scholarly journals Heat Transport Capability of Axial Grooved Heat Pipes. Capillary pumping limit under micro- and normal-gravity condition with asymmetrical heating.

1998 ◽  
Vol 64 (618) ◽  
pp. 520-525 ◽  
Author(s):  
Tetsurou OGUSHI ◽  
Takehide NOMURA ◽  
Akira YAO ◽  
Hiromitsu MASUMOTO ◽  
Masaaki MURAKAMI
Keyword(s):  
Heat Transport ◽  
Normal Gravity ◽  
Heat Pipes ◽  
Gravity Condition ◽  
Heat Transport Capability ◽  
Normal Gravity Condition

Airplane and Drop Experiments on Crystallization of InxGa1−xSb Semiconductor under Different Gravity Conditions

2001 ◽  
Vol 692 ◽  
Author(s):  
Krishnan Balakrishnan ◽  
Yasuhiro Hayakawa ◽  
Hideki Komatsu ◽  
Noriaki Murakami ◽  
Tetsuo Nakamura ◽  
...  
Keyword(s):  
Crystal Growth ◽  
High Speed ◽  
Normal Gravity ◽  
Ccd Camera ◽  
Reduced Gravity ◽  
Gravity Condition ◽  
Crystallization Experiments ◽  
Melting And Crystallization ◽  
Normal Gravity Condition

AbstractMelting and crystallization experiments of InGaSb were done under the reduced gravity condition (10−2G) in an airplane and at the normal gravity condition (1G) in the laboratory. Crystallized InGaSb was found to contain many needle crystals in both the cases. Reduced gravity condition was found to be more conducive for crystal growth than the normal gravity condition. Formation of spherical projections on the surface of InGaSb during its crystallization was in-situ observed using a high speed CCD camera in the drop experiment. Spherical projections showed dependence of gravity during its growth. Indium compositions in the spherical projections were found to vary depending on the temperature.

Self-Cooling Cavity Burs for Surgical Drills

2007 ◽  
Vol 1 (4) ◽  
pp. 293-296 ◽  
Author(s):  
Calvin C. Silverstein
Keyword(s):  
Heat Pipe ◽  
Heat Transport ◽  
Brain Tissue ◽  
Conceptual Design ◽  
Heat Sink ◽  
Thermal Damage ◽  
Heat Pipes ◽  
Cutting Edge ◽  
Cooling Cavity ◽  
Heat Transport Capability

In a self-cooled drill, an especially designed bur is used to transport heat generated at the cutting edge into the handpiece, where it is dissipated into an air heat sink. The bur contains a sealed cavity partially filled with water, which transports heat via the principle of rotating heat pipe technology. The heat transport capability of burs fitted out as rotating heat pipes was established. A conceptual design for a representative bur was prepared, based on surgical drill sculpting criteria. It appears that a self-cooled surgical drill for sculpting can limit bone temperatures below levels for the initiation of thermal damage in bone, nerve, and brain tissue, without the need to employ an externally applied coolant.

Synthesis of In - Sb alloys by directional solidification in microgravity and normal gravity condition

1997 ◽  
pp. 695-700
Author(s):  
Hideki Minagawa ◽  
Yoshikazu Suzuki ◽  
Katsuyoshi Shimokawa ◽  
Yoshinobu Ueda ◽  
Jiro Nagao ◽  
...  
Keyword(s):  
Directional Solidification ◽  
Normal Gravity ◽  
Gravity Condition ◽  
Normal Gravity Condition

Performance Improvement in Pulsating Heat Pipes Using a Self-Rewetting Fluid

2009 ◽  
Author(s):  
K. Fumoto ◽  
M. Kawaji
Keyword(s):  
Surface Tension ◽  
Heat Pipe ◽  
Heat Transport ◽  
Heated Surface ◽  
Heat Pipes ◽  
Input Power ◽  
Water Mixture ◽  
Pulsating Heat Pipe ◽  
Maximum Heat ◽  
Heat Transport Capability

New experimental results have been obtained on the enhancement of heat transport by a pulsating heat pipe (PHP) using a self-rewetting fluid. Self-rewetting fluids have a property that the surface tension increases with temperature unlike other common liquids. The increasing surface tension at a higher temperature could cause the liquid to be drawn towards a heated surface if a dry spot appears, and improving boiling heat transfer. In the present experiments, 1-butanol was added to water at a concentration of less than 1 wt% to make the self-rewetting fluid. A pulsating heat pipe made from an extruded multi-port tube was partially filled with the butanol-water mixture and tested for its heat transport capability at different input power levels. The experiments showed that the maximum heat transport capability was enhanced by a factor of four when the maximum heater temperature was limited to 120 °C. Thus, the use of a self-rewetting fluid in a PHP has been shown to be highly effective in improving the heat transport capability of pulsating heat pipes.

Experimental Investigation of Micro/Nano Heat Pipe Wick Structures

2008 ◽  
Author(s):  
H. Peter J. de Bock ◽  
Kripa Varanasi ◽  
Pramod Chamarthy ◽  
Tao Deng ◽  
Ambarish Kulkarni ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Heat Transport ◽  
High Performance ◽  
Heat Pipes ◽  
High Heat ◽  
Two Phase ◽  
Wick Structure ◽  
Two Phase Heat Transfer ◽  
Heat Transport Capability ◽  
Transfer Device

The performance of electronic devices is limited by the capability to remove heat from these devices. A heat pipe is a device to facilitate heat transport that has seen increased usage to address this challenge. A heat pipe is a two-phase heat transfer device capable of transporting heat with minimal temperature gradient. An important component of a heat pipe is the wick structure, which transports the condensate from the condenser to the evaporator. The requirements for high heat transport capability and high resilience to external accelerations leads to the necessity of a design trade off in the wick geometry. This makes the wick performance a critical parameter in the design of heat pipes. The present study investigates experimental methods of testing capillary performance of wick structures ranging from micro- to nano-scales. These techniques will facilitate a pathway to the development of nano-engineered wick structures for high performance heat pipes.

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