Open-loop chemical heat pipes

Energy ◽  
1979 ◽  
Vol 4 (6) ◽  
pp. 1187-1188
Author(s):  
L. Icerman
Keyword(s):  
Heat Pipes ◽  
Open Loop ◽  
Chemical Heat

Effects of Surface Coating of Nanoparticles on Thermal Performance of Open Loop Pulsating Heat Pipes

2012 ◽  
Author(s):  
Mehdi Taslimifar ◽  
Maziar Mohammadi ◽  
Ali Adibnia ◽  
Hossein Afshin ◽  
Mohammad Hassan Saidi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Heat Pipe ◽  
Thermal Performance ◽  
Surface Coating ◽  
Heat Pipes ◽  
Open Loop ◽  
Working Fluid ◽  
Pulsating Heat Pipe ◽  
Performance Of Heat Transfer

Homogenous dispersing of nanoparticles in a base fluid is an excellent way to increase the thermal performance of heat transfer devices especially Heat Pipes (HPs). As a wickless, cheap and efficient heat pipe, Pulsating Heat Pipes (PHPs) are important candidates for thermal application considerations. In the present research an Open Loop Pulsating Heat Pipe (OLPHP) is fabricated and tested experimentally. The effects of working fluid namely, water, Silica Coated ferrofluid (SC ferrofluid), and ferrofluid without surface coating of nanoparticles (ferrofluid), charging ratio, heat input, and application of magnetic field on the overall thermal performance of the OLPHPs are investigated. Experimental results show that ferrofluid has better heat transport capability relative to SC ferrofluid. Furthermore, application of magnetic field improves the heat transfer performance of OLPHPs charged with both ferrofluids.

Open-Loop Pulsating Heat Pipes Charged With Magnetic Nanofluids: Powerful Candidates for Future Electronic Coolers

2014 ◽  
Vol 18 (1) ◽  
pp. 18-38 ◽  
Author(s):  
Maziar Mohammadi ◽  
Mehdi Taslimifar ◽  
Shahab Haghayegh ◽  
Siamak Kazemzadeh Hannani ◽  
Mohammad Behshad Shafii ◽  
...  
Keyword(s):  
Heat Pipes ◽  
Open Loop ◽  
Magnetic Nanofluids

Thermal and Visual Observation of Water and Acetone Oscillating Heat Pipes

2008 ◽  
Author(s):  
C. Wilson ◽  
B. Borgmeyer ◽  
R. A. Winholtz ◽  
H. B. Ma ◽  
D. Jacobson ◽  
...  
Keyword(s):  
Neutron Radiography ◽  
Fluid Velocity ◽  
Fluid Motion ◽  
Heat Pipes ◽  
Visual Observation ◽  
Open Loop ◽  
Condenser Temperature ◽  
Rich Liquid ◽  
Two Sides ◽  
Better Than

Identical oscillating heat pipes (OHP) charged separately with water and acetone were observed thermally and visually at varying condenser temperatures and heat inputs. Neutron radiography allowed visualization of hydrogen rich liquid water and acetone within the copper OHP. Four identical 6 turn OHPs were constructed; two as open loop and two close loop. One set of open and close loop OHP was charged with acetone and an open and close loop OHP were charged with water at fill ratios of 50%. The OHPs were also instrumented with 24 thermocouples, heated with a strip heater and cooled with heavy water. Both thermal and visual data were collected simultaneously. The experiments show that at low heat flux and condenser temperature, the acetone OHP performed better than the water OHP. Using neutron radiography, the acetone OHP was seen to have higher fluid velocity than the water OHP. The fluid flow pattern was also more consistent throughout the entire close loop acetone OHP including full circulation of the fluid. The close loop water OHP never fully circulates through the turn connecting the two sides. Lastly, neutron radiography shows that the open loop OHPs not only have less fluid motion at the side turns, the interior turns also have reduced fluid motion compared to the close loop OHPs.

