Diffusivities of an Equimolar Methane–Propane Mixture Across the Two-Phase Region by Dynamic Light Scattering
The present contribution examines the accessibility of diffusivities across the two-phase region of an equimolar methane–propane mixture for dynamic light scattering (DLS) experiments. Heterodyne DLS experiments and theoretical calculations of the Rayleigh ratio were performed at 125 different therm...
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description | The present contribution examines the accessibility of diffusivities across the two-phase region of an equimolar methane–propane mixture for dynamic light scattering (DLS) experiments. Heterodyne DLS experiments and theoretical calculations of the Rayleigh ratio were performed at 125 different thermodynamic states including the gas, liquid, supercritical, and the two-phase region. The present measurements document that two diffusivities can be determined simultaneously in the liquid state and saturated liquid phase for temperatures and pressures which correspond to densities larger than 1.15 times the critical density. Based on a rigorous assignment of the signals detected in this work, the slow and fast diffusivities could be associated with the Fick and thermal diffusivities. For all other thermodynamic states, a single hydrodynamic mode or signal was obtained experimentally. With the help of theoretical Rayleigh ratios as well as from the general behavior of the diffusivities as a function of temperature and pressure, the signals were identified to be related to the Fick diffusivity in the supercritical state and to a mixed diffusivity in the gas state and the saturated vapor phase. The results are discussed in connection with the behavior of the diffusivities along certain paths in the pressure–temperature projection of the phase diagram of the mixture. |
doi_str_mv | 10.1007/s10765-020-02680-1 |
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Heterodyne DLS experiments and theoretical calculations of the Rayleigh ratio were performed at 125 different thermodynamic states including the gas, liquid, supercritical, and the two-phase region. The present measurements document that two diffusivities can be determined simultaneously in the liquid state and saturated liquid phase for temperatures and pressures which correspond to densities larger than 1.15 times the critical density. Based on a rigorous assignment of the signals detected in this work, the slow and fast diffusivities could be associated with the Fick and thermal diffusivities. For all other thermodynamic states, a single hydrodynamic mode or signal was obtained experimentally. With the help of theoretical Rayleigh ratios as well as from the general behavior of the diffusivities as a function of temperature and pressure, the signals were identified to be related to the Fick diffusivity in the supercritical state and to a mixed diffusivity in the gas state and the saturated vapor phase. 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Heterodyne DLS experiments and theoretical calculations of the Rayleigh ratio were performed at 125 different thermodynamic states including the gas, liquid, supercritical, and the two-phase region. The present measurements document that two diffusivities can be determined simultaneously in the liquid state and saturated liquid phase for temperatures and pressures which correspond to densities larger than 1.15 times the critical density. Based on a rigorous assignment of the signals detected in this work, the slow and fast diffusivities could be associated with the Fick and thermal diffusivities. For all other thermodynamic states, a single hydrodynamic mode or signal was obtained experimentally. With the help of theoretical Rayleigh ratios as well as from the general behavior of the diffusivities as a function of temperature and pressure, the signals were identified to be related to the Fick diffusivity in the supercritical state and to a mixed diffusivity in the gas state and the saturated vapor phase. The results are discussed in connection with the behavior of the diffusivities along certain paths in the pressure–temperature projection of the phase diagram of the mixture.