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Keywords: Rayleigh number
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Journal Articles
Article Type: Research-Article
J. Heat Transfer. September 2022, 144(9): 092601.
Paper No: HT-22-1114
Published Online: June 21, 2022
... differential equations (continuity, momentum, and energy) numerically over wide ranges of the relevant dimensionless parameters, namely, Rayleigh number, 10 4 ≤ Ra ≤ 10 8 ; and height to diameter ratio, 0.15 ≤ h/D ≤ 0.95. The detailed behavior of thermal and flow fields is delineated by suitable visualization...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. February 2020, 142(2): 022601.
Paper No: HT-19-1016
Published Online: January 6, 2020
...Omprakash S. Bharti; Devesh Rajan; Arun K. Saha; Malay K. Das The present research proposes an inverse natural convection algorithm for simultaneous estimation of correct values of Prandtl number (Pr) and Rayleigh number (Ra). The inverse problem is formulated as the minimization of appropriate...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. December 2019, 141(12): 122504.
Paper No: HT-19-1129
Published Online: October 8, 2019
... number sidewall conductance fin model Rayleigh-Bénard convection (i.e., free convective heat transfer through a horizontal layer of fluid, heated from below and cooled from above) for moderate to high Rayleigh numbers (10 6 –10 12 ) is of significant interest to researchers in various fields...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. December 2013, 135(12): 122501.
Paper No: HT-12-1495
Published Online: October 14, 2013
... (Bn), Rayleigh number (Ra), and Prandtl number (Pr). It has been observed that with the increase in Bingham number, the buoyancy induced fluid circulation and convection effect decreases inside the enclosure. For each Rayleigh number, there correspond a critical Bingham number for which the heat...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. December 2012, 134(12): 122504.
Published Online: December 8, 2012
... to constant wall heat flux (CHWF) are studied numerically. To complement the simulations, a scaling analysis is also performed to elucidate the anticipated effects of Rayleigh number (Ra), Prandtl number (Pr) and power-law index (n) on the Nusselt number. The effects of n in the range 0.6 ≤ n ≤ 1.8...
Journal Articles
Article Type: Heat And Mass Transfer
J. Heat Transfer. September 2012, 134(9): 092001.
Published Online: June 29, 2012
... been obtained in the form of series expansions in terms of a thermal Rayleigh number, which is based on the temperature of the heated sphere and the medium permeability. The results are exemplified by drawing the streamlines at various times. Of special significance is the emergence of a downward flow...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. November 2010, 132(11): 112601.
Published Online: August 13, 2010
... with vibration when g ∗ = ω ∗ 2 X 0 ∗ . The analysis for the large Vadasz number scaling indicates that a frozen time approximation is appropriate where the effect of vibration is modeled as small variations in the Rayleigh number definition. 09 04 2010 07 06 2010 13 08 2010 13 08 2010...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. May 2008, 130(5): 052601.
Published Online: April 10, 2008
... modulation and vertical magnetic field on thermal instability has been studied. The correction in the critical Rayleigh number is calculated as a function of frequency of modulation, Darcy number, Darcy Chandrasekhar number, magnetic Prandtl number, and the nondimensional group number χ . The influence...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. June 2007, 129(6): 697–704.
Published Online: September 12, 2006
.... However, for large volume fraction ϕ > 2 % , the convective heat transfer coefficient declines due to reduction in the Rayleigh number caused by increase in kinematic viscosity. Also, an empirical correlation for Nu ϕ as a function of ϕ and Ra has been developed, and it is observed...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. July 2007, 129(7): 835–843.
Published Online: July 12, 2006
... of the critical Rayleigh number is calculated as function of amplitude and frequency of modulation, Chandrasekhar number, Taylor number, porous parameter, Prandtl number, and magnetic Prandtl number. It is found that rotation, magnetic field, and porous medium all have a stabilizing influence on the onset...