Application of Rayleigh-Ritz method to forced convection turbulent heat transfer

1981 ◽  
Vol 15 (2) ◽  
pp. 67-77
Author(s):  
L. A. Diaz ◽  
N. V. Suryanarayana
Keyword(s):  
Heat Transfer ◽  
Forced Convection ◽  
Ritz Method ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat

Turbulent Heat Transfer in a Revolving Square-Sectioned Tube

1980 ◽  
Vol 22 (2) ◽  
pp. 95-101 ◽  
Author(s):  
W. D. Morris ◽  
F. M. Dias
Keyword(s):  
Heat Transfer ◽  
Forced Convection ◽  
Convection Heat Transfer ◽  
Turbulent Heat Transfer ◽  
Electrical Machine ◽  
Turbulent Heat ◽  
Convection Heat ◽  
Forced Convection Heat Transfer ◽  
Parallel Axis ◽  
Correlating Equation

An investigation of turbulent heat transfer in a revolving square-sectioned tube is reported in this paper. It is demonstrated that rotation about a parallel axis enhances the customary forced convection heat transfer, and a correlating equation for assessing this effect is proposed. The range of parameters covered in the experiments permit the results to have application for the assessment of heat transfer in certain gas-cooled electrical machine rotors.

Forced Convection Air Cooling of Simulated Low Profile Electronic Components: Part 1—Base Case

1991 ◽  
Vol 113 (1) ◽  
pp. 21-26 ◽  
Author(s):  
G. L. Lehmann ◽  
J. Pembroke
Keyword(s):  
Heat Transfer ◽  
Forced Convection ◽  
Flow Rate ◽  
Turbulent Heat Transfer ◽  
Base Case ◽  
Air Cooling ◽  
Turbulent Heat ◽  
Electronic Components ◽  
Channel Spacing ◽  
Low Profile

Forced convection cooling of a simulated array of card-mounted electronic components has been investigated. An important feature of the simulated components is their relatively low profile (height/length = 0.058). Laboratory measurements of heat transfer rates resulting from convective air flow through a low aspect ratio channel are reported. The effect of variations in array position, channel spacing and flow rate is discussed. In the flow range considered laminar, transitional and turbulent heat transfer behavior have been observed. The behavior due to variations in flow rate and channel spacing is well correlated using a Reynolds number based on component length.

Studies of the Deteriorated Turbulent Heat Transfer Regime for the Gas-Cooled Fast Reactor Decay Heat Removal System

2006 ◽  
Author(s):  
Jeong Ik Lee ◽  
Pavel Hejzlar ◽  
Mujid S. Kazimi ◽  
Pradip Saha
Keyword(s):  
Heat Transfer ◽  
Forced Convection ◽  
Fast Reactor ◽  
Natural Circulation ◽  
High Surface ◽  
Heat Removal ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Convection Regime ◽  
Decay Heat

Increased reliance on passive emergency cooling using natural circulation of gas at elevated pressure is one of the major goals for the Gas-cooled Fast Reactor (GFR). Since GFR cores have high power density and low thermal inertia, the decay heat removal (DHR) in depressurization accidents is a key challenge. Furthermore, due to its high surface heat flux and low velocities under natural circulation in any post-LOCA scenario, three effects impair the capability of turbulent gas flow to remove heat from the GFR core, namely: (1) Acceleration effect (2) Buoyancy effect (3) Properties variation. This paper reviews previous work on heat transfer mechanisms and flow characteristics of the Deteriorated Turbulent Heat Transfer (DTHT) regime. It is shown that the GFR’s DHR system has a potential for operating in the DTHT regime by performing a simple analysis. A description of the MIT/INL experimental facility designed and built to investigate the DTHT regime is provided together with the first test results. The first runs were performed in the forced convection regime to verify facility operation against well-established forced convection correlations. The results of the three runs at Reynolds numbers 6700, 8000 and 12800 showed good agreement with the Gnielinsky correlation [4], which is considered the best available heat transfer correlation in the forced convection regime and is valid for a large range of Reynolds and Prandtl numbers. However, even in the forced convection regime, the effect of heat transfer properties variation of the fluid was found to be still significant.

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