Ferrofluidic Open Loop Pulsating Heat Pipes: Efficient Candidates for Thermal Management Of Electronics

2014 ◽  
Vol 27 (3) ◽  
pp. 296-312 ◽  
Author(s):  
Maziar Mohammadi ◽  
Mehdi Taslimifar ◽  
Mohammad Hassan Saidi ◽  
Mohammad Behshad Shafii ◽  
Hossein Afshin ◽  
...  
Keyword(s):  
Thermal Management ◽  
Heat Pipes ◽  
Open Loop ◽  
Thermal Management Of Electronics

Oil-shale gasification by concentrated sunlight: An open-loop solar chemical heat pipe

Energy ◽  
1992 ◽  
Vol 17 (12) ◽  
pp. 1189-1197 ◽  
Author(s):  
Gil Ingel ◽  
Moshe Levy ◽  
J.M. Gordon
Keyword(s):  
Heat Pipe ◽  
Oil Shale ◽  
Open Loop ◽  
Chemical Heat

Open Loop Heat Pipes for High-Efficiency Desalination Plant

2021 ◽  
pp. 117027
Author(s):  
Xiantao Zhang ◽  
Hongsheng Wang ◽  
Haoqing Jiang ◽  
Changzheng Li ◽  
Xuejiao Hu
Keyword(s):  
High Efficiency ◽  
Heat Pipes ◽  
Open Loop ◽  
Loop Heat Pipes ◽  
Desalination Plant

Overall thermal performance of ferrofluidic open loop pulsating heat pipes: An experimental approach

2013 ◽  
Vol 65 ◽  
pp. 234-241 ◽  
Author(s):  
Mehdi Taslimifar ◽  
Maziar Mohammadi ◽  
Hossein Afshin ◽  
Mohammad Hassan Saidi ◽  
Mohammad Behshad Shafii
Keyword(s):  
Thermal Performance ◽  
Experimental Approach ◽  
Heat Pipes ◽  
Open Loop

Experimental Study of the Startup Performance of Ferrofluidic Open Loop Pulsating Heat Pipes

2012 ◽  
Author(s):  
Maziar Mohammadi ◽  
Mehdi Taslimifar ◽  
Siamak Kazemzadeh Hannani ◽  
Mohammad Hassan Saidi ◽  
Hossein Afshin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Pipes ◽  
Open Loop ◽  
Electronic Cooling ◽  
Working Fluid ◽  
Distilled Water ◽  
The Novel ◽  
High Concentration ◽  
Cooling Devices ◽  
Startup Performance

Pulsating Heat Pipes (PHPs) are new and promising heat transfer devices. To implement the novel idea to vary the startup performance of a PHP using ferrofluid with and without the application of magnetic field, an experimental investigation is conducted. The effects of several important parameters including working fluid, charging ratio, heat input, ferrofluid concentration, internal pressure, and application of magnetic field on the startup performance of Open Loop Pulsating Heat Pipes (Open Loop PHPs) have been considered and described in detail. Obtained results show that using ferrofluid instead of distilled water can improve the startup performance of PHPs in certain conditions. Furthermore, application of magnetic field on the water based ferrofluid helps PHPs to startup at lower temperatures. High concentration of ferrofluids (5 % w/v) degrades startup performance of PHPs. This study helps to design electronic cooling devices to be more efficient.

scholarly journals Thermal and Visual Observation of Water and Acetone Oscillating Heat Pipes

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
C. Wilson ◽  
B. Borgmeyer ◽  
R. A. Winholtz ◽  
H. B. Ma ◽  
D. Jacobson ◽  
...  
Keyword(s):  
Closed Loop ◽  
Heat Pipes ◽  
Visual Observation ◽  
Open Loop ◽  
Vapor Bubbles ◽  
Copper Tubing ◽  
Inner Diameter ◽  
Two Sides ◽  
Heat Spreading ◽  
Better Than

A visual and thermal experimental investigation of four oscillating heat pipes (OHPs) was conducted to observe fluid flow of liquid plugs and vapor bubbles in the OHP and its effect on the temperature distribution and heat transfer performance in an OHP. These four OHPs consist of an open loop water OHP, an open loop acetone OHP, a closed loop water OHP, and a closed loop acetone OHP. These copper OHPs were constructed identically with all six turns in the same plane. They were constructed out of 1.65 mm inner diameter copper tubing and copper heat spreading plates in the evaporator and condenser regions. The heat pipes were charged at a filling ratio of about 50%. The results show that the acetone OHP at low power performs better than the water OHP, while at high power the water OHP exceeds the acetone OHP. The experimental results show that both the acetone and water closed loop OHPs had reduced movement in the connecting turn between the two sides. However, in the water closed loop OHP, this prevented circulation altogether. Comparing the water closed loop OHP to the water open loop OHP, their flow patterns were similar. Therefore, improving the flow in this turn should increase the closed loop OHP’s performance.

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