Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Heat Transfer Research
Facteur d'impact: 0.404 Facteur d'impact sur 5 ans: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

Volumes:
Volume 51, 2020 Volume 50, 2019 Volume 49, 2018 Volume 48, 2017 Volume 47, 2016 Volume 46, 2015 Volume 45, 2014 Volume 44, 2013 Volume 43, 2012 Volume 42, 2011 Volume 41, 2010 Volume 40, 2009 Volume 39, 2008 Volume 38, 2007 Volume 37, 2006 Volume 36, 2005 Volume 35, 2004 Volume 34, 2003 Volume 33, 2002 Volume 32, 2001 Volume 31, 2000 Volume 30, 1999 Volume 29, 1998 Volume 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019031072
Forthcoming Article

Effect of thermal buoyancy on flow past multiple cylinders in a vertical duct

Swaroop Sunil C
Indian Institute of Technology Madras
Shyama Prasad Das
Indian Institute of Technology Madras

RÉSUMÉ

This paper presents the numerical investigations on effect of thermal buoyancy (aiding or opposing) in flow past circular cylinders that are heated or cooled and kept in staggered configuration in a vertical duct. The change in heat transfer and flow characteristics is studied by varying the following parameters, like Richardson number (Ri), cylinder spacing (S) and Reynolds number (Re). Natural convection is modeled using the Boussinesq approximation. The study reveals that for certain Ri vortex shedding from the cylinder, that are placed behind, gets suppressed due to the change in flow patterns around the upstream cylinder. The critical Ri values were found to vary for different spacing indicating the influence of the channel walls in stabilizing the flow. The streamlines, vortex structures and isotherm patterns for different spacing (0.75, 1, 1.25), Ri (-4 to +4) and Re (100,180) are presented and discussed. Nusselt number (Nu) increases monotonically with Ri for middle cylinder with decreasing strength of opposing buoyancy whereas it degrades with decreasing strength of opposing buoyancy. There is monotonic increase in Nu with increasing strength of aiding buoyancy for all cylinders. Study also reveals that Nu and CD are strong functions of spacing and Re.