An Experimental Study of Heat Transfer During Forced Air Convection

2010 ◽  
Vol 20 (7) ◽  
pp. 1264-1270 ◽  
Author(s):  
Bowang Xiao ◽  
Gang Wang ◽  
Qigui Wang ◽  
Mohammed Maniruzzaman ◽  
Richard D. Sisson ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Air Convection ◽  
Forced Air

The Effect of Heat Transfer Area Roughness on Heat Transfer Enhancement by Forced Convection

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Jozef Cernecky ◽  
Jan Koniar ◽  
Zuzana Brodnianska
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Forced Convection ◽  
Holographic Interferometry ◽  
Temperature Fields ◽  
Heat Transfer Area ◽  
Transfer Enhancement ◽  
Nusselt Numbers ◽  
Air Convection ◽  
Forced Air

The paper deals with the visualization of temperature fields in the vicinity of profiled heat transfer surfaces and a subsequent analysis of local values of Nusselt numbers by forced air convection in an experimental channel. Holographic interferometry was used for visualizing the temperature fields. Experiments were carried out at Re 462 up to 2338 at the distances between heat transfer surfaces of 0.025 m and 0.035 m. Temperature contours were determined from the obtained images of holographic interferograms of temperature fields and the local values of Nusselt numbers along the profiled surface for x/s = 0 up to x/s = 1.25 were calculated from them. A significant effect of the profiled surface on the local values of Nusselt numbers can be observed from the obtained results.

The Experimental Study of Phase Transformation Heat─Transfer in Simulation of Grinding of Ti Alloy

2007 ◽  
Vol 359-360 ◽  
pp. 548-553
Author(s):  
Jia Long Ren ◽  
Wei Li ◽  
Hua Hang ◽  
Xiao Yan Guan
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Phase Transformation ◽  
Test Sample ◽  
Air Cooling ◽  
Ti Alloy ◽  
Apparent Mass ◽  
Jet Cooling ◽  
Forced Air ◽  
Positive Effect

Enhancing the cooling to spread heat in the process of the material cutting and milling has positive effect on increasing the efficiency of cutting and milling and assuring the apparent mass of test sample cut and milled. Basing on the experiment about the mixture of fixed pressure, fixed air and different quantity of water atomizing jet cooling the Ti alloy, this article discusses performance and regulation of phase transformation heat—transfer of simulating grinding Ti alloy forced air cooling by the mixture of fixed pressure, fixed air and little water.

Experimental study of thermohydraulic characteristics and irreversibility analysis of novel axial corrugated tube with spring tape inserts

2020 ◽  
Vol 92 (3) ◽  
pp. 30901
Author(s):  
Suvanjan Bhattacharyya ◽  
Debraj Sarkar ◽  
Ulavathi Shettar Mahabaleshwar ◽  
Manoj K. Soni ◽  
M. Mohanraj
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Thermal Performance ◽  
Working Fluid ◽  
The Novel ◽  
Heat Exchanger Tube ◽  
Heat Transfer Augmentation ◽  
Corrugated Tube ◽  
The Impact ◽  
Exchanger Tube

The current study experimentally investigates the heat transfer augmentation on the novel axial corrugated heat exchanger tube in which the spring tape is introduced. Air (Pr = 0.707) is used as a working fluid. In order to augment the thermohydraulic performance, a corrugated tube with inserts is offered. The experimental study is further extended by varying the important parameters like spring ratio (y = 1.5, 2.0, 2.5) and Reynolds number (Re = 10 000–52 000). The angular pitch between the two neighboring corrugations and the angle of the corrugation is kept constant through the experiments at β = 1200 and α = 600 respectively, while two different corrugations heights (h) are analyzed. While increasing the corrugation height and decreasing the spring ratio, the impact of the swirling effect improves the thermal performance of the system. The maximum thermal performance is obtained when the corrugation height is h = 0.2 and spring ratio y = 1.5. Eventually, correlations for predicting friction factor (f) and Nusselt number (Nu) are developed.

Experimental Study of Heat Transfer from Impinging Jet with Upstream and Downstream Crossflow

2010 ◽  
Vol 41 (8) ◽  
pp. 889-900 ◽  
Author(s):  
Daniel Thibault ◽  
Matthieu Fenot ◽  
Gildas Lalizel ◽  
Eva Dorignac
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Impinging Jet
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