Viscosity kinematical coefficient

Temperature conductivity coefficient Dynamic coefficient of turbulent viscosity Kinematic coefficient of turbulent viscosity Characteristic time of turbulent mixing A pressure drop Input-output pressure drop... 

Kinematic Viscosity A coefficient defined as the ratio of the dynamic viscosity of a fluid to its density. The centistoke is the reported value of kinematic viscosity measurement. 

Keywords self-diffusion coefficient, thermal hydrodynamic fluctuations, dynamic viscosity, kinematic viscosity, Maxwellian relaxation time... 

One method (ASTM D-2501) describes the calculation of the viscosity-gravity coefficient (VGC)—a parameter derived from kinematic viscosity and density that has been found to relate to the saturate/aromatic composition. Correlations between the viscosity-gravity coefficient (or molecular weight and density) and refractive index to calculate carbon type composition in percentage of aromatic, naphthenic, and paraffinic carbon atoms are used to estimate of the number of aromatic and naphthenic rings present (ASTM D-2140, ASTM D-3238). 

Chemical potential Viscosity or viscosity coefficient Internal viscosity of fluid drop Bingham plastic viscosity Kinematic viscosity... 

The dimensions of a are the same as those of the diffusion coefficient and of the kinematic viscosity, therefore the process of heat transport due to conduction can be treated as the diffusion of heat with the diffusion coefficient a, bearing in mind that the transport mechanisms of diffusion and heat conductivities are identical. The coefficient of heat conductivity of gases increases with temperature. For the majority of liquids the value of k decreases with increasing T. Polar liquids, such as water, are an exception. For these, the dependence k(T) shows a maximum value. As well as the coefficient of viscosity, the coefficient of heat conductivity also shows a weak pressure-dependence. 

K-factor See coefficient of thermal conductivity, kieselguhr See diatomaceous earth, kinematic viscosity See viscosity, kinematic, kinetic A branch of dynamics that is concerned with the relations between the movement of bodies and the forces acting on them. See Avogadro s law reactor technology thermogravimetric analysis viscoelasticity, linear viscoelasticity, nonlinear. 

If one supposes that turbulence diffusion coefficient Dt is equal to kinematic coefficient of turbulence viscosity Vt which in its turn can be expressed by specific kinetic turbulence energy K (mVsec ) and rate of dissipation of last one is e (mVsec ) then (1.16) will be as following ... 

The theoretical description of the turbulent mixing of reactants in tubular devices is based on the following model assumptions the medium is a Newtonian incompressible medium, and the flow is axis-symmetrical and nontwisted turbulent flow can be described by the standard model [16], with such parameters as specific kinetic energy of turbulence K and the velocity of its dissipation e and the coefficient of turbulent diffusion is equal to the kinematic coefficient of turbulent viscosity D, = Vj- =... 

If the turbulent diffusion coefficient is assumed to be equal to the kinematic coefficient of turbulent viscosity Vj-, which in turn, can be expressed via the specific kinetic energy of turbulence K and its dissipation rate e, then Equation 2.13 will... 

Besides the coefficient of the dynamic viscosity rj, the coefficient of the kinematical viscosity V is used in technology there is a relation between the two coefficients the kinematical coefficient is the ratio of the dynamic viscosity to the medium density v =t]lp. The coefficient of the kinematical viscosity is measured in stokes (St) 1 St = 1 cmVsec. In SI the unit of kinematical viscosity is mVsec (1 mVsec = 1(P Cr). Some viscosity factors are given in Table 3.3. 

Coefficients a and b can also be determined from the kinematic viscosities at 100 and 210°F. 

T = temperature a, b = straight line coefficients c = kinematic viscosity log = common logarithm (base 10)... 

Viscosity is equal to the slope of the flow curve, Tf = dr/dj. The quantity r/y is the viscosity Tj for a Newtonian Hquid and the apparent viscosity Tj for a non-Newtonian Hquid. The kinematic viscosity is the viscosity coefficient divided by the density, ly = tj/p. The fluidity is the reciprocal of the viscosity, (j) = 1/rj. The common units for viscosity, dyne seconds per square centimeter ((dyn-s)/cm ) or grams per centimeter second ((g/(cm-s)), called poise, which is usually expressed as centipoise (cP), have been replaced by the SI units of pascal seconds, ie, Pa-s and mPa-s, where 1 mPa-s = 1 cP. In the same manner the shear stress units of dynes per square centimeter, dyn/cmhave been replaced by Pascals, where 10 dyn/cm = 1 Pa, and newtons per square meter, where 1 N/m = 1 Pa. Shear rate is AH/AX, or length /time/length, so that values are given as per second (s ) in both systems. The SI units for kinematic viscosity are square centimeters per second, cm /s, ie, Stokes (St), and square millimeters per second, mm /s, ie, centistokes (cSt). Information is available for the official Society of Rheology nomenclature and units for a wide range of rheological parameters (11). 

Mutual Diffusivity, Mass Diffusivity, Interdiffusion Coefficient Diffusivity is denoted by D g and is defined by Tick s first law as the ratio of the flux to the concentration gradient, as in Eq. (5-181). It is analogous to the thermal diffusivity in Fourier s law and to the kinematic viscosity in Newton s law. These analogies are flawed because both heat and momentum are conveniently defined with respec t to fixed coordinates, irrespective of the direction of transfer or its magnitude, while mass diffusivity most commonly requires information about bulk motion of the medium in which diffusion occurs. For hquids, it is common to refer to the hmit of infinite dilution of A in B using the symbol, D°g. 

A simplified estimate can be made by first converting the flow at actual conditions to the flow at standard conditions (i.e., at 70 F and 1 atm). The calculation basis for the linear velocity assumes a roughness coefficient of 0.0005 and a kinematic viscosity for air of 1.62 x lO fF/sec. From the ideal gas law, the following expression is developed ... 

The concept of kinematic viscosity is the outgrowth of the use of a head of liquid to produce a flow through a capillary tube. The coefficient of absolute viscosity, when divided by the density of the liquid is called the kinematic viscosity. In the metric system, the unit of viscosity is called the stoke and it has the units of centimeters squared per second. One one-hundredth of a stoke is a centistoke. 

Whereas the kinematic viscosity fx/p, the thermal diffusivity k/Cpp, and the diffusivity D are physical properties of the system and can therefore be taken as constant provided that physical conditions do not vary appreciably, the eddy coefficients E, Eh, and ED will be affected by the flow pattern and will vary throughout the fluid. Each of the eddy coefficients is proportional to the square of the mixing length. The mixing length will ... 

An analogy exists between mass transfer (which depends on the diffusion coefficient) and momentum transfer between the sliding hquid layers (which depends on the kinematic viscosity). Calculations show that the ratio of thicknesses of the diffnsion and boundary layer can be written as... 

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