Numerical investigation of laminar natural convection on a heated vertical plate subjected to a periodic oscillation

2004 ◽  
Vol 47 (19-20) ◽  
pp. 4439-4448 ◽  
Author(s):  
X.R. Zhang ◽  
S. Maruyama ◽  
S. Sakai
Keyword(s):  
Natural Convection ◽  
Numerical Investigation ◽  
Vertical Plate ◽  
Periodic Oscillation ◽  
Laminar Natural Convection

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.

Numerical Investigation of Natural Convection in a Square Enclosure with a Baffle Mounted on Vertical Wall

2015 ◽  
Vol 813-814 ◽  
pp. 748-753 ◽  
Author(s):  
N. Nagasubramanian ◽  
M.R. Thansekhar ◽  
M. Venkatesan ◽  
K. Ramanathan
Keyword(s):  
Natural Convection ◽  
Numerical Investigation ◽  
Average Nusselt Number ◽  
Vertical Wall ◽  
Temperature Fields ◽  
Cold Wall ◽  
Primary Vortex ◽  
Square Enclosure ◽  
Flow And Heat Transfer ◽  
Laminar Natural Convection

Results from numerical investigation of laminar natural convection inside a differentially heated square enclosure with a thin baffle attached to the cold wall are reported. The effect of the baffles on the flow and temperature fields were analyzed for baffle lengths equal to 20, 35 and 50 percent of the width of the enclosure, attached at three locations for Ra = 104, 105, 106 and Pr = 0.707. The presence of a baffle on the cold right wall affects the strength of the clockwise rotating primary vortex. Reduced flow and heat transfer are observed. Longer the baffle more pronounced the effect on the flow field. Secondary convection cells are seen between the baffle and the bottom wall for certain cases. Reduction in average Nusselt Number is observed on the cold wall with the baffle than the hot wall.

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