Navigation by alphabet

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
G-type shells in shell-and-tube heat exchangers: Gaddis, E S, Galerkin method, for heat conduction finite-element calculations, Galileo number, Gas-liquid flows: Gas-liquid-solid interfaces, fouling at, Gas-solid interfaces, fouling at, Gas tungsten arc welding, Gaseous fuels, properties of, Gases:
as constituent of multiphase flows, density of pure, diffusion coefficients in, emissivity of, emissivity of combustion product mixtures of isothermal, radiative heat transfer in, nonisothermal, radiative heat transfer in, radiation properties, superheated, thermodynamic properties of, tables, transport properties tables: for low pressure, viscosity of,
Viscosity of Pure Fluids at low pressure, effect of pressure on,
Gaskets: Gauss-Seidel method, for solution of implicit equations, Geometric optics models for radiative heat transfer from surfaces, geothermal brines, fouling of heat exchangers by, Germany, Federal Republic of, mechanical design of heat exchangers in: Gersten, K, Girth flanges, in shell-and-tube heat exchangers, Glass production, furnaces and kilns for, Glycerol (glycerine): Gn (heat generation number), Gnielinski, V Gnielinski correlation, for heat transfer in tube banks, Gomez-Thodas method, for vapour pressure, Goodness factor, as a basis for comparison of plate fin heat exchanger surfaces, Goody narrow band model for gas radiation properties, Gorenflo correlation, for nucleate boiling, Gowenlock, R, Graetz number: Granular products, moving, heat transfer to, Graphite, density of, Grashof number Gravitational acceleration, effect in pool boiling, Gravity conveyor: Gregorig effect in enhancement of condensation, Grid baffles: Grid selection, for finite difference method, Griffin, J M, Groeneveld correlation for postdryout heat transfer, Groeneveld and Delorme correlation for postdryout heat transfer, Gross plastic deformation Group contribution parameters tables, Guerrieri and Talty correlations for forced convective heat transfer in two-phase flow, Gungor and Winterton correlation, for forced convective boiling, Gylys, J,

Index

HEDH
A B C D E F G
G-type shells in shell-and-tube heat exchangers: Gaddis, E S, Galerkin method, for heat conduction finite-element calculations, Galileo number, Gas-liquid flows: Gas-liquid-solid interfaces, fouling at, Gas-solid interfaces, fouling at, Gas tungsten arc welding, Gaseous fuels, properties of, Gases:
as constituent of multiphase flows, density of pure, diffusion coefficients in, emissivity of, emissivity of combustion product mixtures of isothermal, radiative heat transfer in, nonisothermal, radiative heat transfer in, radiation properties, superheated, thermodynamic properties of, tables, transport properties tables: for low pressure, viscosity of,
Viscosity of Pure Fluids at low pressure, effect of pressure on,
Gaskets: Gauss-Seidel method, for solution of implicit equations, Geometric optics models for radiative heat transfer from surfaces, geothermal brines, fouling of heat exchangers by, Germany, Federal Republic of, mechanical design of heat exchangers in: Gersten, K, Girth flanges, in shell-and-tube heat exchangers, Glass production, furnaces and kilns for, Glycerol (glycerine): Gn (heat generation number), Gnielinski, V Gnielinski correlation, for heat transfer in tube banks, Gomez-Thodas method, for vapour pressure, Goodness factor, as a basis for comparison of plate fin heat exchanger surfaces, Goody narrow band model for gas radiation properties, Gorenflo correlation, for nucleate boiling, Gowenlock, R, Graetz number: Granular products, moving, heat transfer to, Graphite, density of, Grashof number Gravitational acceleration, effect in pool boiling, Gravity conveyor: Gregorig effect in enhancement of condensation, Grid baffles: Grid selection, for finite difference method, Griffin, J M, Groeneveld correlation for postdryout heat transfer, Groeneveld and Delorme correlation for postdryout heat transfer, Gross plastic deformation Group contribution parameters tables, Guerrieri and Talty correlations for forced convective heat transfer in two-phase flow, Gungor and Winterton correlation, for forced convective boiling, Gylys, J,
H I J K L M N O P Q R S T U V W X Y Z
G Gases: viscosity of,
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Viscosity of Pure Fluids

DOI 10.1615/hedhme.a.000501

5.1.4 Viscosity of pure fluids

A. Fenghour

A. Introduction

When a shearing stress is applied to a confined fluid, a velocity gradient develops within the fluid which then starts to move. The maximum velocity occurs where the stress is applied. Viscosity is a measure of the internal friction of the fluid which opposes dynamic change in the fluid; the higher the friction the higher the viscosity. Viscosity is formally defined as the ratio of the shearing stress per unit area over the velocity gradient. The SI unit of viscosity is N·s/m2 (also Pa·s). In practice, the Non-SI poise (P) and cP (0.01 P) are widely used. 1 P is equivalent to 0.1 N·s/m2.

The ratio of viscosity to density is known as kinematic viscosity. Its SI unit is m2/s. The non-SI unit of stoke is widely used. 1 stoke is equivalent to 0.0001 m2/s.

The viscosity is independent of shear rate in Newtonian fluids which include most gases and low molar mass fluids of engineering importance. Fluids for which the viscosity depends on the shear rate are called non-Newtonian fluids and are outside the scope of this paper.

Viscosity plays a major role in the design of pumping systems, heat and mass transfer applications and the optimal selection of process equipment. A review of the viscosity correlations of practical nature is given by Poling et al. (2001).

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