Mass Diffusivity (liquid)

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$D_(T_1) = ( T_1 * mu_(T_2) * D_(T_2) ) / ( T_2 * mu_(T_1) )$

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The Mass Diffusivity of a Liquid calculator computes the diffusivity based on two liquids with two temperatures and dynamic viscosities and the diffusivity of one of them.

INSTRUCTIONS: Choose units and enter the following:

$D_(T_1)$ - the diffusion coefficient of the liquid substance 1 at Temperature $T_1$
$D_(T_2)$ - the diffusion coefficient of the substance 2 at Temperature $T_2$
$T_1$ - temperature of substance 1
$T_2$ - temperature of substance 2
$mu_(T_1)$ - the dynamic viscosity of the substance 1
$mu_(T_2)$ - the dynamic viscosity of the substance 2

Mass Diffusivity of a Liquid (D_T1): The diffusivity is returned in stokes (cm²/s).

Diffusivity Equation

Mass Diffusivity of a Liquid
Mass Diffusivity of a Solid
Mass Diffusivity of a Gas

The Math / Science

The Mass Diffusivity of Liquid equation computes the mass diffusivity or diffusion coefficient for a pair of liquid substances, each with a specified temperature. The formula for the mass diffusivity of a liquid is:

$D_(T_1) = D_(T_2) * (T_1 * mu_(T_2))/ (T_12 * mu_(T_1))$

where:

$D_(T_1)$ - the diffusion coefficient of the liquid substance 1 at Temperature $T_1$
$D_(T_2)$ - the diffusion coefficient of the substance 2 at Temperature $T_2$
$T_1$ - temperature of substance 1
$T_2$ - temperature of substance 2
$mu_(T_1)$ - the dynamic viscosity of the substance 1
$mu_(T_2)$ - the dynamic viscosity of the substance 2

The diffusivity or diffusion coefficient characterizes the relationship between the molar flux due to molecular diffusion and the gradient force of a c concentration of the material's molecules that drives diffusion.

Diffusivity is specified for one substance relative to another. In this case there are two substances labeled substance 1 and substance 2. Each of the two substances is at a different temperature and at that temperature exhibits a characteristic of dynamic viscosity.