NATURAL CONVECTION HEAT TRANSFER NEAR A VERTICAL WALL WITH FINITE CAPACITY

2009 ◽  
Author(s):  
Jean-Jacques Roux ◽  
Frederic Kuznik ◽  
Damien David
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Vertical Wall ◽  
Convection Heat Transfer ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Finite Capacity

Natural Convection From Interrupted Vertical Walls

2014 ◽  
Vol 136 (11) ◽  
Author(s):  
Mehran Ahmadi ◽  
Golnoosh Mostafavi ◽  
Majid Bahrami
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Analytical Study ◽  
Vertical Wall ◽  
Convection Heat Transfer ◽  
Effective Length ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Vertical Walls ◽  
Compact Relationship

Steady-state external natural convection heat transfer from interrupted rectangular vertical walls is investigated. A systematic numerical, experimental, and analytical study is conducted on the effect of adding interruptions to a vertical plate. Comsol multiphysics is used to develop a two-dimensional numerical model for investigation of fin interruption effects on natural convection. A custom-designed testbed is built and six interrupted wall samples are machined from aluminum. An effective length is introduced for calculating the natural convection heat transfer from interrupted vertical walls. Performing an asymptotic analysis and using a blending technique, a new compact relationship is proposed for the Nusselt number. Our results show that adding interruptions to a vertical wall can enhance heat transfer rate up to 16% and reduce the weight of the fins, which in turn, lead to lower manufacturing and material costs.

scholarly journals Natural convection heat transfer around a horizontal circular cylinder near an isothermal vertical wall

2018 ◽  
Vol 180 ◽  
pp. 02077
Author(s):  
Marcel Novomestský ◽  
Richard Lenhard ◽  
Ján Siažik
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Circular Cylinder ◽  
Vertical Wall ◽  
Convection Heat Transfer ◽  
Side Wall ◽  
Horizontal Cylinder ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Heated Cylinder

Natural convection heat transfer from a single horizontal cylinder near an isothermal wall is experimentally investigated in the environmental chamber. When cylinder is heated the plume rising from the heated cylinder interacts with the wall and significantly affects the surface heat transfer distribution. Thus, the distance between horizontal cylinder and side wall can influence the heat transfer. The heat transfer from heated cylinder with different distances was compared. It was found that the influence of the wall on the convection heat transfer from the circular cylinder began when the distance between the wall and cylinder is less than 80 mm.

scholarly journals Natural Convection Heat Transfer Around a Horizontal Circular Cylinder for the Case of Constant Surface Temperature of the Cylinder Near a Vertical Wall

2018 ◽  
Vol 168 ◽  
pp. 02002
Author(s):  
Marcel Novomestsky ◽  
Roman Banovčan ◽  
Andrej Kapjor ◽  
Helena Smatanová
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Natural Convection ◽  
Vertical Wall ◽  
Convection Heat Transfer ◽  
Side Wall ◽  
Horizontal Cylinder ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Heated Cylinder

Natural convection heat transfer from a single horizontal cylinder near an isothermal wall is experimentally investigated in the environmental chamber. The cylinder is heated with constant temperature, the rising plum from the heated cylinder interacts with the side wall and significantly affects the surface heat transfer distribution. Thus, the distance between horizontal cylinder and side wall can influence the heat transfer. The heat transfer from heated cylinder with different distances were compared. Results are obtained for Ra = 104. It was found that natural convection heat transfer from horizontal cylinder depends on the distance between wall. Also, a heat transfer correlation has been proposed for a single horizontal cylinder near a wall and is compared with earlier work. The results indicate that the vertical wall affect the average Nusselt number at the cylinder. Therefore, the vertical wall has a positive effect on the Nusselt number at the cylinder.

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