Thermal Transpiration Behavior of Hydrogen Isotopes in Cryogenic Pump System

2009 ◽  
Vol 56 (1) ◽  
pp. 179-183 ◽  
Author(s):  
Kenji Kotoh ◽  
Masashi Kawahara ◽  
Keisuke Kimura ◽  
Kazuhiko Kudo
Keyword(s):  
Hydrogen Isotopes ◽  
Pump System ◽  
Thermal Transpiration ◽  
Cryogenic Pump

Cavitation Performance of a Cryogenic Pump System

2018 ◽  
Vol 2018 (0) ◽  
pp. OS8-8
Author(s):  
Masato HIJIKURO ◽  
Teiichi TANAKA
Keyword(s):  
Pump System ◽  
Cavitation Performance ◽  
Cryogenic Pump

Experimental study on natural circulation precooling of cryogenic pump system with gas phase inlet reflux configuration

Cryogenics ◽  
2003 ◽  
Vol 43 (12) ◽  
pp. 693-698 ◽  
Author(s):  
G.B. Chen ◽  
Y.K. Zhong ◽  
X.L. Zheng ◽  
Q.F. Li ◽  
X.M. Xie ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gas Phase ◽  
Natural Circulation ◽  
Pump System ◽  
Cryogenic Pump

Power Generation From Thermal Transpiration Based Pumping Devices

2014 ◽  
Author(s):  
Pingying Zeng ◽  
Kang Wang ◽  
Ryan Falkenstein-Smith ◽  
Jeongmin Ahn ◽  
Paul D. Ronney
Keyword(s):  
Power Generation ◽  
Gas Turbines ◽  
Internal Combustion Engines ◽  
Gas Flow ◽  
Hydrocarbon Fuels ◽  
Generation System ◽  
Pump System ◽  
Membrane Pore ◽  
Thermal Transpiration ◽  
Power Generation System

This study examines the successful development of a combustion-driven thermal transpiration-based combustor and a self-sustaining gas pump system having no moving parts and using readily storable hydrocarbon fuel. A stacked configuration was then integrated into the combustor creating a self-sustaining power generation system. In recent years, power generation devices employing hydrocarbon fuels rather than electrochemical storage as energy feedstock have been studied extensively due to the much higher energy densities of hydrocarbon fuels than the best available batteries. While many devices have been proposed including internal combustion engines and gas turbines, they all require the use of air to obtain a higher energy density so that only one reactant (fuel) need be carried. Thermal transpiration was accomplished by meeting two essential conditions: (1) gas flow in the transitional or molecular regime using glass microfiber filters as transpiration membranes and (2) a temperature gradient through the membrane using catalytic combustion downstream of the membrane. A cubic combustor was designed to house the thermal transpiration membrane and develop into a self-sustaining gas pump system. Fuel/Air would feed through an inlet into a mixing chamber that would flow into the thermal guard containing the thermal transpiration membrane. The thermal guard was developed from a high thermal conductivity stainless steel made into a cubic formation by using a 3D printing process. This configuration allowed both fuel and air to be transpired through the membrane meaning it was not possible for any reactant flow to occur as a result of the fuel supply pressure and only the membrane could draw reactants into the device. In addition to pumping, a single-chamber solid-oxide fuel cell (SC-SOFC) was incorporated into combustion driven thermal transpiration pumps to convert chemical or thermal energy into electrical energy for a self-contained portable power generation system. Experiments showed that transpiration pumps with larger porosity and larger overall size exhibited better performance, though membrane pore size had little effect. These results were quantitatively consistent with theoretical predictions. By exploiting the temperature and fuel/oxygen concentrations within the transpiration pump, the SOFC achieved a maximum power density of 40 mW/cm2. Despite being far lower than necessary for a power source to be competitive with batteries, this preliminary study signifies an on-going positive efficiency that has potential for improvement through optimizing SOFC technology.

Performance test results of cryogenic pump system for Demonstration Poloidal Coil

1988 ◽  
Vol 24 (2) ◽  
pp. 1003-1006 ◽  
Author(s):  
E. Tada ◽  
T. Hiyama ◽  
K. Kawano ◽  
M. Hoshino ◽  
H. Yamamura ◽  
...  
Keyword(s):  
Performance Test ◽  
Test Results ◽  
Pump System ◽  
Cryogenic Pump

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

Some features of the dual-temperature method of separation of hydrogen isotopes

1963 ◽  
Vol 60 ◽  
pp. 115-123
Author(s):  
S. E. Vaisberg ◽  
Ya. M. Varshavsky
Keyword(s):  
Hydrogen Isotopes ◽  
Temperature Method

3 kW Class Displacer Type Stirling Engine for Heat Pump System

1987 ◽  
Author(s):  
T. Nomaguchi ◽  
T. Suganami ◽  
M. Fujiwara ◽  
M. Sakai ◽  
T. Koda ◽  
...  
Keyword(s):  
Heat Pump ◽  
Stirling Engine ◽  
Pump System ◽  
Heat Pump System
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