Heat transfer capacity of channel heat pipes with triangular capillary structure

1985 ◽  
Vol 49 (4) ◽  
pp. 1181-1185 ◽  
Author(s):  
V. D. Portnov ◽  
T. M. Grigor'eva
Keyword(s):  
Heat Transfer ◽  
Heat Pipes ◽  
Capillary Structure ◽  
Heat Transfer Capacity

scholarly journals Research of the process of obtaining capillary-porous materials from metal powders for heat pipes

Doklady BGUIR ◽  
2021 ◽  
Vol 19 (4) ◽  
pp. 5-12
Author(s):  
L. P. Pilinevich ◽  
M. V. Tumilovich ◽  
A. G. Kravtsov ◽  
D. M. Rumiantsav ◽  
K. V. Hryb
Keyword(s):  
Heat Transfer ◽  
Porous Materials ◽  
Heat Pipe ◽  
Heat Pipes ◽  
Pore Distribution ◽  
Metal Powders ◽  
Capillary Structure ◽  
Efficient Operation ◽  
Pore Sizes ◽  
Heat Transfer Capacity

Heat pipes are designed to effective removing heat from heating elements and reducing the temperature of various devices. Heat pipes with capillary porous structures are designed to operate under conditions of unfavorable gravity forces. Their main advantages are their high heat transfer capacity, as well as the ability to retain the coolant in a capillary-porous structure under dynamic power loads. The purpose of this work is to study the process of obtaining capillary-porous materials from metal powders for heat pipes with increased efficiency of using the vibration molding method. The article substantiates the relevance of creating heat pipes from metal powders. The information about the influence of the contact angle, surface tension and capillary pressure on the heat transfer capacity of a heat pipe is provided. It is shown that for the efficient operation of the heat pipe it is necessary to create such a capillary structure of the porous material, which could simultaneously provide a high speed of movement of the coolant and its rise to a given height. The above requirements can be satisfied by creating a capillary structure using powder metallurgy methods by optimizing the distribution of pore sizes. In this case, the most promising method seems to be the method of molding when applying a vibration to a mold with a powder. It is possible to obtain the required pore distribution in this way by choosing the correct particle size, shape and vibration parameters. This makes it possible to ensure the packing of particles in size, which affects their packing density, pore size, tortuosity and length of pore channels. The distribution of the maximum pore sizes over the thickness of the samples obtained from powders of various granulometric composition with the use of vibration has been investigated. As a result, a process was developed for obtaining capillary structures by the method of vibration molding of metal powders, depending on the size of the powder particles, the amplitude and frequency of vibration. It is shown that this method can provide a given pore distribution of the capillary structure for heat pipes, which makes it possible to increase their heat transfer capacity.

Theoretical Investigation of Heat Pipes Operating at Low Vapor Pressures

1968 ◽  
Vol 90 (4) ◽  
pp. 547-552 ◽  
Author(s):  
E. K. Levy
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Dimensional Analysis ◽  
Theoretical Investigation ◽  
Heat Pipes ◽  
Vapor Pressures ◽  
One Dimensional ◽  
Evaporator Section ◽  
Heat Transfer Capacity ◽  
Theoretical Results

A one-dimensional analysis of a compressible vapor flowing within the evaporator section of a heat pipe is presented. Comparisons between the theoretical results and existing heat pipe data show that the presence of gasdynamic choking can limit the heat transfer capacity of a heat pipe operating at sufficiently low vapor pressures.

Investigation of Heat Transfer Enhancement Effect on Normal and Nano Coated Wick Structure Heat Pipes-A Comparative Assessment

2020 ◽  
Vol 51 ◽  
pp. 191-198
Author(s):  
N. Manikanda Prabu ◽  
S. Nallusamy ◽  
G. Sureshkannan
Keyword(s):  
Heat Transfer ◽  
Electronic Devices ◽  
Research Work ◽  
Heat Pipes ◽  
Enhancement Effect ◽  
Heat Transfer Capacity ◽  
Wick Structure ◽  
Improve Heat Transfer ◽  
Super Conducting ◽  
The Stability

Removal of heat generation is an important characteristic needs to be considered in electromechanical and electronic devices which improve the stability and feasibility of system. Despite numerous cooling methods, heat pipes are recent updating in research line. Heat pipes are one of the super conducting medium of heat energy and it is being used as an equipment to absorb more heat through phase change process of cooling medium circulated in it. It ensures the direct enhancement in heat transfer capacity and characteristics. Nowadays, improvement of the thermal performance in heat pipes getting up with various technologies, especially combination of heat pipe and Nano fluids. It has been experimentally practiced and various results are observed by previous researches that wick structure also a part of reason in improvement. The aim of this research work is to analyze the influence of wick material to improve heat transfer characteristics in heat pipes. In addition, combination of nano coated wick material with heat pipes is comparatively analyzed. From the final observed results it was found that, the best combination of wick material is supporting the better cooling requirements in electronic devices.

