On the thermophysical and transport properties of 3 He and 4 He: A bubble interaction potential versus state of the art
| Autor: | Henri Piel, Michael Chrysos |
|---|---|
| Přispěvatelé: | MOLTECH-Anjou, Institut de Chimie du CNRS (INC)-Université d'Angers (UA)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Scattering cross-section
[PHYS]Physics [physics] 010304 chemical physics Chemistry Bubble Analytic model General Physics and Astronomy Thermodynamics State (functional analysis) 01 natural sciences Viscosity Thermal conductivity Interaction potential Virial coefficient 0103 physical sciences Physical and Theoretical Chemistry 010306 general physics ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Chemical Physics Journal of Chemical Physics, American Institute of Physics, 2017, 147 (3), pp.034105. ⟨10.1063/1.4993222⟩ |
| ISSN: | 0021-9606 1089-7690 |
| DOI: | 10.1063/1.4993222⟩ |
| Popis: | Three keynote thermophysical and transport properties of 3He and 4He, namely, the second virial coefficient, the shear viscosity, and the thermal conductivity, are reported for the “extended Dirac bubble potential” (EDbp), a novel model for He–He [M. Chrysos, J. Chem. Phys. 146, 024106 (2017)]. Comparisons with the experiment as well as with potentials with a proven track record and with the oversimplified Dbp are being made in the range 0.1–500 K to analyze the performance of the EDbp, which is shown here to emerge as a promising analytic model for He–He. A flowchart of how to treat the “buffer” in scattering cross section measurements is designed and conducted, offering a route to EDbp optimization. An impressive consistency with state-of-the-art calculations (which is just striking for such a simple analytic model) is found, essentially thanks to the performance of the phase-shift expression cot δ l = λ k r 0 ξ l y l ( k r 0 ) − y l ( k r c ) λ k r 0 ξ l j l ( k r 0 ) − j l ( k r c ) , ξ l = j l ( k r 0 ) y l ( k r c ) − j l ( k r c ) y l ( k r 0 ) . A Multimedia view of δ l ( k , r c ) versus k and rc is part of the material presented in this article. Data for the “best” rc(k) is given as a supplementary material. |
| Databáze: | OpenAIRE |
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