A numerical study on the buoyancy effect around slanted-pin fins mounted on a vertical plate (Part-I: Laminar natural convection)

2019 ◽  
Vol 132 ◽  
pp. 731-744 ◽  
Author(s):  
Yeong Woong Oh ◽  
Yoon Suk Choi ◽  
Man Yeong Ha ◽  
June Kee Min
Keyword(s):  
Natural Convection ◽  
Vertical Plate ◽  
Numerical Study ◽  
Buoyancy Effect ◽  
Pin Fins ◽  
Laminar Natural Convection

scholarly journals Numerical Study of Laminar Natural Convection in an Arch Enclosure Filled with Al2O3-Water Based Nanofluid

2016 ◽  
Vol 9 (6) ◽  
pp. 1927-1936 ◽  
Author(s):  
Manoj Kumar Triveni ◽  
Dipak Sen ◽  
Rajsekhar Panua ◽  
◽  
◽  
...  
Keyword(s):  
Natural Convection ◽  
Numerical Study ◽  
Water Based ◽  
Laminar Natural Convection

Laminar Natural Convection in Isosceles Triangular Enclosures Heated From Below and Symmetrically Cooled From Above

2000 ◽  
Vol 122 (3) ◽  
pp. 485-491 ◽  
Author(s):  
G. A. Holtzman ◽  
R. W. Hill ◽  
K. S. Ball
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Numerical Study ◽  
Pitchfork Bifurcation ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Aspect Ratios ◽  
Triangular Enclosure ◽  
Laminar Natural Convection ◽  
Flow Symmetry

A numerical study of natural convection in an isosceles triangular enclosure with a heated horizontal base and cooled upper walls is presented. Nearly every previous study conducted on this subject to date has assumed that the geometric plane of symmetry is also a plane of symmetry for the flow. This problem is re-examined over aspect ratios ranging from 0.2 to 1.0 and Grashof numbers from 103 to 105. It is found that a pitchfork bifurcation occurs at a critical Grashof number for each of the aspect ratios considered, above which the symmetric solutions are unstable to finite perturbations and asymmetric solutions are instead obtained. Results are presented detailing the occurrence of the pitchfork bifurcation in each of the aspect ratios considered, and the resulting flow patterns are described. A flow visualization study is used to validate the numerical observations. Computed local and mean heat transfer coefficients are also presented and compared with results obtained when flow symmetry is assumed. Differences in local values of the Nusselt number between asymmetric and symmetric solutions are found to be more than 500 percent due to the shifting of the buoyancy-driven cells. [S0022-1481(00)02503-2]

The Basis for a Correction for Exponential Dependence of Viscosity on Temperature for Natural Convection by an Integral Method

2002 ◽  
Author(s):  
Louis C. Burmeister
Keyword(s):  
Boundary Layer ◽  
Natural Convection ◽  
Integral Method ◽  
Vertical Plate ◽  
Absolute Temperature ◽  
Exponential Dependence ◽  
Closed Form Solutions ◽  
Boundary Layer Equations ◽  
Corrective Term ◽  
Laminar Natural Convection

The Nusselt number for laminar natural convection is affected by the exponential dependence on inverse absolute temperature of the viscosity of some liquids, oil being a prime example. A common means of correcting for this effect is to multiply the correlation Nu = C Ra1/4 for constant properties by a factor (μ∞/μw)n to obtain Nu = C Ra1/4(μ∞/μw)n. That there is a sound basis for the form of this corrective term is shown by employing an integral method to obtain approximate, closed-form solutions to the laminar boundary layer equations for the case of a vertical plate of specified temperature to such a liquid.

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