scholarly journals Liquid Nitrogen Subcooler for Calorimeters LN2 Supply: Pressure Vessel Calculations

2004 ◽  
Author(s):  
Michael Sarychev
Keyword(s):  
Liquid Nitrogen ◽  
Pressure Vessel ◽  
Supply Pressure

Shock Loading on the Liquid Nitrogen Pressure Vessel

2004 ◽  
Author(s):  
Toshiaki Watanabe ◽  
Toru Hamada ◽  
Shigeru Itoh
Keyword(s):  
Liquid Nitrogen ◽  
Pressure Vessel ◽  
Shock Loading ◽  
Nitrogen Pressure

Research on head cooling of high-speed aircraft by liquid nitrogen

2020 ◽  
Vol 125 (1284) ◽  
pp. 389-409
Author(s):  
H.X. Xiong ◽  
S.H. Yi ◽  
H.L. Ding ◽  
L. Jin ◽  
J.J. Huo
Keyword(s):  
Heat Exchange ◽  
Liquid Nitrogen ◽  
High Speed ◽  
Cooling System ◽  
Nitrogen Supply ◽  
Cooling Efficiency ◽  
Experimental Conditions ◽  
Supply Pressure ◽  
Head Cooling ◽  
Exchange Channel

AbstractIn the development process of high-speed aircraft, the head of the aircraft is subject to high temperatures and high speed flows, supporting the maximum heat flow and thus requiring a reliable cooling system. A new type of head cooling system is proposed herein. An internal flow channel model of the heat transfer in a ball head made from high-temperature alloy steel is constructed, then an experimental platform is built to carry out relevant experiments on the performance of this cooling system. Firstly, the influence of different experimental conditions on the cooling efficiency of the ball head is studied. For given liquid-nitrogen supply pressure, a higher heating heat flux density on the outer surface of the ball head corresponds to higher cooling efficiency. Then, the vaporisation effect under different experimental conditions is evaluated using temperature sensors at the inlet and outlet of the ball head heat exchange channel in combination with images of the visualised glass tube. It is found that liquid nitrogen can vaporise completely when flowing through the heat exchange channel. The characteristics of the heating effect and liquid nitrogen injection for the ball head were evaluated using an infrared camera. Finally, under different experimental conditions of liquid-nitrogen supply pressure, it is found that liquid nitrogen can vaporise completely in each case, and the total temperature of the vaporised nitrogen is about 300K. It can thus be collected as a secondary gas source.

Flashing Phenomena of Liquid Nitrogen in a Pressure Vessel Under Rapid Depressurizations

2015 ◽  
Author(s):  
Toshiaki Watanabe ◽  
Hironori Maehara ◽  
Makoto Nakamura ◽  
Hiromitsu Ohta ◽  
Shigeru Itoh
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Liquid Nitrogen ◽  
Pressure Vessel ◽  
The Other ◽  
Stream Of Consciousness ◽  
Cryogenic Fluids ◽  
Environmental Agreement ◽  
Device Technology ◽  
Effect Of Surface

In recent years in Japan, the demand of cryogenic fluids like a LH2, LNG is increasing because of the advance of fuel cell device technology, hydrogen of engine, and stream of consciousness for environmental agreement. The purpose of this study is to clarify some fundamental features of the flashing of cryogenic fluids. Experiments on flashing of liquid nitrogen were conducted to clarify the effect of surface roughness of a vessel. Two types of pressure vessel were used. One is a vessel made of stainless steel, the other is a vessel made of glass. In the case of glass vessel, many types of boiling have been observed. The degree of superheat at the start of boiling was found to depend strongly on the rate of depressurization.

Electron Probe Microanalysis of Frozen Hydrated Kidneys, Isolated Cells, and Cultured Cells

1982 ◽  
Vol 40 ◽  
pp. 402-403 ◽  
Author(s):  
Claude Lechene
Keyword(s):  
Liquid Nitrogen ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Cultured Cells ◽  
Liquid Nitrogen Temperature ◽  
Elemental Content ◽  
Isolated Cells ◽  
Renal Tubular Cells ◽  
Diamond Saw ◽  
Saw Blade

Electron probe microanalysis of frozen hydrated kidneysThe goal of the method is to measure on the same preparation the chemical elemental content of the renal luminal tubular fluid and of the surrounding renal tubular cells. The following method has been developed. Rat kidneys are quenched in solid nitrogen. They are trimmed under liquid nitrogen and mounted in a copper holder using a conductive medium. Under liquid nitrogen, a flat surface is exposed by sawing with a diamond saw blade at constant speed and constant pressure using a custom-built cryosaw. Transfer into the electron probe column (Cameca, MBX) is made using a simple transfer device maintaining the sample under liquid nitrogen in an interlock chamber mounted on the electron probe column. After the liquid nitrogen is evaporated by creating a vacuum, the sample is pushed into the special stage of the instrument. The sample is maintained at close to liquid nitrogen temperature by circulation of liquid nitrogen in the special stage.

A Liquid Nitrogen Cooled Stage for STEM

1974 ◽  
Vol 32 ◽  
pp. 444-445
Author(s):  
Louis T. Germinario
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Liquid Nitrogen ◽  
Room Temperature ◽  
Objective Lens ◽  
Thermal Drift ◽  
Specimen Holder ◽  
Resolution Capability ◽  
Focal Position

A liquid nitrogen stage has been developed for the JEOL JEM-100B electron microscope equipped with a scanning attachment. The design is a modification of the standard JEM-100B SEM specimen holder with specimen cooling to any temperatures In the range ~ 55°K to room temperature. Since the specimen plane is maintained at the ‘high resolution’ focal position of the objective lens and ‘bumping’ and thermal drift la minimized by supercooling the liquid nitrogen, the high resolution capability of the microscope is maintained (Fig.4).

Sign in / Sign up

Export Citation Format

Share Document