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Journal of Enhanced Heat Transfer
Fator do impacto: 0.562 FI de cinco anos: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN On-line: 1026-5511

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

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2018028268
pages 295-315

AEROTHERMAL CHARACTERISTICS OF A RECTANGULAR DUCT WITH PERIODIC TRAPEZIUM RIBS

Naveen Sharma
Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand-247667, India; Department of Mechanical Engineering, DVR & Dr. HS MIC College of Technology, Kanchikacherla, A.P.-521180, India
Andallib Tariq
Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand-247667, India
Manish Mishra
Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand-247667, India

RESUMO

An experimental investigation of aerothermal performance, and the underlying flow mechanism in a rectangular channel mounted with trapezium ribs, has been carried out at a Reynolds number of 42500. Transient Liquid Crystal Thermography (LCT) has been employed to get the local heat transfer coefficient (HTC) distributions on the rib turbulated wall. Primarily, the effects of trapezium angle (γ = 5,10,15, and 20°) and pitch ratio (p/e = 6, 8,10, and 12) have been studied on local- and spanwise averaged heat transfer fields. In addition, the performance indexes in terms of overall heat transfer enhancement factor, friction factor and overall performance factor have been compared, and found that most of the trapezium ribs (except γ = 10°) provide a better overall performance when compared to square rib (γ = 0°). However, the heat transfer characteristics are further correlated and explained by flow field quantities; i.e., ensemble averaged streamlines and mean velocities, critical flow structures, coherent structures, and fluctuation statistics, obtained by Particle Image Velocimetry (PIV) at a pitch ratio of 12. The variation in spatial distribution of thermal enhancement factor confirms the streak of reattachment, separations and recirculation bubble, which are closely related to the definable time-averaged flow structures; i.e., recirculation bubble, corner eddies, reattachment zone and the boundary layer redevelopment region. The simultaneous study of detailed aerothermal features gives confirmation with regards to the role of fluid dynamic factors in the heat transfer augmentation.

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