Interaction of moisture with model capillary-porous hydrophilic materials

This paper gives the results of an experimental investigation of the interaction of moisture with model capillary-porous materials and the thermodynamic functions of the water retained by them.     

Effect of pore pressure on the structure formation in heated capillary-porous materials

Analyzed are the conditions of equilibrium and of breakdown in pore walls due to internal pore pressure in moderately heated concrete.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 23, No. 2, pp. 298–303, August, 1972.     

Determination of the moisture content of capillary-porous materials from microwave absorption

The dependence of the damping of microwaves in moist capillary-porous materials on their moisture content is investigated theoretically. Expressions are obtained for the absolute and relative moisture content.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 18, No. 6, pp. 1131–1136, June, 1970.     

Mathematical description of the structure of a capillary-porous body

The properties of a capillary-porous disperse body are described and a mathematical model of its structure is constructed. As the model body, gypsum stone, which hardens under conditions of oriented mass transfer involving the liquid phase, is selected.     

Study of mass transfer in the extraction of moisture from capillary-porous materials

Processes of extraction of water from moist clay minerals by an organic solvent, dioxane, are examined. It is shown that these processes conform to the fundamental laws of mass transfer.     

Intensified heat treatment of colloidal capillary-porous materials

Methods of investigating, improving, and intensifying the clay firing process are examined.     

Kinetics of acoustic drying of capillary-porous materials

Investigations have been made of the drying of quartz sand and specimens of foam polyurethane in an acoustic field. The layerwise distribution of moisture and temperature during elimination of moisture is given.     

Determination of capillary conductance of unsaturated capillary-porous materials

A method of determining the capillary conductance of unsaturated porous materials with a moisture content close to saturation is described, and some results are given.     

Mathematical model of the process of thermal destruction of polymer materials under intense thermal effects

It is proposed to describe heat- and mass-transfer processes in decomposing materials by taking into account both the chemical and physical transformations and the phase transition temperatures.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 53, No. 5, pp. 774–781, November, 1987.     

Determining the macropore structure of capillary-porous materials by various methods

The macropore structure of quartz sand has been studied experimentally by various methods on the basis of various physical phenomena.Translated from Inzhernerno-Fizicheskii Zhurnal, Vol. 23, No. 1, pp. 145–150, July, 1972     

On determining the size distribution of macropores in capillary-porous materials

It is shown by experiment that the trend of the size distribution of macropores in quartz sand or in porous ceramics does not depend on the surface tension in the wetting liquid and on the specimen thickness.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 23, No. 2, pp. 294–297, August, 1972.     

Mathematical model of diffusion in damaged materials

By using basic concepts of the thermodynamics of materials with internal variables (continuously distributed local damages) and taking into account chemical transformations, we deduce a set of nonlinear equations of multicomponent diffusion and propose conditions of mass exchange which reflect the effect of accumulated damages on the processes running on the phase boundaries. Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, L'viv. Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 32, No. 4, pp. 35–38, July–August, 1996.     

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.     

A quick method of measuring the moisture characteristics of capillary-porous materials

A method is described by which the moisture characteristics can be determined on the basis of the hygropotential, using an electrical probe of local moisture contents.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 24, No. 5, pp. 897–901, May, 1973.     

Mathematical model of an automatic pressure setter

Translated from Izmeritel'naya Tekhnika, No. 10, pp. 32–33, October, 1991.     

Control of moisture content in capillary-porous materials by microwave methods

Based on a linear model of a moist capillary-porous material that is located in an electromagnetic microwave field, basic relations between the measured parameters and moisture content been obtained for amplitude and resonator methods. Calculated and experimental dependences of the attenuation of the microwave energy on moisture content and variants of application of moisture meters of the Microradar series are presented. __________ Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 1, pp. 22–26, January–February, 2007.     

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.