Experimental study of the effects of structured surface geometry on water spray cooling performance in non-boiling regime

doi:10.1007/s11708-010-0014-0

Front Energ

2011, Vol. 5

Issue (1) : 75-82 https://doi.org/10.1007/s11708-010-0014-0

RESEARCH ARTICLE

Experimental study of the effects of structured surface geometry on water spray cooling performance in non-boiling regime

Minghou LIU(

), Yaqing WANG, Dong LIU, Kan XU, Yiliang CHEN

Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China

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Abstract

Experiments were conducted to study the effects of enhanced surfaces on heat transfer performance during water spray cooling in non-boiling regime. The surface enhancement is straight fin. The structures were machined on the top surface of heated copper blocks with a cross-sectional area of 10 mm×10 mm. The spray was performed using Unijet full cone nozzles with a volumetric flux of 0.044–0.053 m³/(m²·s) and a nozzle height of 17 mm. It is found that the heat transfer is obviously enhanced for straight fin surfaces relative to the flat surface. However, the increment decreases as the fin height increases. For flat surface and enhanced surfaces with a fin height of 0.1 mm and 0.2 mm, as the coolant flux increases, the heat flux increases as well. However, for finned surface with a height of 0.4 mm, the heat flux is not sensitive to the coolant volumetric flux. Changed film thickness and the form of water/surface interaction due to an enhanced surface structure (different fin height) are the main reasons for changing of the local heat transfer coefficient.

Keywords spray cooling finned surface heat transfer

Corresponding Author(s): LIU Minghou,Email:mhliu@ustc.edu.cn

Issue Date: 05 March 2011

Cite this article:

Minghou LIU,Yaqing WANG,Dong LIU, et al. Experimental study of the effects of structured surface geometry on water spray cooling performance in non-boiling regime[J]. Front Energ, 2011, 5(1): 75-82.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-010-0014-0
https://academic.hep.com.cn/fie/EN/Y2011/V5/I1/75

Fig.1 Experimental setup

Fig.2 Schematic diagram of heat-target

Fig.3 Schematic diagram of simulated temperature

Tab.1 Parameters of nozzles atomization

Fig.4 Enhanced surfaces
(a) CCD image; (b) Geometry of enhanced surface

Tab.2 Dimensions of surfaces

Fig.5 Heat flux as a function of surface temperature and water volumetric flux
(a) Flat surface; (b) straight-finned surface with a height of 0.1 mm; (c) straight-finned surface with a height of 0.2 mm; (d) straight-finned surface with a height of 0.4 mm

Fig.6 Heat flux as a function of surface temperature and channel height
(a)=0.044 m/(m·s); (b)=0.049 m/(m·s); (c)=0.053 m/(m·s)

Tab.3 Effects of surface structure on heat flux (surface temperature =50°C)
unit: %

Tab.4 / for enhanced structures

Fig.7 Heat transfer coefficient as a function of surface temperature and channel height for different volumetric flux
(a) =0.044 m/(m·s), (b) =0.049 m/(m·s)

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