eddy diffusivity

eddy diffusivity

[′ed·ē di‚fyü′siv·əd·ē]
(fluid mechanics)
The exchange coefficient for the diffusion of a conservative property by eddies in a turbulent flow. Also known as coefficient of eddy diffusion; eddy-diffusion coefficient.
References in periodicals archive ?
There are two approaches such as the eddy diffusivity model and the surface renewal model which is widely used to model heat transfer at wall boundary (Tricoli, 1999).
An analytical model using eddy diffusivity is applied for predicting droplet concentration distribution and liquid film formation in a Venturi scrubber.
Keywords: venturi scrubber, eddy diffusivity, liquid film
Amount of liquid film is a complex function of gas velocity, liquid to gas ratio, liquid jet penetration and geometrical configuration of Venturi scrubber, and eddy diffusivity of droplets.
By matching experimental data of film formation and theoretical values, one can determine eddy diffusivity of droplets.
Our model is based on a two-dimensional dispersion of droplets by convection and eddy diffusivity.
Then by using these values a correlation has been developed for eddy diffusivity as a function of operating parameters such as gas throat velocity, liquid jet penetration length and axial distance from injection point.
By using calculated data in Table 1 a dimensionless correlation was considered for eddy diffusivity of droplets as follows:
Equation (13) provides an estimated value for eddy diffusivity of droplets for a wide range of operating conditions that usually are used in an industrial Venturi scrubber:
Also, predicted values of eddy diffusivity of droplets by Equation (10) have been compared with values obtained by other correlations too.
For this aim, mostly a two- or three-dimensional dispersion model is considered and it is assumed that the mixing of droplets across the scrubber is the result of the eddy diffusivity of droplets.