Header menu link for other important links
X
Analysis of differential versus Rayleigh–Bénard heating via heat flow visualization for thermal convection due to heating at enclosures with concave/convex walls
Pratibha Biswal,
Published in Taylor and Francis Ltd.
2018
Volume: 73
   
Issue: 12
Pages: 823 - 848
Abstract
Natural convection within enclosures in the presence of isothermal curved walls involving (a) differential heating and (b) Rayleigh–Bénard heating is considered for investigation. The two heating strategies are compared based on the distributions of fluid flow, heat flow and local or average heat transfer rates for various Dam (modified Darcy number) and Prm (modified Prandtl number) at the high Ram (modified Rayleigh number). Unidirectional circulation cells occur for differential heating whereas four (combination of clockwise and anticlockwise) circulation cells occur for Rayleigh–Bénard heating. Consequently, unidirectional heatline cell occurs at the center for differential heating and four heatline circulation cells occur for Rayleigh–Bénard heating specially at the high (Formula presented.). Multiple heatline cells lead to larger thermal mixing for Rayleigh–Bénard heating. The heat transfer rate is larger for differential heating case and the percentage enhancement of Nusselt number is calculated in terms of the gain in heat transfer rate for differential heating (E). The gain in heat transfer rate in terms of E involving concave and convex cavities (cases 1 and 2) is found to be the strong function of Dam and Prm at the high Ram. © 2018, © 2018 Taylor & Francis.
About the journal
JournalData powered by TypesetNumerical Heat Transfer; Part A: Applications
PublisherData powered by TypesetTaylor and Francis Ltd.
ISSN10407782
Open AccessNo
Concepts (15)
  •  related image
    Cells
  •  related image
    Cytology
  •  related image
    Enclosures
  •  related image
    Flow of fluids
  •  related image
    Natural convection
  •  related image
    Prandtl number
  •  related image
    Average heat transfers
  •  related image
    DARCY NUMBER
  •  related image
    DIFFERENTIAL HEATING
  •  related image
    Heat transfer rate
  •  related image
    Heating strategy
  •  related image
    MODIFIED RAYLEIGH
  •  related image
    THERMAL CONVECTIONS
  •  related image
    THERMAL MIXING
  •  related image
    Heating