Experimental and Theoretical Study on the Thermal Characteristics of Flashing Spray Cooling UsingR404a

2014 ◽  
Author(s):  
Zhi-Fu Zhou ◽  
Bin Chen ◽  
Guo-Xiang Wang
Keyword(s):  
Theoretical Study ◽  
Thermal Characteristics ◽  
Spray Cooling

Fundamental Study on Thermal Characteristics of Heat Spreaders

2011 ◽  
Author(s):  
Yasushi Koito ◽  
Yusaku Nonaka ◽  
Toshio Tomimura
Keyword(s):  
Thermal Management ◽  
Theoretical Study ◽  
Thermal Characteristics ◽  
Thermal Design ◽  
Design Parameters ◽  
Heat Spreader ◽  
Fundamental Study ◽  
Discharge Characteristics ◽  
Heat Spreaders ◽  
Large Heat

A heat spreader is one of the solutions for thermal management of electronic and photonic systems. By placing the heat spreader between a small heat source and a large heat sink, the heat flux is spread from the former to the latter, resulting in a lower thermal spreading resistance between them. There are many types of heat spreaders known today having different heat transfer modes, shapes and sizes. This paper describes the theoretical study to present the fundamental data for the rational use and thermal design of heat spreaders. Two-dimensional disk-shaped mathematical model of the heat spreader is constructed, and the dimensionless numerical analysis is performed to investigate the thermal spreading characteristics of the heat spreaders. From the numerical results, the temperature distribution and the heat flow inside the heat spreaders are visualized, and then the effects of design parameters are clarified. The discussion is also made on the discharge characteristics of the heat spreaders. Moreover, a simple equation is proposed to evaluate the heat spreaders.

Power Plant Spray Cooling: Design and Performance Studies

1985 ◽  
Vol 107 (3) ◽  
pp. 582-589 ◽  
Author(s):  
S. J. Palaszewski ◽  
S. Weinbaum ◽  
L. M. Jiji
Keyword(s):  
Performance Studies ◽  
Three Dimensional ◽  
Thermal Characteristics ◽  
Local Variation ◽  
Power Input ◽  
Spray Cooling ◽  
Three Dimensional Model ◽  
Air Velocity ◽  
Cooling Design ◽  
And Performance

A new three-dimensional model for determining the flow and thermal characteristics of spray units is utilized in an effort to predict and improve the cooling efficiency of spray units. In a marked departure from present theories, which are based on the behavior of an average droplet in a uniform average environment, the model examines the local variation in properties of both the air and the droplets throughout the flow field encompassing the spray umbrella. Model predictions of droplet return temperature along the spray perimeter, downwind wet-bulb temperature, and downwind air-velocity were compared with field data on a commercial spray. Good agreement was observed. A parametric study was then performed to determine the optimum droplet size and discharge angle for a spray unit. It was found that substantial improvements in the cooling obtained for a given spray power input can be achieved over currently used floating spray units.

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