Experimental Investigation of a Capillary Pumped Loop Towards Its Integration on a Scientific Microsatellite

2002 ◽  
Author(s):  
R. R. Riehl ◽  
H. V. R. Camargo ◽  
L. Heinen ◽  
E. Bazzo
Keyword(s):  
Molecular Weight ◽  
Experimental Investigation ◽  
Heat Load ◽  
Experimental Tests ◽  
Working Fluid ◽  
Capillary Pumped Loop ◽  
Load Range ◽  
Ultra High Molecular Weight ◽  
Reduced Scale ◽  
Fast Responses

This paper presents the experimental investigation of a capillary pumped loop (CPL) to be integrated on a scientific microsatellite. Tests in laboratory have been focused on the thermal behavior of a CPL on a reduced scale, using UHMW (Ultra High Molecular Weight) polyethylene as porous structure and anhydrous ammonia as working fluid. The experimental tests have shown that the proposed CPL presents reliable startups when operating on a heat load range between 20 and 50 W, also presenting very short transients when operating on different heat load profiles. Very fast responses of the CPL have been verified for sudden changes on the heat load applied to the capillary evaporator with reduced superheat. The proposed CPL will be part of a payload to be integrated on a Scientific Microsatellite scheduled to be launch in early 2004.

Polymer Composite Materials Based on Ultra High Molecular Weight Polyethylene Matrix Filled by Alumina Powders

2014 ◽  
Vol 1040 ◽  
pp. 124-129 ◽  
Author(s):  
O.V. Kovalevskaia ◽  
Y.I. Gordeev ◽  
Arthur K. Abkaryan
Keyword(s):  
Molecular Weight ◽  
Experimental Investigation ◽  
Particle Size ◽  
Composite Materials ◽  
High Molecular Weight ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Polyethylene Matrix ◽  
Microstructure And Properties ◽  
Ultra High Molecular Weight

The paper presents the results of experimental investigation of formation microstructure and properties of ultra high molecular weight polyethylene (UHMW-PE), modified by ceramics А12О3 particles by different particle size and method of obtaining.

Heat Transport Characteristics of a Pulsating Heat Pipe

2007 ◽  
Author(s):  
Takao Nagasaki ◽  
Toshiyuki Hokazono ◽  
Yutaka Ito
Keyword(s):  
Heat Pipe ◽  
Heat Transport ◽  
Heat Load ◽  
Working Fluid ◽  
Pulsating Heat Pipe ◽  
Load Range ◽  
Large Heat ◽  
Inner Diameter ◽  
Bottom Heat ◽  
Better Than

Heat transport characteristics of a closed loop pulsating heat pipe (PHP) have been investigated experimentally. The heat pipe consists of 12 turn copper pipes with 2mm inner diameter. The lengths of heating, adiabatic and cooling sections are 53mm, 100mm and 51mm, respectively. The heat load was varied up to nearly 1000W for water and R141b as the working fluid. Three kinds of orientation, bottom heat vertical, horizontal, and top heat vertical, were tested. Detailed measurements of wall temperature fluctuations for water revealed several characteristic operating behaviors, such as intermittent oscillation and thermosyphon-like behavior. The performance of PHP with R141b is better than that with water in small heat load range due to its independence of orientation, conversely, PHP with water was more efficient than R141b in large heat load range. In order to improve the performance of PHP with R141b, diamond particles were added, resulting in better performance than water in the whole range of heat load.

Dynamic Characteristics of the Capillary Pumped Loop for Cooling the Tower-Type Computer

2007 ◽  
Author(s):  
Atsushi Tsujimori ◽  
Masashi Kato ◽  
Maiko Uchida
Keyword(s):  
Heat Flux ◽  
Heat Transport ◽  
Dynamic Characteristics ◽  
Heat Load ◽  
Cooling Water ◽  
Transport Rate ◽  
Working Fluid ◽  
High Heat Flux ◽  
Capillary Pumped Loop ◽  
Heat Loads

Capillary pumped loop has been widely investigated for space thermal control devices. This cooling device with high reliability and thermal controllability is also considered to be suited to cool electronic devices like personal computers. Because the capillary pumped loop is good at absorbing heat from high heat flux region like micro-processors, transporting it and releasing it from the large surface for packaging. In this research, the experimental equipment of the capillary pumped loop was manufactured. The experimental apparatus consists of the evaporator, the condenser, the liquid line, the vapor line and the reservoir. In the experiments heat load is applied to the evaporator by a resistance heater. And heat is released from the condenser to the cooling water which is set to be a constant temperature by the refrigerator. The length and the diameter of the evaporator are 150mm and 27mm respectively and the capillary wick with equivalent diameter of 5μm is embedded in the evaporator. These specifications were designed to give 2500mm heat transport distance and to adapt the natural convection heat transfer to the ambient without a cooling fan. As is proposed in the recent study, the inside of the capillary wick was used as the reservoir to simplify the loop. In our previous study, the heat transport characteristics in steady states were investigated when the heat flux, the cooling water temperature and the evaporator height above the condenser changed, and then the effects of enclosed rate of the working fluid in the reservoir and the inclination angles of the evaporator on heat transport rate were investigated. The computer code was also developed to simulate the heat transport characteristics and evaluate the maximum heat transport rate of the tested capillary pump. In the next step, we focus on the dynamic characteristics. The heat loads of the micro-processors in the computers usually change according to the working conditions of the application software and vary hourly. Thus the active thermal regulation accompanied with the change of heat loads is the important factor for cooling devices in the computers. So in this study the heat transport characteristics in the dynamic conditions of the capillary pumped loop were investigated. In the experiment, the start-up and shut-down mode at a given heat load were tested at first. Then heat load were changed in incremental or decremental steps from 30 to 70W. All results show the good thermal controllability.

EFFECT OF WORKING FLUID ON 3-PORT CPL PERFORMANCE: AN EXPERIMENTAL INVESTIGATION

2014 ◽  
Vol 5 (1-4) ◽  
pp. 491-497
Author(s):  
Abhijit A. Adoni ◽  
Amrit Ambirajan ◽  
Jasvanth V. S. ◽  
D. Kumar ◽  
Pradip Dutta
Keyword(s):  
Experimental Investigation ◽  
Working Fluid
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