Experimental study of convective heat transfer from a rotating finned tube in transverse air flow

2000 ◽  
Vol 29 (1) ◽  
pp. 79-90 ◽  
Author(s):  
B. Watel ◽  
S. Harmand ◽  
B. Desmet
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Air Flow ◽  
Finned Tube

Numerical and Experimental Study of Flow and Convective Heat Transfer on a Rotor of a Discoidal Machine with Eccentric Impinging Jet

2019 ◽  
pp. 1-29
Author(s):  
Chadia Haidar ◽  
Rachid Boutarfa ◽  
Mohamed Sennoune ◽  
Souad Harmand
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Steady State ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Air Flow ◽  
Impinging Jet ◽  
Rotating Disk ◽  
Reynolds Numbers ◽  
Air Jet

This work focuses on the numerical and experimental study of convective heat transfer in a rotor of a discoidal the machine with an eccentric impinging jet. Convective heat transfers are determined experimentally in steady state on the surface of a single rotating disk. The experimental technique is based on the use of infrared thermography to access surface temperature measurement, and on the numerical resolution of the energy equation in steady-state, to evaluate local convective coefficients. The results from the numerical simulation are compared with heat transfer experiments for rotational Reynolds numbers between 2.38×105 and 5.44×105 and for the jet's Reynolds numbers ranging from 16.5×103 to 49.6 ×103. A good agreement between the two approaches was obtained in the case of a single rotating disk, which confirms us in the choice of our numerical model. On the other hand, a numerical study of the flow and convective heat transfer in the case of an unconfined rotor-stator system with an eccentric air jet impinging and for a dimensionless spacing G=0.02, was carried out. The results obtained revealed the presence of different heat transfer zones dominated either by rotation only, by the air flow only or by the dynamics of the rotation flow superimposed on that of the air flow. Critical radii on the rotor surface have been identified

Experimental Study of Convective Heat Transfer in Pulsating Air Flow inside Circular Pipe

2007 ◽  
pp. 880-885 ◽  
Author(s):  
Hua Li ◽  
Yingjie Zhong ◽  
Xuemei Zhang ◽  
Kai Deng ◽  
Haihao Lin ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Air Flow ◽  
Circular Pipe

Experimental Study on Convective Heat Transfer of Radial Air Flow in Rotating Multi-Channels

1995 ◽  
Author(s):  
G. J. Hwang ◽  
C. R. Kuo ◽  
C. Y. Chang
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Air Flow ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Cross Sectional ◽  
Transfer Measurement ◽  
Single Flow

Experimental study on the convective heat transfer of radial air flow in rotating multi-channels was performed. Three sets of test sections, one single-flow passage, one nine-flow passages and one twenty-five-flow passages with the same cross sectional area of 9π mm2, were applied to the experiments. The test section was formed by rectangular blocks of aluminum alloy with circular flow passages. Between two adjacent blocks, a Bakelite board of 1 mm thickness was placed to separate axial wall heat conduction for local heat transfer measurement. The parameters involved are the Reynolds number Re, the Rotation number Ro, the Buoyancy parameter Gr/Re2, and the ratio of the heat transfer area Ap/Ac. The heat transfer results of radially rotating circular ducts based on per-passage and per-system were obtained.

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