Showing papers on "Schmidt number published in 1981"
TL;DR: In this paper, a plane turbulent mixing between two streams of water which contained dilute chemical reactants was studied in a new blow-down water tunnel and a transition in the mixing was observed in which the aqueous mixing product increased by an order of magnitude.
Abstract: Plane turbulent mixing between two streams of water which contained dilute chemical reactants was studied in a new blow-down water tunnel. In a diffusion-limited reaction, a pH indicator, phenolphthalein, in one stream mixed and reacted with a base, sodium hydroxide, in the other stream to form a visible reaction product. The product was found to exist, as expected, in concentrated regions associated with the large, span-wise-coherent structures of the turbulence. A transition in the mixing was observed in which the aqueous mixing product increased by an order of magnitude. The transition is a consequence of the appearance and development of small-scale three-dimensional motions in the flow. Downstream of the transition, the amount of mixing product was independent of Reynolds number (for an order-of-magnitude increase in the latter) and at most only weakly dependent on Schmidt number.
384 citations
TL;DR: In this paper, implicit finite-difference analysis of transient free convective flow past a semi-infinite vertical flat plate, on taking into account mass transfer, is carried out.
119 citations
TL;DR: In this article, the authors considered two-dimensional unsteady free convection and mass transfer, flow of an incompressible viscous dissipative and electrically conducting fluid past an infinite, vertical porous plate, when the flow, is subjected in the action of uniform transverse magnetic field.
Abstract: Two-dimensional unsteady free convection and mass transfer, flow of an incompressible viscous dissipative and electrically conducting fluid, past an infinite, vertical porous plate, is considered, when the flow, is subjected in the action of uniform transverse magnetic field. The magnetic Reynolds number is taken to be small enough so that the induced magnetic field is negligible. The solution of the problem is obtained in the form of power series of Eckert numberE, which is very small for incompressible fluids. Analytical expressions for the velocity field and temperature field are given, as well as for the skin friction and the rate of heat transfer for the case of the mean steady flow and for the unsteady one. The influence of the magnetic parameter,M, modified Grashof numberG c , Schmidt numberS c and frequency ω, on the flow field, is discussed with the help of graphs, when the plate is being cooled, by the free convection currents (G r ,E>0), or heated (G r ,E<0). A comparative study with hydrodynamic case (M=0) and the hydromagnetic one (M≠0) is also made whenever necessary.
34 citations
TL;DR: Elghobashi et al. as discussed by the authors measured and predicted heat, mass, and momentum transport in a confined axisymmetric turbulent nonreacting flow of a jet in an opposing stream.
Abstract: Author(s): Elghobashi, SE; Samuelsen, GS; Wuerer, JE; LaRue, JC | Abstract: The paper addresses the measurement and prediction of heat, mass, and momentum transport in a confined axisymmetric turbulent nonreacting flow of a jet in an opposing stream. The predictions are obtained by solving numerically the conservation equations of the mean flow and the transport equations of the kinetic energy of turbulence and its dissipation rate and the mean square temperature fluctuations. The predicted velocity field is in agreement with the experiment, but the predicted scalar fields point to the need of examining the employed model of a scalar turbulent diffusion. © 1981 by ASME.
11 citations
01 Jan 1981
10 citations
TL;DR: An analysis of the mass transfer in a unsteady two-dimensional flow past an accelerated infinite vertical plate has been carried out under the following conditions: (1) the heat-transfer is varied at the plate (2) the non-dimensional timet is small and (3) Prandtl and Schmidt number is equal to one as mentioned in this paper.
Abstract: An analysis of the mass transfer in a unsteady two-dimensional flow past an accelerated infinite vertical plate has been carried out under the following conditions: (1) The heat-transfer is varied at the plate (2) the non-dimensional timet is small and (3) Prandtl and Schmidt number is equal to one
9 citations
TL;DR: The effect of the Schmidt number on the overall mass transfer from a solid sphere has been investigated by use of the electrochemical method, in non turbulent flow as mentioned in this paper, and the maximum increase of the transfer rate due to crossflow support has been found to be about 8 per cent.
2 citations