Experimental Investigation and Numerical Modeling of Natural Convection Around an Infrared Montgolfiere Balloon at High Rayleigh Number

2012 ◽  
Author(s):  
G. Leplat ◽  
D. Donjat ◽  
P. Reulet ◽  
E. Laroche ◽  
P. Millan ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Numerical Modeling ◽  
Natural Convection ◽  
Rayleigh Number

An Experimental Investigation of Natural Convection From an Isothermal Horizontal Plate

1989 ◽  
Vol 111 (4) ◽  
pp. 904-908 ◽  
Author(s):  
A. M. Clausing ◽  
J. J. Berton
Keyword(s):  
Experimental Investigation ◽  
Natural Convection ◽  
Rayleigh Number ◽  
Richardson Number ◽  
Horizontal Plate ◽  
Convection Regime ◽  
Variable Property ◽  
Nusselt Number Correlation ◽  
Gas Medium ◽  
Large Rayleigh Number

An investigation of natural convection from a heated, upward-facing, square, horizontal plate to a surrounding gas medium is described in this paper. The results of the experimental investigation provide an improved correlation for the natural convection regime by accounting for variable property effects and extend the applicable Rayleigh number (Ra) range of the correlation over previous research. The large Rayleigh number regime is emphasized. The value of the Richardson number (Ri) at which combined convection influences become important is also determined. The ratio of the plate wall temperature Tw to the ambient temperature T∞ is incorporated into the Nusselt number correlation in order to account for variable property influences. A cryogenic heat transfer tunnel, with test section temperatures that are varied between 80 K and 310 K, is used to help deduce the influences of the relevant parameters. The ranges of the dimensionless parameters investigated are 2 × 108 < Ra < 2 × 1011 and 1 < Tw/T∞ < 3.1.

Natural Convection From Isothermal Cubical Cavities With a Variety of Side-Facing Apertures

1987 ◽  
Vol 109 (2) ◽  
pp. 407-412 ◽  
Author(s):  
A. M. Clausing ◽  
J. M. Waldvogel ◽  
L. D. Lister
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Natural Convection ◽  
Rayleigh Number ◽  
Radiative Heat ◽  
Side Wall ◽  
Large Temperature ◽  
Key Variables ◽  
Cryogenic Wind Tunnel ◽  
Large Rayleigh Number

An experimental investigation of heat transfer by natural convection from a smooth, isothermal cubic cavity with a variety of side-facing apertures is described in this paper. The study was motivated by the desire to predict the convective loss from large solar thermal-electric receivers and to understand the mechanisms which control this loss. Hence, emphasis is placed on the large Rayleigh number, Ra, regime with large ratios of the cavity wall temperature Tw to the ambient temperature T∞. A cryogenic wind tunnel with test section temperatures which are varied between 80 K and 310 K is used to facilitate deduction of the influences of the relevant parameters and to obtain large temperature ratios without masking the results by radiative heat transfer. A 0.4-m cubic cavity, which is mounted in the side wall of this tunnel, is used. The area of the aperture Aa and its location are key variables in this study. The data which are presented cover the ranges: 1 < Tw/T∞ < 3, L2/18 ≤ Aa ≤ L2, and 3 × 107 < Ra < 3 × 1010.

A NUMERICAL MODELING OF NATURAL CONVECTION AIR COOLING OF A BUTT-FUSION WELD

2019 ◽  
Author(s):  
Drake Norman ◽  
Todd Otanicar ◽  
Daniel W. Crunkleton ◽  
Amanda Hawkins
Keyword(s):  
Numerical Modeling ◽  
Natural Convection ◽  
Air Cooling ◽  
Fusion Weld
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