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Heat Transfer Research
Импакт фактор: 0.404 5-летний Импакт фактор: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

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

Краткое описание

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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