Experimental investigation of TiO2/Water nanofluid effects on heat transfer characteristics of a vertical annulus with non-uniform heat flux in non-radiation environment

2014 ◽  
Vol 69 ◽  
pp. 7-13 ◽  
Author(s):  
Yasser Abbassi ◽  
Mansour Talebi ◽  
Amir Saeed Shirani ◽  
Jamshid Khorsandi
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Experimental Investigation ◽  
Radiation Environment ◽  
Uniform Heat Flux ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Uniform Heat ◽  
Vertical Annulus

Effect of Swirl Intensity on Heat Transfer Characteristics of Swirling Flame Impinging on a Flat Surface

2013 ◽  
Author(s):  
Gurpreet Singh ◽  
Subhash Chander
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Stagnation Point ◽  
Flat Surface ◽  
Operating Conditions ◽  
Uniform Heat Flux ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Swirl Intensity ◽  
Swirling Flame

An experimental investigation has been carried out to determine the effect of swirl intensity on heat transfer characteristics of swirling flame impinging on a flat surface. The swirl intensity was varied by using helical vane swirlers having angles of 15°, 30° and 60° (low, medium and high swirl). Qualitative flame structures were studied by taking direct photographs of impinging flames. Experiments were conducted for different helical vane swirlers at different dimensionless separation distances (H/d = 1–6) for fixed value of Reynolds number (Re = 5000) and equivalence ratio (ϕ = 1.0). A dip in heat flux was observed at stagnation point for all levels of swirl. Peak heat flux was observed slightly away from the stagnation point due to centrifugal effect. A comparison of stagnation point heat flux has been done for different swirl intensities and for fixed operating conditions. Most uniform heat flux distribution was obtained corresponds to 30° helical vane swirler (medium swirl) at all separation distances.

Heat Transfer Characteristics of a Liquid-Metal Filled Closed Thermosyphon

1972 ◽  
Vol 94 (3) ◽  
pp. 202-206 ◽  
Author(s):  
P. F. Pucci ◽  
J. C. R. Gerretsen
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Liquid Metal ◽  
Uniform Heat Flux ◽  
Heat Transfer Characteristics ◽  
Constant Wall Temperature ◽  
Sodium Potassium ◽  
Transfer Characteristics ◽  
Wall Boundary Conditions ◽  
Existing Data

Experimentally determined heat transfer characteristics are presented for two geometrically similar, closed thermosyphons. Results using water, mercury, and the sodium-potassium eutectic, NaK 56/44, were obtained for two hot wall boundary conditions, namely, constant wall temperature and uniform heat flux. The water filled thermosyphon data were correlated over a range of td = GrdPr (d/Lh) from 5 × 104 to 1.3 × 107, which agrees with and extends existing data. The liquid-metal filled thermosyphon data were correlated over a range of GrdPr2 from 3. × 102 to 2. × 105.

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