Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

Volume 27, 2020 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.v10.i2.50
pages 171-198

Flow and Heat Transfer in a Rectangular Duct with Single Rib and Two Ribs Mounted on the Bottom Surface

Andallib Tariq
Department of Mechanical Engineering, IIT, Kanpur 208 016, India
Kamlesh Singh
Department of Mechanical Engineering, IIT, Kanpur 208 016, India
Pradipta K. Panigrahi
Department of Mechanical Engineering, IIT Kanpur, Kanpur, India, 208016


An experimental investigation of fluid flow and heat transfer for a single rib and two ribs mounted on the bottom surface of a rectangular channel at Re of 13,400, 22,600, and 32,100 has been carried out. The pitch-to-rib height ratio set during the experiment is equal to 10, and rib-height-to-hydraulic-diameter ratio is equal to 0.0624. The mean velocity and its fluctuations from hot-wire anemometry, mean temperature and its fluctuation from resistance thermometry and the surface Nusselt number from transient liquid crystal thermography are presented. The Nusselt number results obtained from the transient LCT analysis satisfy the energy balance check and correlate well with that from the law of the wall. No large-scale structures are observed in the spanwise direction near the reattachment region showing the overall two-dimensional nature of the flow. The temperature fluctuation has two peaks in the near-field region: one peak at similar cross-stream location to that of the velocity fluctuations and the other close to the wall. The velocity and temperature fluctuation have a flatter distribution in the far-field region than in the near-field region, indicating that turbulence production is important in the near-field region, while other mechanisms such as dissipation, convection, and diffusion predominate in the far-field region. The entropy generation calculation revealed that the two-rib case at Re = 32,100 is most advantageous from the thermodynamic point of view, with a 16% drop in entropy generation and a 47% heat transfer augmentation.