decreases with an increase in Re and a decrease in D-2/D-eq, respectively, while the Strouhal number (St) increases with a decrease in D-2/D-eq. The average Nusselt number ((Nu) over bar) increases with an increase in Re and decreases with a decrease in D-2/D-eq. The change in (Nu) over bar is almost negligible for a low D-1/D-eq. Different regimes are proposed for the design parameters selection for high (Nu) over bar and low C-D. In the regime of constrained design and flow conditions, the present cam-shaped cylinders show their superiority over the other bluff bodies in terms of enhanced heat transfer and reduced drag. (C) 2018 Elsevier Ltd. All rights reserved.

Cam-shaped cylinder Reynolds number Vortex shedding Nusselt number Drag coefficient

SCI ; EI

英语

第一 ; 通讯

Thermodynamics ; Engineering ; Mechanics

Thermodynamics ; Engineering, Mechanical ; Mechanics

WOS:000456761100101

PERGAMON-ELSEVIER SCIENCE LTD

20184906203752

Cams ; Drag ; Drag coefficient ; Flow of fluids ; Nusselt number ; Reynolds number ; Vortex shedding

Mechanisms:601.3 ; Fluid Flow, General:631.1 ; Heat Transfer:641.2

ENGINEERING

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdongz, Peoples R China
2.GBPIET, Dept Mech Engn, Pauri Garhwal 246194, India

Chamoli, Sunil,Tang, Tingting,Yu, Peng,et al. Effect of shape modification on heat transfer and drag for fluid flow past a cam-shaped cylinder[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2019,131:1147-1163.

Chamoli, Sunil,Tang, Tingting,Yu, Peng,&Lu, Ruixin.(2019).Effect of shape modification on heat transfer and drag for fluid flow past a cam-shaped cylinder.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,131,1147-1163.

Chamoli, Sunil,et al."Effect of shape modification on heat transfer and drag for fluid flow past a cam-shaped cylinder".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 131(2019):1147-1163.