scholarly journals LOW-ORDER MODEL OF THE DYNAMICS AND START-UP OF A PULSATING HEAT PIPE

2021 ◽  
Vol 17 ◽  
Author(s):  
Felix Schily ◽  
Wolfgang Polifke
Keyword(s):  
Heat Pipe ◽  
Pulsating Heat Pipe ◽  
Order Model ◽  
Start Up ◽  
Low Order

Enhancement of start-up and thermal performance in pulsating heat pipe with GO/water nanofluid

2021 ◽  
Vol 384 ◽  
pp. 414-422
Author(s):  
Yi Zhou ◽  
Honghai Yang ◽  
Liwei Liu ◽  
Miao Zhang ◽  
Yaofeng Wang ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Thermal Performance ◽  
Pulsating Heat Pipe ◽  
Start Up

Reprint of: Effect of tube heat conduction on the pulsating heat pipe start-up

2017 ◽  
Vol 126 ◽  
pp. 1077-1082 ◽  
Author(s):  
Iaroslav Nekrashevych ◽  
Vadim S. Nikolayev
Keyword(s):  
Heat Conduction ◽  
Heat Pipe ◽  
Pulsating Heat Pipe ◽  
Start Up

scholarly journals Start-Up and Operation of a 3D Hybrid Pulsating Heat Pipe on Board a Sounding Rocket

2019 ◽  
Vol 31 (3) ◽  
pp. 249-259 ◽  
Author(s):  
Mauro Mameli ◽  
Stefano Piacquadio ◽  
Alessandro Simone Viglione ◽  
Andrea Catarsi ◽  
Carlo Bartoli ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Sounding Rocket ◽  
Pulsating Heat Pipe ◽  
Start Up

scholarly journals Experiment Study on Improved Closed Loop Pulsating Heat Pipe with Silver/Water Nanofluid

2013 ◽  
Vol 732-733 ◽  
pp. 462-466
Author(s):  
Wei Xiu Shi ◽  
Wei Yi Li ◽  
Li Sheng Pan
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Heat Pipe ◽  
Closed Loop ◽  
Filling Ratio ◽  
Pulsating Heat Pipe ◽  
Start Up ◽  
High Heating ◽  
Operation Stability ◽  
Heat Transfer Limit

Start up and heat transfer performances of improved closed loop pulsating heat pipe (ICLPHP) charged with water and silver/water nanofluid, respectively, were investigated experimentally with angles of 90° and 60°. Both the average evaporator wall temperature and the overall thermal resistance of the ICLPHP with different working fluids and at the volume filling ratio of 35% were tested and compared. Experimental results showed that nanofluid caused different thermal performances of ICLPHP. Within the experiment range, silver/water nanofluid can improve operation stability and heat transfer limit and reduce starting power compared with water. With high heating power, thermal resistance of nanofluid was lower than that of water. With inclination of 60°, ICLPHP with nanofluid operated better and reduced sensitivity of inclination.

scholarly journals Effect of tube heat conduction on the pulsating heat pipe start-up

2017 ◽  
Vol 117 ◽  
pp. 24-29 ◽  
Author(s):  
Iaroslav Nekrashevych ◽  
Vadim S. Nikolayev
Keyword(s):  
Heat Conduction ◽  
Heat Pipe ◽  
Pulsating Heat Pipe ◽  
Start Up

scholarly journals Experimental study on novel pulsating heat pipe radiator for horizontal CPU cooling under different wind speeds

2021 ◽  
pp. 59-59
Author(s):  
Fumin Shang ◽  
Qingjing Yang ◽  
Shilong Fan ◽  
Chaoyue Liu ◽  
Jianhong Liu
Keyword(s):  
Temperature Distribution ◽  
Wind Speed ◽  
Heat Pipe ◽  
Cooling System ◽  
Heating Process ◽  
Temperature Uniformity ◽  
Pulsating Heat Pipe ◽  
Desktop Computer ◽  
Wind Speeds ◽  
Start Up

Herein, a horizontal CPU cooler with a pulsating heat pipe (PHP) for cooling desktop computer was developed. In the experiment, an electric heating block was used to heat a copper plate to simulate the heating process of CPUs. The cooling system consists of a cooling fan and a pulsating heat pipe cooler. The influence of cooling wind speed and heat load on heat transfer performance, start-up performance, and temperature uniformity of the PHP cooler was analyzed by controlling variable method. The wind speed was set to be 0 m/s, 0.1 m/s, 0.3 m/s, 0.5 m/s and 0.7 m/s respectively. The contour plots were used to analyze the uniformity of temperature distribution due to cooler. The results show that the start-up of the PHP led to a decrease in temperature of CPUs. As the cooling wind speed increased, the start-up time of the php dropped, the start-up temperature dropped, and its stability was also improved. The operation at different cooling wind speeds also changed the start-up mode of the PHP. The start-up performance was best at cooling wind speed of 0.3 m/s. The contour plot for temperature showed that the temperature distribution of the PHP cooler became more uniform with increased cooling wind speeds. There was excellent temperature uniformity at the cooling wind speeds of 0.3 m/s and 0.7 m/s. When the cooling wind speed was 0.7 m/s, the minimum average thermal resistance was 0.51 K/W.

Visualization Experiment on the Start-up Performance of the Close Loop Pulsating Heat Pipe

2012 ◽  
Vol 550-553 ◽  
pp. 3150-3154 ◽  
Author(s):  
Xun Wang ◽  
Cheng Si Yang ◽  
Xin Xin Mao ◽  
Tong Han
Keyword(s):  
Heat Pipe ◽  
Heat Load ◽  
Early Stage ◽  
Flow Direction ◽  
High Heat ◽  
Working Fluid ◽  
Pulsating Heat Pipe ◽  
Optical Visualization ◽  
Start Up ◽  
Visualization Experiment

Through the visualization experiment, the behavior evolution of the vapor and liquid slugs in the pulsating heat pipe (PHP) was investigated in the start-up process. Optical visualization results indicate that the flow pattern mainly is slug flow in the start-up process. In the early stage of the start-up process, the distribution of vapor and liquid slugs was random at the beginning, and then gradually develops to the other form which can easily pulsate in the PHP. In the later stage, pulsation stagnation in short time and reversing of the flow direction of the working fluid could be found at low heat load, when there exists the circulation flow in the PHP. Circulation was formed along a certain direction at high heat load. In addition, the PHP can be started up with less time and lower minimum start load by using working fluid which has lower latent heat.

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