Heat transfer capacity of heat pipes: An application in coalfield wildfire in China

2018 ◽  
Vol 54 (6) ◽  
pp. 1755-1766 ◽  
Author(s):  
Bei Li ◽  
Jun Deng ◽  
Yang Xiao ◽  
Xiaowei Zhai ◽  
Chi-Min Shu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Pipes ◽  
Heat Transfer Capacity

An Experimental Investigation on Micro Heat Pipe with a Trapezium-Grooved Wick Structure

2010 ◽  
Vol 29-32 ◽  
pp. 1695-1700
Author(s):  
Shi Gang Wang ◽  
Xi Bing Li ◽  
Bai Rui Tao ◽  
Hong Xia Zhang
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Heat Pipe ◽  
Optimum Design ◽  
Heat Pipes ◽  
Micro Heat Pipe ◽  
Capillary Limit ◽  
Heat Transfer Capacity ◽  
Wick Structure ◽  
Micro Heat Pipes

Through combination of experimental investigation with theoretical optimum design, this paper determined the crucial factors in affecting the heat transfer capacity in micro heat pipes with a trapezium-grooved wick structure are capillary limit and entrainment limit, and verified the validity of the heat transfer models thus built.

Effect of Increasing Wick Evaporation Area on Heat Transfer Performance for Loop Heat Pipes

2013 ◽  
Vol 711 ◽  
pp. 223-228 ◽  
Author(s):  
Shen Chun Wu ◽  
Jhih Huang Gao ◽  
Zih Yan Huang ◽  
Dawn Wang ◽  
Cho Jeng Huang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Heat Pipe ◽  
Surface Area ◽  
Heat Transfer Performance ◽  
Heat Pipes ◽  
Loop Heat Pipe ◽  
Transfer Performance ◽  
Loop Heat Pipes ◽  
Heat Transfer Capacity

This study investigates the effects of increasing the evaporating area of wick in a loop heat pipe (LHP). This work attempts to improve the performance of the loop heat pipe by increasing the number of grooves and thereby the surface area of the wick. The number of grooves is increased from eight to twelve. Experimental results show that increasing the number of grooves not only increases the surface area of the wick but also enhances LHP performance. When the evaporating surface area increases by 50%, which corresponds to increasing the number of grooves from eight to twelve, the heat transfer capacity increases from 310W to 470W and the thermal resistance is reduced from 0.21°C/W to 0.17°C/W. According to preliminary measurements, increasing the number of grooves in the loop heat pipe is highly promising for improving the heat transfer performance.

Experimental Investigations of Radially Rotating Miniature High-Temperature Heat Pipes

2000 ◽  
Vol 123 (1) ◽  
pp. 113-119 ◽  
Author(s):  
Jian Ling ◽  
Yiding Cao ◽  
Alex P. Lopez
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heat Pipe ◽  
High Speed ◽  
Thermal Conductance ◽  
Heat Pipes ◽  
Experimental Investigations ◽  
Temperature Heat ◽  
Heat Transfer Capacity ◽  
High Temperature Heat Pipe

A radially rotating miniature high-temperature heat pipe employs centrifugal force to return the condensate in the condenser section to the evaporator section. The heat pipe has a simple structure, very high effective thermal conductance and heat transfer capacity, and can work in hostile high-temperature environments. In this research, a high-speed rotating test apparatus and data acquisition system for radially rotating miniature high-temperature heat pipes are established. Extensive experimental tests on two heat pipes with different dimensions are performed, and various effects of influential parameters on the performance characteristics of the heat pipes are investigated. The ranges of the important parameters covered in the current experiments are: 470⩽ω2Za¯/g⩽1881; 47 W⩽Q⩽325W; di=1.5 and 2 mm; and 1.05×10−3m3/s⩽W⩽13.4×10−3m3/s. The experimental data prove that the radially rotating miniature high-temperature heat pipe has a high effective thermal conductance, which is 60–100 times higher than the thermal conductivity of copper, and a large heat transfer capacity that is more than 300 W. Therefore, the heat pipe appears to be feasible for cooling high-temperature gas turbine components.

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