mixing length

mixing length

[′mik·siŋ ‚leŋkth]
(physics)
A mean length of travel, characteristic of a particular motion, over which an eddy maintains its identity; it is analogous to the mean free path of a molecule; physically, the idea implies that mixing occurs by discontinuous steps, that fluctuations which arise as eddies with different characteristics wander about, and that the mixing is done almost entirely by the small eddies.
References in periodicals archive ?
From experimental observations of radial mixing in a pipe, a mixing length of 50 to 100 pipe diameters is required for homogeneous mixing to occur naturally [12].
According to the Boussinesq eddy viscosity assumption (Boussinesq, 1877), the logarithmic law for velocity profile was solved by using the mixing length method (Prandtl, 1925; Khan et al., 2017; Zawar et al., 2017).
As the 3D components of the MARS code are used, the coefficient for the turbulent mixing length model must be specified as a user input.
The most convenient parameter for the comparison with the experiment is the mixing length in the present case because it is possible to assess the accuracy of simulation by one single parameter.
radar network and compared them statistically to storm structures in the Met Office model, which they ran at horizontal grid length between 1.5 km and 100 m, including simulations with different subgrid mixing length. The authors also evaluated the scale and intensity of convective updrafts using a new radar technique.
Namely, the error in mixing length prediction is of the order of 1~2%.The fitting formula is written as
To gain some understanding of the phenomena taking place in the mixing zone in T-junctions, numerical investigations have been carried out to determine the thermal mixing length. The simulations were done using steady 3D approach and the turbulent fluid motion was solved with RANS: k-[epsilon] standard, k-[omega] standard, k-[omega] SST and RSM models.
The initial turbulence intensity was set at 5% of the mean flow, and the integral length scale was estimated with the mixing length model of Prandtl.
The Cobras could well be without their cleverest fast bowler - in terms of mixing length, line and pace - Charl Langveldt, after he injured himself diving in the field against Bangalore.
Both first order and TKE based closures are based on the concept of a mixing length, l, and require the computation of an eddy diffusivity, K, which in the latter schemes is a function of a prognostic TKE.
Because the available reactor volume is slightly different when different elements are used (Table 2), the downstream volumes were defined in terms of the corresponding additional mixing length [lambda], the length of the section downstream of the probe that is part of the apparent volume over which the mean residence time is measured.
More versatile than Farrel's original continuous mixer, the unit features extra mixing length and residence time and what the supplier terms a vastly expanded processing window.