Viscosity depends strongly on temperature. In liquids it usually decreases with increasing temperature, whereas, in most gases, viscosity increases with increasing temperature. This article discusses several models of this dependence, ranging from rigorous first-principles calculations for monatomic gases, to empirical correlations for liquids.
Understanding the temperature dependence of viscosity is important for many applications, for instance engineering lubricants that perform well under varying temperature conditions (such as in a car engine), since the performance of a lubricant depends in part on its viscosity. Engineering problems of this type fall under the purview of tribology.
Here dynamic viscosity is denoted by and kinematic viscosity by . The formulas given are valid only for an absolute temperature scale; therefore, unless stated otherwise temperatures are in kelvins.
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to empirical correlations for liquids. Understanding the temperaturedependenceofviscosity is important for many applications, for instance engineering...
Dynamic viscosity is a material property which describes the resistance of a fluid to shearing flows. It corresponds roughly to the intuitive notion of a fluid's...
several approximations for certain materials — see, e.g., temperaturedependenceofviscosity. When M → 0 {\displaystyle \mathrm {M} \rightarrow 0} and...
Volume viscosity (also called bulk viscosity, or second viscosity or, dilatational viscosity) is a material property relevant for characterizing fluid...
from its dependenceof pressure and temperature, the second viscosity coefficient also depends on the process, that is to say, the second viscosity coefficient...
(2015). "Temperaturedependence and chain length effect on density and viscosityof binary mixtures of nitrobenzene and 2-alcohols". Journal of Molecular...
corresponding absolute temperatures, μ is the dynamic viscosityof the solvent. The dependenceof the diffusion coefficient on temperature for gases can be...
component and a viscous component. The viscosityof a viscoelastic substance gives the substance a strain rate dependence on time. Purely elastic materials...
freezing point (in order to stay liquid within a wide range oftemperature) A high viscosity index Thermal stability Hydraulic stability Demulsibility Corrosion...
kinematic viscosity ν of the fluid, size of the body, expressed in terms of its wetted area A, and drag force Fd. Using the algorithm of the Buckingham...
In particular, the temperaturedependenceof the viscosityof liquid metals may range from the standard Arrhenius law dependence, to a much steeper (non-Arrhenius)...
liquids of differing viscosities in precise ratios. In addition, various additives exist which can modulate the temperature-dependenceof the viscosityof lubricating...
viscosity. Experiments suggest that the transition takes place at a temperature between 1,200 and 1,170 °C (2,190 and 2,140 °F), with some dependence...
properties used in determining the type of a gemstone. Due to the dependenceof the refractive index on the wavelength of the light used (i.e. dispersion),...
interface between two phases due to a gradient of the surface tension. In the case oftemperaturedependence, this phenomenon may be called thermo-capillary...
occurs after nucleate boiling, the minimum temperature for film boiling should have a proportional dependence on the surface tension. Henry developed a...
conclusion. Compared to the other states of matter, gases have low density and viscosity. Pressure and temperature influence the particles within a certain...
one of several uses of the QCM. Measurements ofviscosity and more general, viscoelastic properties, are of much importance as well. The "non-gravimetric"...
temperature dependenceofviscosityof glass, structural and stress viscoelastic relaxation of glass play an important role in determination of lens preform...
determined. The temperaturedependence for λL originates from the variety of processes, whose significance for λL depends on the temperature range of interest...
temperature dependency of the viscosity. For such interaction potentials, significantly more accurate results are obtained by numerical evaluation of...
polymer of small amounts of a solvent (plasticizer) reduces the temperatureof glass transition, the yield temperature, and the viscosityof a melt. An...
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