Showing papers on "Schmidt number published in 1980"
TL;DR: For condensation from a vapour-gas mixture flowing parallel to a plane horizontal condensing surface and normal to a horizontal tube, approximate theoretically-based equations are obtained relating the mass flux of vapour to the condense surface (condensation rate) to the free-stream and condensate surface conditions as mentioned in this paper.
96 citations
TL;DR: In this paper, the mass transfer enhancement and pressure drop properties of an electrolytic parallel plate cell with a cloth separator in contact with the electrodes have been studied and a surface renewal model of turbulent mass transfer has been used.
26 citations
TL;DR: In this article, the combined effects of buoyancy forces from thermal and mass diffusion in laminar boundary layer adjacent to a continuous, horizontal flat plate moving through an otherwise quiescent fluid are studied analytically by the local nonsimilarity method of solution.
Abstract: The combined effects of buoyancy forces from thermal and mass diffusion in laminar boundary layer adjacent to a continuous, horizontal flat plate moving through an otherwise quiescent fluid are studied analytically by the local nonsimilarity method of solution. In the analysis, the diffusion-thermo and thermo-diffusion effects as well as the interfacial velocities due to mass diffusion are neglected. Numerical results are presented for a Prandtl number of 0.7, with Schmidt numbers of 0.6 and 2.0, for thermal buoyancy parameter Grx/Rex s/2 ranging from 0 to 1.0 and relative buoyancy parameter N = Grx,c/Grx from —0.5 to 2.0. In general, it has been found that the wall shear stress and the surface heat and mass transfer rates increase with increasing thermal buoyancy force. These quantities are further increased when the buoyancy force from mass diffusion assists the thermal buoyancy force, but are decreased when it opposes the thermal buoyancy force. While a Schmidt number of 0.6 is found to yield higher wa...
16 citations
TL;DR: In this article, the effects of mass transfer on free convection flow of an electrically conducting viscous fluid past an impulsively started infinite vertical limiting surface (e.g., of a star) in presence of a transverse magnetic field is considered.
Abstract: The effects of the mass transfer on free convection flow of an electrically conducting viscous fluid (e.g., of a stellar atmosphere) past an impulsively started infinite vertical limiting surface (e.g., of a star) in presence of a transverse magnetic field is considered. Solutions for the velocity and skin-friction, in closed form are obtained with the help of the Laplace transform technique and the results obtained for various values of the parametersSc (Schmidt number),P (Prandtl number) andM (Hartmann number) are given in graphical form. The paper is concluded with a discussion of the results obtained.
9 citations
8 citations
TL;DR: In this paper, the velocity of the moving electrode surface U S and the bulk phase U ∞ have the same direction, i.e., the criterion σ ≡ (U ∞ − U S )/( U ∾ + U S ), where σ ranges from − 1 to +.
5 citations
TL;DR: In this article, a theoretical study of mass transfer in a laminar boundary layer through a mobile interface with high mass flux condition was made, where mass transfer rates were given as function of transfer number B (a dimensionless driving force of the mass transfer to be related to diffusional flow), interfacial velocity parameter us/U∞ and Schmidt number.
Abstract: A theoretical study was made of mass transfer in a laminar boundary layer through a mobile interface with high mass flux condition. The laminar boundary momentum and diffusion equations are solved numerically with Blasius-type similar transformations. The numerical results are obtained for mass transfer rates by taking account of the diffusional flow due to rapid mass transfer and interfacial velocity due to motion of interface simultaneously. Mass transfer rates are given as function of transfer number B (a dimensionless driving force of mass transfer to be related to diffusional flow), interfacial velocity parameter us/U∞ and Schmidt number. The results show that the interfacial velocity increases the mass transfer rates in the case of high mass flux as well as for low mass flux. This effect is very important in the high-Schmidt number region. The previous theories of high mass flux phenomena with fixed interface can be applied to high mass flux mass transfer with mobile interface as long as the effect of the interfacial velocity, in increasing the mass transfer rates, is considered.
4 citations
TL;DR: In this paper, Pe Peclet number defined a s DE r o reactor radius, cm r radial distance, cm R dimensionless radial distance and r/r o Re Reynolds number rou/V Sc Schmidt number v/D u local velocity, cm/sec u bulk average velocity.
Abstract: m order of the first chemical reaction n order of the second chemical reaction uL Pe Peclet number defined a s DE r o reactor radius, cm r radial distance, cm R dimensionless radial distance, r/r o Re Reynolds number rou/V Sc Schmidt number v/D u local velocity, cm/sec u bulk average velocity, cm/sec U dimensionless local velocity u/u C X, Y dimensionless concentrat ions of A and B, C~o J£, f" volume averaged dimensionless concentrat ion of A and B z axial distance, cm Z dimensionless axial distance zD r~u * N C L Communica t ion No 2364
1 citations
01 Jul 1980
01 Jan 1980
TL;DR: In this paper, a mathematical model of fixed-bed and expanded-bed adsorption systems was presented, consisting of two partial differential equations: the mass balance equation and the kinetics equation.
Abstract: A mathematical model of fixed-bed and expanded-bed adsorption systems was presented. The model consists of two partial differential equations: the mass balance equation and the kinetics equation. Fluid dispersion for packed-bed and expanded-bed and solids mixing for expanded-bed were considered. To verify the model adsorption of phenol on granular activated carbon was examined. Model parameters: film transfer coefficient kf and dispersion coefficient DF were estimated. Using molar viscosity coefficient introduced by Kurgaev a satisfactory correlation of mass transfer factor Jd and modyfied Schmidt number Scwith modyfied Reynolds number Rewas established.