Enhancement of Heat Transfer in Vertical Openended Channels in Natural Convection of Gas

2002 ◽  
Vol 33 (1-2) ◽  
pp. 5 ◽  
Author(s):  
Yu. F. Gortyshov ◽  
Igor A. Popov ◽  
V. V. Olimpiev ◽  
B. B. Kostylev
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Enhancement Of Heat Transfer

Numerical Simulations on Natural Convection From a Circular Cylinder in Oscillating Flows

2013 ◽  
Author(s):  
Yan Su
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Circular Cylinder ◽  
Heat Transfer Enhancement ◽  
Numerical Results ◽  
Transfer Enhancement ◽  
Oscillating Flows ◽  
Enhancement Of Heat Transfer ◽  
Buoyancy Forces ◽  
Laminar Convection

Natural convection from a circular cylinder in oscillating flows has been simulated by projection method with two dimensional exponential stretched staggered cylindrical meshes. Present numerical results are validated by comparing the heat transfer results of free convection over a circular cylinder to published experimental and numerical results. The effects of wave directions, amplitudes, frequencies and buoyancy forces on the enhancement of heat transfer have also been presented. Based on turning points of the curves of the overall Nusselt numbers versus Reynolds numbers, the heat transfer can be divided into three linear regimes (conduction, laminar convection and turbulent convection dominated regimes) and two non-linear transient regimes. The valid ranges of the governing parameters for heat transfer enhancement have been identified. The effects of wave directions, amplitudes, frequencies, and buoyancy forces on the enhancement of heat transfer are also investigated. The effective ranges of the governing parameters for heat transfer enhancement are identified.

Natural Convection Heat Transfer From Horizontal Rectangular Inverted Notched Fin Arrays

2009 ◽  
Vol 131 (8) ◽  
Author(s):  
Sanjeev D. Suryawanshi ◽  
Narayan K. Sane
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Heat Dissipation ◽  
Convection Heat Transfer ◽  
Average Heat Transfer Coefficient ◽  
Enhancement Of Heat Transfer ◽  
Computational Fluid Dynamics Analysis ◽  
Convection Cooling ◽  
Fin Spacing ◽  
Bottom Portion

The variables for natural convection cooling with the help of finned surfaces are orientation and geometry. In lengthwise short array (L/H∼5), where single chimney flow pattern is present, a stagnant zone is created at the central bottom portion of fin array channel and hence it does not contribute much in heat dissipation. Hence it is removed in the form of inverted notch at the central bottom portion of fin to modify its geometry for enhancement of heat transfer. An experimental setup is developed for studying the investigation on normal and inverted notched fin arrays (INFAs). Fin spacing, heater input, and percentage of area removed in the form of inverted notch are the parameters. For few spacing, it is verified by computational fluid dynamics analysis (Course Notes on Introduction to Commercial CFD of Tridiagonal Solutions, Pune), and the results are well matching. It is found that the average heat transfer coefficient for INFAs is nearly 30–40% higher as compared with normal array.

Whirlwind-Like Enhancement of Heat Transfer on Dimple Reliefs

2008 ◽  
Vol 39 (1) ◽  
pp. 79-90 ◽  
Author(s):  
S. A. Isaev ◽  
Alexander I. Leontiev ◽  
V. L. Zhdanov ◽  
N. Kornev ◽  
E. Hassel
Keyword(s):  
Heat Transfer ◽  
Enhancement Of Heat Transfer

Enhancement of Heat Transfer in a Short Rectangular Channel with Substantial Deflection of Inlet Velocity from Axial Direction

2005 ◽  
Vol 36 (4) ◽  
pp. 311-318 ◽  
Author(s):  
R. Bunker ◽  
M. YA. Belen'kii ◽  
M. A. Gotovskii ◽  
B. S. Fokin ◽  
S. A. Isaev
Keyword(s):  
Heat Transfer ◽  
Rectangular Channel ◽  
Axial Direction ◽  
Enhancement Of Heat Transfer ◽  
Inlet Velocity
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