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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.2017017578
pages 1237-1262

CONVERGENCE ANGLES EFFECT ON HEAT TRANSFER CHARACTERISTICS IN A WEDGED DUCT WITH DIMPLES/PROTRUSIONS

Lei Luo
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
Wei Du
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
Fengbo Wen
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
Songtao Wang
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
Zhiqi Zhao
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

Краткое описание

In this study, numerical simulations are performed to investigate the effects of convergence angle on the flow structure, end-wall heat transfer, and friction factor in a wedged duct with dimples/protrusions. The convergence angles are set as 0°, 6.3°, and 12.5°, respectively. The end wall of the wedged duct is arranged with dimples or protrusions in staggered layout. The normalized depth of a dimple/protrusion is set as 0.2. The Reynolds number is between 8,500 and 60,000. Results for the flow field, end-wall heat transfer, and friction factor are considered. The results show that the increase in the convergence angle introduces a pressure gradient pointing from the wedged duct top to the end-wall side. Thus, the flow impingement and flow acceleration are increased, while the flow recirculation is decreased. On the other hand, the secondary edge vortex in the wedged duct with dimples is also increased as the convergence angle increases, which contributes to the heat transfer augmentation. For the wedged duct with protrusions, the increase in the convergence angle enhances the local heat transfer by intensifying the leading edge impingement. However, the flow structure in the duct with protrusions does not change so remarkably as in the dimpled duct. It is also found that the increase in the convergence angle significantly increases the friction factor with moderate heat transfer augmentation. The thermal performance indicates that the large convergence angle reduces the thermal performance remarkably. The value is reduced from 1.7 to 1.35 as the convergence angle increases.


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