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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015010492
pages 157-176

NUMERICAL INVESTIGATION OF CONFINED SINGLE JET IMPINGING ON A DIMPLED TARGET SURFACE USING Al2O3−WATER NANOFLUIDS

Ping Li
Key Laboratory of Thermal Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province, 710049, P. R. China
Yong Hui Xie
Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, China
Di Zhang
Key Laboratory of Thermal Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province, 710049, P. R. China

ABSTRACT

Jet impingement has been investigated widely owing to its high rates of convective heat transfer near the stagnation zone. Nanofluids, beyond the traditional working fluids, have great advantages in high-rate-heat flux removal. In the present work, a confined single jet impinging on a dimpled target surface with Al2O3−water nanofluids as a working fluid was investigated numerically for the first time. The effects of the jet Reynolds number Rej (10,000−20,000) and nanoparticle volume concentration Ø (0−5%) on the flow structures and heat transfer characteristics were investigated. The geometrical parameters were H/Dj = 6, Dj/D = 0.5, and δ/D = 0.2. The vorticity contours and streamlines of the confined domain, wall shear stress and pressure coefficient on the target surface, the pumping power, and the Nusselt number distributions were obtained. The results indicated that the effects of Rej and Ø on the flow field and heat transfer performance were magnified due to the interaction between them. A flow separation emerged near the dimple edge and got smaller with increase in Rej. The changes of three high vorticity magnitude zones in the confined domain depended on the variation of Rej and Ø. The regularity of change in the Nusselt number was complex and the physical properties of the working substance had great effect on it. Furthermore, the concept map of the flow structures of nanofluids in confined impingement and correlations have been derived from the parameter analysis.


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