An enclosure filled with blocks made of a microscale porous medium, separated by macrosize pores, can be treated as a bidisperse porous medium (BDPM) enclosure. This study investigates natural convection resonance inside such a BDPM enclosure subjected to time-periodic heat flux at a side wall, with the opposite wall kept isothermal while the top and bottom walls are adiabatic. The BDPM enclosure is made from uniformly spaced, disconnected, square, porous blocks that form the microporous medium saturated with a fluid of . For Rayleigh numbers, and , the pulsating wall heat flux is varied over a frequency range of , and the bidispersion effect is induced by varying both the internal (micropore) Darcy number and external (macropore) Darcy number . Natural convection resonance is observed in the BDPM enclosure and the resonance heating frequency increases with Ra, , and . However, of the BDPM enclosure is always less than that of the corresponding clear fluid enclosure limit (at ). Predictions of using a modified scale analysis incorporating BDPM effects agree well with that arrived by numerical methods.
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Resonance of Natural Convection Inside a Bidisperse Porous Medium Enclosure
Arunn Narasimhan,
Arunn Narasimhan
Associate Professor
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
e-mail: arunn@iitm.ac.in
Indian Institute of Technology
, Madras, Chennai 600036, India
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B. V. K. Reddy
B. V. K. Reddy
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
e-mail: bvkreddy680@gmail.com
Indian Institute of Technology
, Madras, Chennai 600036, India
Search for other works by this author on:
Arunn Narasimhan
Associate Professor
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
Indian Institute of Technology
, Madras, Chennai 600036, Indiae-mail: arunn@iitm.ac.in
B. V. K. Reddy
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
Indian Institute of Technology
, Madras, Chennai 600036, Indiae-mail: bvkreddy680@gmail.com
J. Heat Transfer. Apr 2011, 133(4): 042601 (9 pages)
Published Online: January 6, 2011
Article history
Received:
September 22, 2009
Revised:
January 27, 2010
Online:
January 6, 2011
Published:
January 6, 2011
Citation
Narasimhan, A., and Reddy, B. V. K. (January 6, 2011). "Resonance of Natural Convection Inside a Bidisperse Porous Medium Enclosure." ASME. J. Heat Transfer. April 2011; 133(4): 042601. https://doi.org/10.1115/1.4001316
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