Volume 73, A polynomial 3 model type equation has been found as the best one to predict paraffin viscosity. Proceedings of the Physical Society (1958-1967), You will only need to do this once. In general, the paraffin-specific pressure drop in a horizontal pipe is approximately 1.4–6.0 times that of water at the same temperatures. the Altmetric Attention Score and how the score is calculated. Paraffin utilized in environmental control systems for thermal energy storage and transfer was viable. It's reported as a viscous liquid at 20 degrees. The binary model provides an effective definition of the rheological properties of the paraffin in the non-power-law phase (the corresponding material temperatures range from 291.15 K to 288.15 K). Residual viscosity, the viscosity at a given pressure and temperature minus the dilute gas viscosity at the same temperature, has been found to be independent of temperature for pure components and mixtures for simple molecules and light hydrocarbons. The high thermal expansion coefficient and low viscosity of paraffin wax, at temperatures above 50/sup 0/C, are utilized to induce natural convection in the liquid phase even at small thicknesses. You do not need to reset your password if you login via Athens or an Institutional login. Find out more about journal subscriptions at your site. Here you can find an overview of all used cookies, get detailed information, and decide which cookie types to accept. Necessary cookies enable the basic functioning of the website. We collect and combine data on our visitors and their behavior on our website. This article is cited by 1 publications. In lieu of an abstract, this is the article's first page. A polynomial 3 model type equation has been found as the best one to predict paraffin viscosity. https://doi.org/10.1016/j.ijrefrig.2017.04.001. . The design of a TES system does not only rely on the energy density that a PCM can provide, but also on other important material properties such as its rheological behavior when the PCM is melted. Therefore, a new phenomenological model of binary-series viscosity is proposed. The residual viscosities for methane, ethane, propane and four mixtures were correlated as a function of reduced density and molecular weight. Published under licence by IOP Publishing Ltd This site uses cookies. White Oil/Liquid Paraffin Oil Panama Petrochem Ltd, Manufactures White Oils from low pour point severely Hydro treated Base Oils, ranging from low viscosity to very high viscosity grades. To gain access to this content, please complete the Recommendation https://doi.org/10.1007/978-3-662-43324-9_1, https://doi.org/10.1016/0095-8522(46)90047-5. improved equation #'a = Belup gives less satisfactory results. Please reconnect. Viscometric properties of higher fatty acids and their derivatives. Thermal energy storage (TES) systems using phase change materials (PCM) are nowadays widely developed to be applied in solar power plants or cooling and domestic comfort services. The viscosity tables show examples for different candle waxes and for different wax types used in the food industry. Measured with SVM™. Andrade's improved equation ην1/3 = Bec/vT gives less satisfactory results. The theory of viscosity of dense fluids using the nonequilibrium statistical mechanical approach has been developed by Kirkwood and by Born and Green. In the experiments, when the paraffin temperature is greater than 291.15 K, the rheological behaviours of the paraffin obey the power-law principles. By continuing you agree to the use of cookies. As paraffin are one of the most common PCM types used, the present paper evaluates the rheology of four commercial paraffin with different phase change temperatures in order to find out an empirical equation for the whole paraffin family. An empirical equation for paraffin PCM viscosity calculation is presented. If you have a user account, you will need to reset your password the next time you login. Please note: If you switch to a different device, you may be asked to login again with only your ACS ID. Find more information about Crossref citation counts. All rights reserved. New model provided an effective definition of the rheological properties of the paraffin in the non-power-law phase. These metrics are regularly updated to reflect usage leading up to the last few days. We use cookies on our website. Get article recommendations from ACS based on references in your Mendeley library. With the decrease in paraffin temperature, its viscosity coefficient increases while its rheological behaviour index decreases. Thodos and co-workers applied the residual viscosity concept to the viscosity of pure monatomic and diatomic gases. As paraffin are one of the most common PCM types used, the present paper evaluates the rheology of four commercial paraffin with different phase change temperatures in order to find out an empirical equation for the whole paraffin family. Please choose one of the options below. Temp Scan on candle wax measured with SVM™ 3001. 1 indicates that the residual viscosity of a given substance would not appear as a unique function of the density, but is a function of the dilute gas viscosity value at the temperature under consideration times a function of the density which is independent of the temperature. Kinematic Viscosity The ratio of the absolute viscosity of a liquid to its density frequently occurs in the study of viscosity and hydraulics and the term "kinematic viscosity" with the symbol V has been assigned to it where p is the density. Copyright © 2020 Elsevier B.V. or its licensors or contributors. It is used for making candles, coatings, lubricants, separating agents, in the food industry (food-grade paraffin wax), in the pharmaceutical industry and for many other purposes. Export citation and abstract Find out more. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Eakin correlated the residual viscosity of methane, ethane, propane and n-butane empirically as a function of density and molecular weight. Ellington and co-workers made the residual viscosity vs density plots for ethane and propane, but omitted the region below a residual viscosity of 15 micropoise and showed a systematic separation of the ethane isotherms in the low density region. Soc. The computer you are using is not registered by an institution with a subscription to this article. The most serious obstacle to the development of a generalized corresponding states representation of viscosity data, even for simple molecules, has been the limited quantity of precise viscosity data of pure components and mixtures over a wide range of pressure and temperature conditions. Purchase this article from our trusted document delivery partners.

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