Temperature and Density Dependence of the Viscosity of Cyclopentane

Harris, Kenneth R.; Newitt, and Paula J.; Woolf, L. A.

doi:10.1021/je034142v

Cited by 31 publications

(37 citation statements)

References 20 publications

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“…Lennard-Jones parameters were obtained from the method of Chung et al (Chung et al, 1988) Viscosity data from several sources (Assael & Dalaouti, 2000; K. R. Harris, Newitt, & Woolf, 2004;Kurihara, Kandil, Marsh, & Goodwin, 2007;Lambert et al, 1955;R. F. Ma et al, 2003) were used to obtain the coefficients in Table 2, and Figures 69 and 70 give deviation plots as a function of temperature and pressure respectively.…”

Section: Cyclopentanementioning

confidence: 99%

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

Huber¹

2018

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We describe models for the viscosity, thermal conductivity, and surface tension for selected fluids implemented in version 10.0 of the NIST computer program, NIST Standard Reference Database 23, also known as NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP). These fluids do not presently have published reference fluid quality models in the open literature, so we provide preliminary models based on available data as an interim measure to allow calculations of these properties. Comparisons with available experimental data are given.

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Section: Cyclopentanementioning

confidence: 99%

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

Huber¹

2018

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“…Note that this power form can also approximately describe the density dependence of viscosity for classical liquids. 51,52 Since there is no known analytic form for function α(T), it must be obtained by calibration against the experimentally available electron mobility data. 14 The following empirical form was used to approximate the temperature dependence:…”

Section: A Density Functional Theory Modelmentioning

confidence: 99%

Theoretical modeling of electron mobility in superfluid 4He

Aitken

Bonifaci

Haeften

et al. 2016

The Journal of Chemical Physics

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The Orsay-Trento bosonic density functional theory model is extended to include dissipation due to the viscous response of superfluid (4)He present at finite temperatures. The viscous functional is derived from the Navier-Stokes equation by using the Madelung transformation and includes the contribution of interfacial viscous response present at the gas-liquid boundaries. This contribution was obtained by calibrating the model against the experimentally determined electron mobilities from 1.2 K to 2.1 K along the saturated vapor pressure line, where the viscous response is dominated by thermal rotons. The temperature dependence of ion mobility was calculated for several different solvation cavity sizes and the data are rationalized in the context of roton scattering and Stokes limited mobility models. Results are compared to the experimentally observed "exotic ion" data, which provides estimates for the corresponding bubble sizes in the liquid. Possible sources of such ions are briefly discussed.

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“…Together with the addition of the PBA and the phase change of excess water, the process first results in a porous formation and then the desired structural rigidity. We used cyclopentane (Table ) as the PBA, and interested readers are referred to references, which include the detailed properties as functions of temperature and have a better idea of the physical processes like evaporation, transport. The present simplified mechanism involves four reactions and eight species, including isocyanate, polyol, polyurethane, water, carbamic acid, amine, carbon dioxide, and urea,…”

Section: Chemistrymentioning

confidence: 99%

“…When the input materials are mixed in accordance with a specific recipe, they are rapidly converted by the chemical process into the final form of the polyurethane foam. Besides the chemical blowing agent, carbon dioxide (which is released as a result of reactions), physical blowing agents (PBAs), like cyclopentane, can be used to speed up the expansion of the foam . Evaporation of excess water also supports the foam growth.…”

Section: Introductionmentioning

confidence: 99%

Effects of composition and temperature of initial mixture on the formation and properties of polyurethane foam

Özdemir

Akar

2017

Adv Polym Technol

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The purpose of the study is to optimize the initial conditions of the molding process of a multicomponent mixture into a refrigerator cabinet. Polyurethane foaming has been studied with different starting compositions and temperatures of the initial mixture. The kinetic mechanism has involved four reactions and species species. Using a standard recipe, the chemical kinetics and the numerical implementation have been first validated against the experimental values of the filling time and the density of the final foam. Thereafter, 11,763 different initial conditions are calculated. The results put in evidence that the filling time can be reduced without any significant change in the precursors of the rigidity of the foam. The final temperature of the foam has always remained lower than the limiting temperature so that thermal material deformations in the walls of the cabinet can be avoided. Increasing the physical blowing agent mass fraction beyond the standard recipe does not appear to be a useful option.

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Temperature and Density Dependence of the Viscosity of Cyclopentane

Cited by 31 publications

References 20 publications

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

Theoretical modeling of electron mobility in superfluid 4He

Effects of composition and temperature of initial mixture on the formation and properties of polyurethane foam

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