An analytic study of the internal mass transfer during vacuum-sublimation drying

An equation for the drying rate during the ice sublimation stage of the process is derived on the basis of the molecular-kinetic theory of gases, with the vapor (gas) permeability of materials of various structures taken into account.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 23, No. 5, pp. 868–870, November, 1972.     

Heat and mass transfer in drying of ground paste-like materials in a compact layer

The paper formulates and solves the problems of heat and mass transfer in a compact layer of disperse material for the case of a drying agent supplied through the material with constant and fluctuating schedules of convective drying.     

Mechanism of mass transfer affecting liquid metals in sintered composite materials

It is demonstrated that mass transfer of the liquid phase in sintered composite materials can occur as a result of restructurization of the refractory skeleton.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 37, No. 6, pp. 977–980, December, 1979.     

Calculation of parameters of internal heat and mass transfer during drying of fiber material

Using arguments and characteristic functions of the thermodynamics of irreversible processes, calculations are made of parameters of internal heat and mass transfer during drying of fiber material in melted paraffin.     

Contact heat transfer and external mass transfer in contact drying

The heat transfer, compounded by a phase transformation, between the heater surface and the adjoining dried material is considered here as well as the mass transfer between the free surface of this material and surrounding medium (air or cloth) during the first stage and the second stage of the drying process.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 19, No. 3, pp. 482–490, September, 1970.     

Investigation of heat and mass transfer in jet drying

The results are given of a combined experimental investigation of the aerodynamics and heat and mass transfer for various nozzle systems. The influence of the system parameters on the drying process is established. Criterial relations are obtained for calculating heat and mass transfer in the jet drying of paper and cardboard.     

Mass transfer in the process of drying of porous materials

The mass transfer in the process of drying of deformable porous bodies was theoretically investigated and the corresponding mass-transfer equation was analytically solved. On the basis of experimental data on the drying of porous materials, the ill-posed inverse problem on determination of the region of regular change in the effective diffusion coefficient and in the porosity of a porous-material layer with time was solved.     

Determination of coefficient of external mass transfer in drying processes

A method is proposed for determining the coefficient of external mass transfer from experimental curves of drying kinetics in porous materials. A comparison of results obtained by this method and by the method of moisture content measurements indicates a close agreement.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 42, No. 4, pp. 599–603, April, 1982.     

Nonsteady heat and mass transfer in drying by reduced pressure

The article examines nonsteady heat and mass transfer in the process of drying by reduced pressure, on the assumption that the moisture is situated on the surface of an infinite plate.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 45, No. 2, pp. 272–275, August, 1983.     

The transfer of heat and mass in capillary-porous materials in the hygroscopic state on drying by means of reduction in pressure

A mathematical model has been developed for the process of removing multicomponent moisture from disperse capillary-porous materials during the second drying period.Translated from Inzhenerno-Fizicheskii] Zhurnal, Vol. 56, No. 2, pp. 276–281, February, 1989.     

Modeling of heat and mass transfer in capillary-porous materials

A system of differential equations for heat and mass transfer in capillary-porous materials in a hydroscopic moisture-content field is derived with allowance for kinetics of moisture desorption, two-phase filtration, and liquid pressure determined by the action of surface forces. An analysis is made of the results of a computational experiment illustrating evolution of the moisture content, temperature, and vapor pressure fields against the material characteristics and kinetic coefficient. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 71, No. 2, pp. 225–232, March–April, 1998.     

Mechanism of internal heat and mass transfer in gels of high-molecular-weight compounds by the use of radioactive tracers

Radioactive tracers have been used to study the mechanisms of internal heat and mass transfer and shrinkage, and phase composition of the transferred liquid in the process of drying of gels of high-molecular-weight compounds.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 52, No. 4, pp. 638–641, April, 1987.     

Optimum control of processes of heat and mass transfer during drying

The problem of the optimum control of processes of conjugate heat and mass transfer during drying is solved for the case when the controlling parameter is the temperature of the drying agent and the quality criterion is the heat expenditure.Translated from Inzhenerno-Fizicheskii, Vol. 32, No. 2, pp. 309–315, February, 1977.     

Analytic investigation of heat and mass transfer under varied drying conditions

Formulas are obtained for heat and mass flows at the boundary of the semispace during the second drying period with the temperature and mass-transfer potential remaining constant at that boundary.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 30, No. 6, pp. 1075–1080, June, 1976.     

Enhancement of the internal mass transfer under isothermal conditions

A study has been made concerning the effect of an electric and a magnetic field as well as the effect of exchange ions on the internal mass transfer in the case of moisture sorption in grade KSM-5 silica gel in a constant-temperature and constant-pressure atmosphere of water vapor.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 2, pp. 309–315, August, 1973.     

An investigation of mass transfer in a spherical capillary-porous body under drying conditions

This paper gives the results of an experimental investigation of moisture transport in a capillary-porous solid subject to convective drying.     

Turbulent mass transfer and diffusion in polymer solutions reducing friction drag

A comparison is presented between the computed and experimental data on turbulent mass transfer and diffusion in the near-wall domain of a channel and plate.Translated from Inzhernerno-Fizicheskii Zhurnal, Vol. 54, No. 6, pp. 963–970, June, 1988.     

Mechanism of photo induced mass transfer in amorphous chalcogenide films

Surface relief gratings produced on a surface of amorphous chalcogenide films As₂₀Se₈₀ are flatten at room temperature under illumination by a near-bandgap polarized light (λ = 650 nm). The rates of the profiles flattening are dependent on the light intensity, polarization direction, and grating period. Two possible flattening mechanisms are selected: viscous flow and volume diffusion, and the flattening rates are calculated for both of them. From the comparison of the theory with the experiments, it is concluded that the process is controlled by anisotropic volume diffusion. The effective photo-induced diffusion coefficients, D_xx, along E-vector of the light polarization, obtained from the flattening kinetics are proportional to the light intensity (D_xx = β_xI) with β_x = 2.5 × 10^− 18 m⁴/J. The diffusion coefficients D_yy along perpendicular direction are four times smaller, independently of the light intensity.