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Journal of Enhanced Heat Transfer
Импакт фактор: 0.562 5-летний Импакт фактор: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Печать: 1065-5131
ISSN Онлайн: 1026-5511

Выпуски:
Том 26, 2019 Том 25, 2018 Том 24, 2017 Том 23, 2016 Том 22, 2015 Том 21, 2014 Том 20, 2013 Том 19, 2012 Том 18, 2011 Том 17, 2010 Том 16, 2009 Том 15, 2008 Том 14, 2007 Том 13, 2006 Том 12, 2005 Том 11, 2004 Том 10, 2003 Том 9, 2002 Том 8, 2001 Том 7, 2000 Том 6, 1999 Том 5, 1998 Том 4, 1997 Том 3, 1996 Том 2, 1995 Том 1, 1994

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v12.i4.40
pages 343-355

Experimental Study of the Effects of Rib Angle and Discretization on Heat Transfer and Friction in an Asymmetrically Heated Rectangular Duct

Rajendra Karwa
Department of Mechanical Engineering, Faculty of Engineering and Architecture, Jai Narain Vyas University, Jodhpur 342 011, India
R. D. Bairwa
Department of Mechanical Engineering, Faculty of Engineering, Jai Narain Vyas University, Jodhpur 342 011, India
B. P. Jain
Department of Mechanical Engineering, Faculty of Engineering, Jai Narain Vyas University, Jodhpur 342 011, India
Nitin Karwa
Department of Mechanical Engineering, Indian Institute of Technology, Delhi 110 016, India

Краткое описание

The paper presents results of an experimental investigation of heat transfer and friction in a high-aspect-ratio rectangular duct with repeated rectangular cross-section ribs on one broad wall in v-discrete and discontinuous patterns at different angles. The ribs have been arranged in both v-up and v-down patterns. The flow and thermal boundary conditions correspond closely to those of solar air heater ducts. Over the range of the Reynolds number studied, the Stanton number and friction factor values for the roughened ducts are 1.56−2.21 and 1.65−2.93 times of the values for the smooth duct, respectively. Thermal performance comparison of different rib patterns, based on equal pumping power for roughened and smooth ducts, shows that 60° v-discrete ribs with a relative roughness length of 6 gives 4−18%, 14−27%, and about 3−5% better performance than the 45° v-discrete ribs, discontinuous ribs, and 60° discrete ribs with a relative roughness length of 3, respectively. The performance of the v-down arrangement of ribs is better than v-up arrangement for all cases studied. The friction factor and heat-transfer coefficient correlations have been developed for the most preferred type of roughness.


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