</description><subject>Classical Mechanics</subject><subject>Condensed Matter Physics</subject><subject>Diffusivity</subject><subject>Geophysics</subject><subject>Industrial Chemistry/Chemical Engineering</subject><subject>Liquid phases</subject><subject>Methane</subject><subject>Phase diagrams</subject><subject>Photon correlation spectroscopy</subject><subject>Physical Chemistry</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Propane</subject><subject>Scattering</subject><subject>Thermodynamics</subject><subject>Vapor phases</subject><issn>0195-928X</issn><issn>1572-9567</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>C6C</sourceid><recordid>eNp9kMtOAjEUhhujiYi-gKsmrkd7mc5lSQAvCUSimLhrOp0OUwJTaDsqO9_BN_RJLIyJOxfnsvj_c_J_AFxidI0RSm8cRmnCIkRQqCRDET4CPcxSEuUsSY9BD-GcRTnJXk_BmXNLhFCe5rQHzEhXVev0m_ZaOWgqKBo43rZ6bVbCwqnytWjU9-fXzJpN2OBUf_jWKjiQ1jgHfa3g_N1Es1o4BZ_UQpsGFjs42jVirSWc6EXt4bMU3iurm8U5OKnEyqmL39kHL7fj-fA-mjzePQwHk0jGCPlIkSxmmMUJkXFJCWKhVTQtZEmpyEiBsRRSYFJUSV6SQtKcCVwKrMpYCioU7YOr7u7Gmm2rnOdL09omvOQkRklAk7EkqEinOoSxquIbq9fC7jhGfA-Wd2B5AMsPYDkOJtqZ3GafSNm_0_-4fgBcgH2g</recordid><startdate>2020</startdate><enddate>2020</enddate><creator>Piszko, Maximilian</creator><creator>Giraudet, Cédric</creator><creator>Fröba, Andreas P.</creator><general>Springer US</general><general>Springer Nature B.V</general><scope>C6C</scope><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0003-2051-7042</orcidid><orcidid>https://orcid.org/0000-0002-7929-8035</orcidid><orcidid>https://orcid.org/0000-0002-9616-3888</orcidid></search><sort><creationdate>2020</creationdate><title>Diffusivities of an Equimolar Methane–Propane Mixture Across the Two-Phase Region by Dynamic Light Scattering</title><author>Piszko, Maximilian ; Giraudet, Cédric ; Fröba, Andreas P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c400t-e284515462c4d3205d32f37bcd33a82b11caca12bf69d2bc395a1da1ed4ca3ae3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Classical Mechanics</topic><topic>Condensed Matter Physics</topic><topic>Diffusivity</topic><topic>Geophysics</topic><topic>Industrial Chemistry/Chemical Engineering</topic><topic>Liquid phases</topic><topic>Methane</topic><topic>Phase diagrams</topic><topic>Photon correlation spectroscopy</topic><topic>Physical Chemistry</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>Propane</topic><topic>Scattering</topic><topic>Thermodynamics</topic><topic>Vapor phases</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Piszko, Maximilian</creatorcontrib><creatorcontrib>Giraudet, Cédric</creatorcontrib><creatorcontrib>Fröba, Andreas P.</creatorcontrib><collection>Springer Nature OA Free Journals</collection><collection>CrossRef</collection><jtitle>International journal of thermophysics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Piszko, Maximilian</au><au>Giraudet, Cédric</au><au>Fröba, Andreas P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Diffusivities of an Equimolar Methane–Propane Mixture Across the Two-Phase Region by Dynamic Light Scattering</atitle><jtitle>International journal of thermophysics</jtitle><stitle>Int J Thermophys</stitle><date>2020</date><risdate>2020</risdate><volume>41</volume><issue>7</issue><artnum>102</artnum><issn>0195-928X</issn><eissn>1572-9567</eissn><abstract>The present contribution examines the accessibility of diffusivities across the two-phase region of an equimolar methane–propane mixture for dynamic light scattering (DLS) experiments. Heterodyne DLS experiments and theoretical calculations of the Rayleigh ratio were performed at 125 different thermodynamic states including the gas, liquid, supercritical, and the two-phase region. The present measurements document that two diffusivities can be determined simultaneously in the liquid state and saturated liquid phase for temperatures and pressures which correspond to densities larger than 1.15 times the critical density. Based on a rigorous assignment of the signals detected in this work, the slow and fast diffusivities could be associated with the Fick and thermal diffusivities. For all other thermodynamic states, a single hydrodynamic mode or signal was obtained experimentally. With the help of theoretical Rayleigh ratios as well as from the general behavior of the diffusivities as a function of temperature and pressure, the signals were identified to be related to the Fick diffusivity in the supercritical state and to a mixed diffusivity in the gas state and the saturated vapor phase. The results are discussed in connection with the behavior of the diffusivities along certain paths in the pressure–temperature projection of the phase diagram of the mixture.</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s10765-020-02680-1</doi><orcidid>https://orcid.org/0000-0003-2051-7042</orcidid><orcidid>https://orcid.org/0000-0002-7929-8035</orcidid><orcidid>https://orcid.org/0000-0002-9616-3888</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Classical Mechanics Condensed Matter Physics Diffusivity Geophysics Industrial Chemistry/Chemical Engineering Liquid phases Methane Phase diagrams Photon correlation spectroscopy Physical Chemistry Physics Physics and Astronomy Propane Scattering Thermodynamics Vapor phases |
title | Diffusivities of an Equimolar Methane–Propane Mixture Across the Two-Phase Region by Dynamic Light Scattering |
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