LHP heat transfer performance: A comparison study about sintered copper powder wick and copper mesh wick

2016 ◽  
Vol 92 ◽  
pp. 104-110 ◽  
Author(s):  
Yiwei Wang ◽  
Jiwen Cen ◽  
Fangming Jiang ◽  
Wenjiong Cao ◽  
Jian Guo
Keyword(s):  
Heat Transfer ◽  
Copper Powder ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Comparison Study ◽  
Sintered Copper ◽  
Copper Mesh

Comparative Analysis of Heat Transfer Characteristics for CO2 and Conventional Refrigerants

2011 ◽  
Vol 130-134 ◽  
pp. 1306-1309
Author(s):  
Jun Lan Yang ◽  
Yi Tai Ma ◽  
Min Xia Li
Keyword(s):  
Heat Transfer ◽  
Liquid Film ◽  
Heat Transfer Performance ◽  
Quantitative Comparison ◽  
Condensation Heat Transfer ◽  
Condensation Process ◽  
Transfer Performance ◽  
Comparison Study ◽  
Cooling Process ◽  
Thermo Physical Properties

s: The obvious characteristics of transcritical CO2 cycle are that the heat rejection process takes place in the supercritical region (about 8-12Mpa). The heat transfer features of CO2 under supercritical pressure are different from those of the conventional refrigerants. And the heat transfer performances comparison study for supercritical CO2 fluid and the conventional refrigerants are carried out by means of thermo-physical properties analog analysis and experimental results quantitative comparison. The special properties variation of supercritical CO2 fluid makes its heat transfer performance different from the conventional fluids. From the view of properties analysis and quantitative comparison, the heat transfer performance of supercritical CO2 is equivalent to the condensation heat transfer of conventional refrigerants. Although the condensation coefficient is very large since there is phase change and latent heat variation in the condensation process, there is liquid film thermal resistance. While in the supercritical CO2 cooling process, there is no liquid film in existence and the thickness of the boundary layer is very thin. The heat transfer temperature difference is very large, so the heat transfer performance in the supercritical CO2 cooling process is equivalent to that of the condensation heat transfer.

scholarly journals Study on Heat Transfer Performance of Non-integral Capillary Core Sintered Uniform Plate

2021 ◽  
Vol 7 (5) ◽  
pp. 292-301
Keyword(s):  
Heat Transfer ◽  
Particle Size ◽  
Heat Source ◽  
Thermal Resistance ◽  
Copper Powder ◽  
Heat Transfer Performance ◽  
Copper Plate ◽  
Transfer Performance ◽  
Filling Rate ◽  
Large Particle Size

This paper mainly introduces the sintering process of the monolithic capillary wick and analyzes the influence of different copper powder particle size, filling rate, copper powder shape and heat source size on the heat transfer performance of the isothermal plate. The experimental results show that: (1) For the isothermal plate sintered with spherical copper powder, the capillary force of large particle size copper powder is small, but the flow resistance is also small, and the performance of the isothermal plate sintered with large particle size copper powder is better. (2) In the case of low filling rate, the isothermal plate is dried due to insufficient return fluid. In the case of high filling rate, on the one hand, the thickness of the liquid film at the evaporation end of the isothermal plate is large, resulting in additional thermal resistance. On the other hand, the thin film evaporation mode will be transformed into pool boiling mode, which will reduce the heat transfer performance. (3) Spherical copper powder sintered plate with regular shape has the best performance, while dendritic copper powder sintered plate has relatively high thermal resistance. (4) The heat source area has a great influence on the thermal resistance of the plate. Under the same heating power, the thermal resistance of the small area heat source is much higher than that of the large area heat source; The thermal resistance of sintered copper plate is lower than that of pure copper plate under two heat source areas.

Evaporation/Boiling Heat Transfer Performance in a Sintered Copper Mesh Structure

2014 ◽  
Vol 136 (8) ◽  
Author(s):  
Y. H. Diao ◽  
Y. Liu ◽  
Y. H. Zhao ◽  
S. Wang
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Heat Transfer Performance ◽  
Mesh Size ◽  
Experimental Results ◽  
Operating Pressure ◽  
Transfer Performance ◽  
Mesh Structure ◽  
Wick Structure ◽  
Copper Mesh

In this study, experimental investigations regarding the heat transfer performance of an evaporator with capillary wick are presented. The capillary wick structure is composed of sintered multilayer copper mesh. The multilayer copper mesh was sintered on the copper plate. With different combinations of mesh screens, the wick thickness of mesh 140 ranged from 0.6 to 1.0 mm, and those of meshes 60 and 140/60 were both 1.0 mm. The operating pressures used in this study were 0.86 × 105, 0.91 × 105, 0.96 × 105, 1.01 × 105, and 2.0 × 105 Pa. The experimental results indicate that the heat transfer performance was strongly dependent on the thickness of the sintered mesh structure and on the mesh size. The operating pressure also has a strong influence on the evaporation/boiling heat transfer performance of a mesh structure sintered using a single mesh size. However, it was also observed that the evaporation/boiling heat coefficient increased with an increase in the thickness of the capillary wick structure, which is less than 1.0 mm. The experimental results further illustrate that the composite sintered mesh structure was capable of properly enhancing the heat transfer performance, especially under high pressure. The maximum enhancement was 31.98%.

An Investigation of Evaporation Heat Transfer in Sintered Copper Wicks With Microgrooves

2006 ◽  
Author(s):  
Yuan Zhao ◽  
Chung-Lung Chen
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Heat Transfer Performance ◽  
Pore Radius ◽  
Distilled Water ◽  
Transfer Performance ◽  
Sintered Copper ◽  
Evaporation Heat ◽  
Evaporation Heat Transfer ◽  
Effective Pore Radius

This paper presents an experimental study on the parameters that determine the thermal performance of sintered copper wicks with longitudinal micro grooves for heat pipe applications. The grooves, which provide passages to vent vapor, have a width in a range from 150 μm to 500 μm. The copper powder used here has a nominal diameter of 50 μm, which produces an effective pore radius of approximately 13 μm. The main wicks composed of pores and grooves present characteristics of bi-dispersed wick structures. Unlike traditional bi-dispersed wick structures, the sintered grooved wick structures provide undisrupted longitudinal liquid delivery passages and thus improve the boiling limit. Performance of the wick structures with distilled water was examined and the effects of the heat flux and groove geometries on the evaporation/boiling heat transfer performance were studied.

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