Temperature-dependence correlations of vapor pressure and acentric factor for normalhydrogen(n-H2), orthohydrogen(o-H2) and parahydrogen(p-H2), have been formulated. The obtained correlations are statistically excellent. The characteristic parameters such as the Pitzer’s acentric factor, Riedel’s parameter, Filippov’s parameter have been determined for n-H2, o-H2 and p-H2. And, the curvatures of vapor pressure curve for n-H2, o-H2 and p-H2 have been determined in a wide range of temperature. It is found that the curvatures of vapor pressure curve for n-H2, o-H2 and p-H2 have a maximum at about 17.11K, 17.12K and 17.00K, respectively.
Cryogenic viscous pump (CVP) is also known as fore pump that are mainly designed for the separation of hydrogen isotopes from the helium during the process of regeneration of cryo- pumps. This model will determine the amount of hydrogen which is extracted by supercritical helium cooled pump. It also includes flow rates and inlet conditions that are related to the hydrogen gas flow. This hemisphere model (HM) determines the amount and location which are extracted by the pump as the function of time. During the development of this model the calibration check done for its results, later it has been compared with the measurements of CFP prototype. At the result of this model, it will demonstrate the quantity of hydrogen which is very sensitive to the inlet temperature that is found outside of the Cryopump. Finally, this model will represent the efficient outcome.
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