An experimental study on the performance of closed loop pulsating heat pipe (CLPHP) with methanol as a working fluid

2016 ◽  
Author(s):  
Md. Lutfor Rahman ◽  
Farah Nazifa Nourin ◽  
Zaimaa Salsabil ◽  
Nusrat Yasmin ◽  
Mohammad Ali
Keyword(s):  
Experimental Study ◽  
Heat Pipe ◽  
Closed Loop ◽  
Working Fluid ◽  
Pulsating Heat Pipe

Experimental Study of Evaporator Surface Area Influence on a Closed Loop Pulsating Heat Pipe Performance

2012 ◽  
Author(s):  
Mohammad Hadi Tabatabaee ◽  
Mahshid Mohammadi ◽  
Mohammad Behshad Shafii
Keyword(s):  
Experimental Study ◽  
Heat Source ◽  
Heat Pipe ◽  
Flow Regime ◽  
Surface Area ◽  
Closed Loop ◽  
Heat Removal ◽  
Working Fluid ◽  
Pulsating Heat Pipe ◽  
Widespread Application

Pulsating Heat Pipes are an effective mean for heat removal with the potential for a widespread application in electronic packaging. An experimental study a Closed Loop Pulsating Heat Pipe (CLPHP) constructed of copper tubes formed into four meandering turns is presented. Once configured in a vertical orientation the lower portion of the CLPHP comes in contact with a heat source (called the evaporator) from which it will remove heat through the pulsating action of the two-phase mixture contained within the initially evacuated copper tubes eventually transfer the heat to a heat sink (known as the condenser). Heat fluxes can be measured using temperature data gathered from experiments. Thermocouples connected to the copper tubes at several locations provide this data. Experiments were conducted using deionized water as the working fluid. The surface area of the tubing which comes in contact with the heat source at the evaporator affects the heat removal rates. This effect was studied by varying the surface area in contact with the heat source while providing the same power input. Experiments were conducted using different filling ratios of working fluid (20–70%) for each case. The heat source (heating elements wound around the tubes) was supplied with different power inputs ranging from 10 to 40 W. Results indicate the surface area affects the pulsating action differently for each configuration because of its dependency on the flow regime. These results are presented for each flow regime. The results can be used to optimize the CLPHP according to the flow regime which it will be working in.

scholarly journals Experimental study of a closed loop flat plate pulsating heat pipe under a varying gravity force

2015 ◽  
Vol 96 ◽  
pp. 23-34 ◽  
Author(s):  
V. Ayel ◽  
L. Araneo ◽  
A. Scalambra ◽  
M. Mameli ◽  
C. Romestant ◽  
...  
Keyword(s):  
Experimental Study ◽  
Flat Plate ◽  
Heat Pipe ◽  
Closed Loop ◽  
Gravity Force ◽  
Pulsating Heat Pipe

Experimental study on a hydrogen closed-loop pulsating heat pipe with two turns

Cryogenics ◽  
2019 ◽  
Vol 97 ◽  
pp. 63-69 ◽  
Author(s):  
Xiao Sun ◽  
Sizhuo Li ◽  
Bo Jiao ◽  
Zhihua Gan ◽  
John Pfotenhauer
Keyword(s):  
Experimental Study ◽  
Heat Pipe ◽  
Closed Loop ◽  
Pulsating Heat Pipe

Experimental Study on a Hydrogen Closed Loop Pulsating Heat Pipe with Different Adiabatic Lengths

2018 ◽  
Vol 40 (3-4) ◽  
pp. 205-214 ◽  
Author(s):  
Zhihua Gan ◽  
Xiao Sun ◽  
Bo Jiao ◽  
Dongyang Han ◽  
Haoren Deng ◽  
...  
Keyword(s):  
Experimental Study ◽  
Heat Pipe ◽  
Closed Loop ◽  
Pulsating Heat Pipe

Modeling for Fluid Flow and Heat Transfer in Closed Loop Pulsating Heat Pipe

2020 ◽  
pp. 1-34
Author(s):  
Radhakanta Sarangi ◽  
Satya Prakash Kar ◽  
Abhilas Swain ◽  
Lalit Kumar Pothal
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Vapor Bubble ◽  
Closed Loop ◽  
Working Fluid ◽  
Vapour Bubble ◽  
Pulsating Heat Pipe ◽  
Time Step ◽  
Liquid Plug ◽  
Evaporation And Condensation

Abstract Numerical modelling of multi turn Closed Loop Pulsating Heat Pipe (CLPHP) is presented in this paper for ethanol as working fluid. Modelling is carried out for 1mm and 2mm ID PHP for different number of turns, different orientations and at constant wall temperature boundary conditions. Momentum and heat transfer variations with time are investigated numerically solving the one dimensional governing equations for vapor bubble and liquid plugs. Evaporation and condensation takes place by heat transfer through liquid film present around the vapour bubble. The code takes into account the realistic phenomena such as vapour bubble generation, liquid plug merging and super heating of vapor bubbles above its saturation temperature. During merging of liquid plugs, a time step adaptive scheme is implemented and this minimum time step was found to be 10−7 s. Nature of flow is investigated by momentum variation plot. Model results are compared with the experimental results from literature for nine different cases. Maximum variation in heat transfer for all these cases is found to be below ±34%. Keywords: Closed Loop Pulsating Heat Pipe, Liquid Plug, Plug momentum, Vapor Bubble, Heat Transfer, Thin Film Evaporation and Condensation

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