Diffusivity, mass diffusivity or diffusion coefficient is usually written as the proportionality constant between the molar flux due to molecular diffusion...

different mediums. Diffusivity may refer to: Thermal diffusivity, diffusivity of heat Diffusivity of mass: Mass diffusivity, molecular diffusivity (often called...

is the ratio of the shear component for diffusivity (viscosity divided by density) to the diffusivity for mass transfer D. It physically relates the relative...

ratio of thermal diffusivity to mass diffusivity. It is used to characterize fluid flows where there is simultaneous heat and mass transfer. The Lewis...

can also be used in the study of mass diffusion, in which the thermal diffusivity is replaced by the mass diffusivity. The Fourier number is used in analysis...

Thermal diffusivity and thermal effusivity are related concepts and quantities used to simulate non-equilibrium thermodynamics. Diffusivity is the more...

as transport properties such as viscosity, thermal conductivity and mass diffusivity. The basic version of the model describes an ideal gas. It treats the...

concentration for mass transfer, temperature for heat transfer), D is the diffusivity (also called diffusion coefficient), such as mass diffusivity for particle...

the mass and heat fluxes, and D {\displaystyle D} and k t {\displaystyle k_{t}} are the mass diffusivity and thermal conductivity. The fact that mass, momentum...

Self-diffusion describes the diffusive motions of molecules within themselves e.g. the movement of a water molecule in water. According to the IUPAC definition...

{\mbox{Total mass transfer rate}}{\mbox{Diffusion rate}}}} where L is a characteristic length (m) D is mass diffusivity (m2 s−1) h is the convective mass transfer...

SI units), molar mass M A {\displaystyle M_{A}} is expressed in units of kg/mol, and temperature T (in kelvins). Knudsen diffusivity D K A {\displaystyle...

kinematic viscosity. D is the mass diffusivity. ε is the rate of dissipation of turbulence kinetic energy per unit mass. Similar to the Kolmogorov microscales...

it to expand in all directions without rupture. Mass diffusivity: Ability of one substance to diffuse through another Plasticity: Ability of a material...

number (i.e. a nonzero magnetic diffusivity) is associated with violation of Alfvén's theorem. The magnetic diffusivity has SI units of m²/s and is defined...

permeate, a material's intrinsic permeability, and the materials' mass diffusivity. Permeation is modeled by equations such as Fick's laws of diffusion...

diffusion occurs much faster than lattice diffusion. Kirkendall effect Mass diffusivity Heitjans, P.; Karger, J., eds. (2005). Diffusion in condensed matter:...

transfer, the comparison is between viscous diffusivity ( ν {\displaystyle {\nu }} ) and mass Diffusivity ( D {\displaystyle {D}} ), given by the Schmidt...

{k_{c}}}  : convective mass transfer coefficient (analogous to the h of the heat transfer problem) D {\displaystyle D}  : mass diffusivity (analogous to the...

mass transfer the Prandtl number is replaced by the Schmidt number, Sc, which expresses the ratio of the momentum diffusivity to the mass diffusivity...

probability of displacement q {\displaystyle q} , is interpreted as mass diffusivity D: D = ∫ − ∞ ∞ q 2 2 τ φ ( q ) d q . {\displaystyle D=\int _{-\infty...

ratio of momentum diffusivity to thermal diffusivity. The Prandtl number is given as: P r = ν α = momentum diffusivity thermal diffusivity = μ / ρ k / ( c...

thermal diffusivity The Be number plays in forced convection the same role that the Rayleigh number plays in natural convection. In the context of mass transfer...

now neglect the molecular diffusivity K 0 {\textstyle K_{0}} , since it is usually significantly smaller than eddy diffusivity, and would steer attention...

_{L}\,\mathrm {Pr} ,} where Pr the Prandtl number, and α the thermal diffusivity, α = k ρ c p , {\displaystyle \alpha ={\frac {k}{\rho c_{p}}},} where...

raffinate and strip product is differentiated. With a typical liquid mass diffusivity in the order of 10−9 m2/s, the characteristic time for diffusion through...

momentum diffusivity. In the energy balance this is replaced by thermal diffusivity α = k / ρ C P {\displaystyle \alpha ={k/\rho C_{P}}} , and by mass diffusivity...

become significant below ~0.4 Tmelt in FCC metals. Kirkendall effect Mass diffusivity P. Heitjans, J. Karger, Ed, “Diffusion in condensed matter: Methods...

numbers in transport phenomena of mass, momentum, and energy are principally analyzed by the ratio of effective diffusivities in each transport mechanism....

number is the dimensionless number for the ratio of momentum diffusivity to thermal diffusivity. The thermal entrance length for a fluid with a Prandtl number...