Functional sensitivity analysis approach to retrieve the potential energy function from the quantum second virial coefficient

Costa, Éderson D'Martin; Braga, J. P.; Lemes, Nelson H. T.

doi:10.1016/j.physa.2019.122539

Cited by 1 publication

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“…Accurate theoretical modelling of a high-pressure pneumatic catapult is a prerequisite condition for the design and implementation of such systems. Many equations have been proposed to describe the properties of real gases, including the van der Waals equation [ 12 , 13 ], the virial equation [ 14 ], the Redlich–Kwong equation [ 15 ], the Benedict–Webb–Rubin equation [ 16 ], the Soave–Redlich–Kwong equation [ 17 ], and the Peng–Robinson equation of state [ 18 , 19 ], which are applicable to gases within a certain pressure and temperature range.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Theoretical Modelling of a High-Pressure Pneumatic Catapult Considering Dynamic Leakage and Convection

Ren

Zhong

Yao³

et al. 2020

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A high-pressure pneumatic catapult works under extreme boundaries such as high-pressure and rapid change of pressure and temperature, with the features of nonlinearity and gas-solid convection. In the thermodynamics processes, the pressure is much larger than the critical pressure, and the compressibility factor can deviate from the Zeno line significantly. Therefore, the pneumatic performance and thermo-physical properties need to be described with the real gas hypothesis instead of the ideal gas one. It is found that the analytical results based on the ideal gas model overestimate the performance of the catapult, in comparison to the test data. To obtain a theoretical model with dynamic leakage compensation, leakage tests are carried out, and the relationship among the leakage rate, pressure and stroke is fitted. The compressibility factor library of the equation of state for compressed air is established and evaluated by referring it to the Nelson-Obert generalized compressibility charts. Based on the Peng–Robinson equation, a theoretical model of the high-pressure pneumatic catapult is developed, in which the effects of dynamic leakage and the forced convective heat transfer between the gas and the metal wall are taken into account. The results from the theoretical model are consistent with the data from ejection tests. This research presents an approach to study the performance of a high-pressure pneumatic catapult with high precision.

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