Conveners
C3PoF - Fluid Mechanics, Heat Transfer and Cryogen Properties II
- Adam Swanger (NASA / KSC)
- Ram Dhuley (FNAL)
Supercritical helium is often used to reduce the temperature fluctuation caused by the second stage of the G-M cryocooler, however the natural convection of the supercritical helium has a great influence on the suppression of the temperature oscillation.To do experimental research on the effect of natural convection on temperature fluctuation suppression, three different forms of helium pots...
Liquid hydrogen has excellent physical properties, high latent heat and low viscosity of liquid, as a coolant for high critical temperature superconductors like MgB2. The knowledge of DNB (Departure from Nucleate Boiling) heat flux of liquid hydrogen is necessary for design and cooling analysis of high critical temperature superconducting devices.
In this paper, DNB heat fluxes of liquid...
Long-term preservation of cells and tissues require adequate freezing protocols in order to increase viability after storage in liquid nitrogen temperatures. Way of cooling down the biological material to cryogenic temperatures is noticed as a most dangerous stage in preservation. Possible cryo-injuries caused by direct action of ice or volumetric increase inside the single cell are formed...
Chill down of cryogenic transfer lines is a crucial part of cryogenic propulsion as chill down ensures transfer of single phase fluid to the storage tanks of cryogenic engine as well as also ensures single phase liquid flow during start of the engine. Chill down time depends on several parameters such as length of the pipe, pipe size, orientation, mass flux etc. For all these experiments,...
The knowledge of forced flow heat transfer characteristics of liquid hydrogen (LH2) is important and necessary for design and cooling analysis of high critical temperature superconducting devices. However, there is few test facility of LH2 forced flow cooling for superconductors. We have already developed such a test system that it can make a LH2 forced flow (~10 m/s) of short period (less...
In refrigeration applications, hydrocarbons have high thermodynamic performances and belong to the group of natural refrigerants. Especially in mixture Joule-Thomson low temperature refrigerators (MJTR), hydrocarbons (methane, ethane, propane and butane) are the main components and have acquired wide applications.
A brief literature survey is made on the flow condensation study of...
As one kind of natural refrigerants, R170 and its mixtures can be used to replace R22 and R503 in some refrigerators and heat pump systems. For example, R170 is an important component of mixed-refrigerants for the low-temperature Joule-Thomson refrigerator. With various mixed-components, the system can achieve different performances. Accurate knowledge of the heat transfer of pure fluids is...
