The study of a consistent pattern of heat and mass transfer at drying fiber-forming polymers

In this article, the consistent pattern of mass transfer in the process of drying granular polyethylene terephthalate (PET), polycaproamide (PCA), and polyamide 66 (PA 66) were studied. A modified quasi-stationary method was used to analyze the data. The characteristic time and the hydrodynamic intensity index were obtained based on experimental data. Some features of water sorption and desorption by fiber-forming polymers were studied.

The Study of Heat and Mass-Exchange Processes during the Drying of Granulate of Hydrophobic Polymers

In this article, the drying characteristics were studied for granules of hydrophobic polymers, in particular, poly (ethylene terephthalate). To analyze the data, the modified quasi-stationary method was used. A modified quasi-stationary method has been proposed to describe drying kinetics of particulate materials dried in convective dryers with active hydrodynamic regimes. Parameters of reduced time and hydrodynamic intensity index were obtained for the generalized drying curve. Equations with refined parameters can be used to calculate the drying time and determine the temporal change in moisture content and material temperature.

On the temperature and pressure dependences of the effective thermal conductivity of granites

The results of experimental measurements of the temperature dependence of the effective thermal conductivity of various granite samples obtained by the absolute stationary method in the temperature and pressure ranges of 273- 523 K and 0.1-400 MPa, respectively, are analyzed. The power-law character of the temperature dependence of the effective thermal conductivity for all measured granite samples at atmospheric pressure is established. We have shown that pressure significantly affects the power law of the temperature dependence of the effective thermal conductivity of granite samples. A low-parameter description of the temperature-pressure behavior of thermal conductivity is proposed. A correlation is established between its components.

Technique of measuring the emissivity coefficient of solid materials surface

The option of non-stationary method of measuring the emissivity coefficient of solid materials surface is presented. Results of a model calculating experiment are given.