Experimental research of the bovine black albumin spray drying processes

The paper shows the results of the experimental research of the spray drying of the bovine black albumin. The physicochemical properties of the dried bovine black albumin were obtained. The granulometric composition and the particle shape structure of the dried product were obtained for the spray drying using the centrifugal sprayer and the pneumatic sprayer for the various solid content range in the source product and the various drying agent initial temperature. The effect of the spraying method, the drying agent initial temperature and the solid content range in the source product on the dried bovine black albumin particle average size was defined. © 2019 Published under licence by IOP Publishing Ltd

The experimental data on the density, viscosity, and boiling temperature of the coffee extract

The paper shows the experimental data on the density, viscosity, and boiling temperature of the coffee extract. The mass fraction of the dry substances varies in the range of 15-70 % for all measurements. The coffee extract temperature varies in the rage of 20-80 °C for the density and viscosity measurements. It is found that the coffee extract density varies in the range of 1030-1350 kg/m3 for the considered cases. The coffee extract viscosity varies in the range of 0.0008-27.4810 Pa•s for the considered cases. The coffee extract boiling temperature varies in the range of 100.0-103.3 °C at atmospheric pressure. It was found that the coffee extract is foaming in the considered range of dry substances mass fraction. The foaming temperature is decreasing with the dry substances mass fraction increasing. © 2020 Published under licence by IOP Publishing Ltd

Investigation of Hydrodynamic Parameters Distribution in Heat Exchange Tubes of Falling Film Evaporator

The purpose of this work is investigation of changes in hydrodynamic parameters (absolute pressure, mass flow rates of solution and secondary steam, secondary steam velocity, solution irrigation density, and pressure loss) along the length of the heat exchange tube of a vertical falling film evaporator. The obtained data of the distribution of hydrodynamic parameters were used in the design of falling film evaporators. © 2021 Author(s)

Investigation of Two-phase Flow Hydrodynamics of Heat Exchange Tube Outlet Falling Film Evaporator

The purpose of this work is investigation the distribution of the gas phase velocity and the liquid phase irrigation density at the outlet of the heat exchange tube of a vertical falling film evaporator. Experimental studies of the hydrodynamics of the two-phase flow at the outlet of the heat exchange tube were carried out on the pilot instalation. Radial distributions of the liquid phase irrigation density at various distances from the lower section of the heating tube are obtained. It is established that high gas phase velocities contribute to turbulization of the two-phase flow in the heat exchange tube and redistribution of part of the liquid phase to the gas flow. © 2021 Author(s)

Investigation of the Hydrodynamics of Mixing Two Technological Media Using a Six-blade Agitator

The precipitation of ammonium polyuranate is carried out in a cascade of reactors, each equipped with a stirrer and a heat exchanger. During this study, a six-blade agitator was considered. The study of mixing hydrodynamics was carried out using CFD simulation. The distribution of two technological media and flow rates in the volume of the reactor was considered at different operating modes of the mixing device. © 2021 Author(s)

Investigation of the Hydrodynamics of Mixing Two Technological Media with a Small-Sized Agitator

The paper shows the results of the two-phase mixing hydrodynamics simulation in the first reactor of the crystallization cascade. The research results were obtained using the ANSYS Fluent CFD code. The distributions of velocity and liquid mixture components volume fractions were obtained. The time of the full averaging of the liquid mixture components volume fractions were obtained. © 2021 Author(s)

Investigation of the Mixing Hydrodynamics of Two-Component Solution with the Three-Blade Agitator

The studies were performed using Ansys Fluent software. The Manninen's multi-phase model and the standard k-epsilon turbulence model were employed for numerical calculations of hydrodynamics; the non-continuous operating mode of a reactor was adopted. A three-blade agitator was used for mixing of the two process media. In the current study, a numerical simulation of the hydrodynamics was carried out under various operating modes of the mixing device. The data on the volume fractions distribution of process media and the speed distribution of flows in the reactor have been obtained and analysed. © Published under licence by IOP Publishing Ltd

Perturbation theory for the one-dimensional optical polaron

The one-dimensional optical polaron is treated on the basis of the perturbation theory in the weak coupling limit. A special matrix diagrammatic technique is developed. It is shown how to evaluate all terms of the perturbation theory for the ground-state energy of a polaron to any order by means of this technique. The ground-state energy is calculated up to the eighth order of the perturbation theory. The effective mass of an electron is obtained up to the sixth order of the perturbation theory. The radius of convergence of the obtained series is estimated. The obtained results are compared with the results from the Feynman polaron theory.Comment: 9 pages, 2 figures, RevTeX, to be published in Phys. Rev. B (2001) Ap