Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110

Volumes:
Volume 47, 2020 Volume 46, 2019 Volume 45, 2018 Volume 44, 2017 Volume 43, 2016 Volume 42, 2015 Volume 41, 2014 Volume 40, 2013 Volume 39, 2012 Volume 38, 2011 Volume 37, 2010 Volume 36, 2009 Volume 35, 2008 Volume 34, 2007 Volume 33, 2006 Volume 32, 2005 Volume 31, 2004 Volume 30, 2003 Volume 29, 2002 Volume 28, 2001 Volume 27, 2000 Volume 26, 1999 Volume 25, 1998 Volume 24, 1997 Volume 23, 1996 Volume 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v37.i2.50
pages 162-177

Longitudinal Vortex Roll Structure in Model Horizontal MOCVD Processes

Jyh-Long Tuh
Department of Living Services Industry, Asia-Pacific Institute of Creativity Miaoli, Taiwan 35153, ROC
Hung-Ming Sung
Department of Mechanical Engineering, Hsiuping Institute of Technology Taichung, Taiwan

RÉSUMÉ

In this study experimental flow visualization combined with numerical simulation are conducted to explore the structure of the buoyancy driven longitudinal vortex rolls in mixed convective air flow through a horizontal flat duct with an isothermally heated circular disk embedded in the bottom plate, simulating that in a horizontal longitudinal MOCVD reactor. How this particular geometry of the circular heated surface affects the longitudinal vortex flow characteristics is investigated in detail. The results indicate that at a low buoyancy-to-inertia ratio with moderate Reynolds number, regular longitudinal vortices prevail in the duct core right above the second half of the heated disk and the asymmetric vortex rolls are generated in different size and shape. The vortex structure of the longitudinal rolls can persist to some distance well into the region downstream of the circular plate except in the region near the disk edge the decay of the longitudinal rolls is substantial. The vortex flow do not become fully developed and the onset points of the vortex rolls all land on the circular heated surface to take shape a concave downward curve in the streamwise direction. Besides, a two-layer structure is observed at both sides close to the exit of the test section and it contains a pair of rolls with nearly half a height of the duct. More specifically the vortex rolls in this two-layer structure both rotate in the same direction.


Articles with similar content:

TRANSVERSE VORTEX ROLLS IN MIXED CONVECTIVE AIR FLOW DRIVEN BY A HEATED CIRCULAR PLATE EMBEDDED IN THE BOTTOM OF A HORIZONTAL FLAT DUCT
Journal of Flow Visualization and Image Processing, Vol.13, 2006, issue 1
Jyh-Long Tuh
FORMATION OF RETURN FLOWS IN MIXED CONVECTIVE GAS FLOW OVER A MODEL HEATED SUBSTRATE
Journal of Flow Visualization and Image Processing, Vol.12, 2005, issue 3
Jyh-Long Tuh
OBSERVATION OF THERMALS IN MIXED CONVECTIVE GAS FLOW OVER A MODEL HEATED SUBSTRATE
Journal of Flow Visualization and Image Processing, Vol.15, 2008, issue 4
Jyh-Long Tuh
EFFECTS OF THE SIZE OF HEAT SOURCE ON NATURAL CONVECTION IN HORIZONTAL POROUS LAYERS HEATED FROM BELOW
International Heat Transfer Conference 8, Vol.5, 1986, issue
F. A. Kulacki, V. Prasad
Numerical Investigation on Conjugated Heat Transfer of Conduction in Wall and Mixed Convection in Horizontal Square Tube with Molten Salts
International Heat Transfer Conference 15, Vol.36, 2014, issue
Yuting Wu, Bin Liu, Chong Fang Ma, Chao Wang, Cong Chen