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JournalISSN: 0040-5795

Theoretical Foundations of Chemical Engineering 

Springer Science+Business Media
About: Theoretical Foundations of Chemical Engineering is an academic journal published by Springer Science+Business Media. The journal publishes majorly in the area(s): Mass transfer & Distillation. It has an ISSN identifier of 0040-5795. Over the lifetime, 2832 publications have been published receiving 13204 citations.


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Journal ArticleDOI
TL;DR: A survey of the present-day methods of dehydration of ethanol resulting from fermentation processes is given in this article, where the existing separation techniques for water-ethanol mixtures of various compositions are compared, and the conditions under which each particular technique is preferable are formulated.
Abstract: This article is a survey of the present-day methods of dehydration of ethanol resulting from fermentation processes. The existing separation techniques for water-ethanol mixtures of various compositions are compared, and the conditions under which each particular technique is preferable are formulated.

113 citations

Journal ArticleDOI
TL;DR: In this article, an analysis of published data on a gas-liquid two-phase flow in capillaries of various shapes is given, which makes it possible to systematize the collected body of information.
Abstract: Capillary hydrodynamics has three considerable distinctions from macrosystems: first, there is an increase in the ratio of the surface area of the phases to the volume that they occupy; second, a flow is characterized by small Reynolds numbers at which viscous forces predominate over inertial forces; and third, the microroughness and wettability of the wall of the channel exert a considerable influence on the flow pattern. In view of these differences, the correlations used for tubes with a larger diameter cannot be used to calculate the boundaries of the transitions between different flow regimes in microchannels. In the present review, an analysis of published data on a gas-liquid two-phase flow in capillaries of various shapes is given, which makes it possible to systematize the collected body of information. The specific features of the geometry of a mixer and an inlet section, the hydraulic diameter of a capillary, and the surface tension of a liquid exert the strongest influence on the position of the boundaries of two-phase flow regimes. Under conditions of the constant geometry of the mixer, the best agreement in the position of the boundaries of the transitions between different hydrodynamic regimes in capillaries is observed during the construction of maps of the regimes with the use of the Weber numbers for a gas and a liquid as coordinate axes.

100 citations

Journal ArticleDOI
TL;DR: In this article, the place occupied by nanofibers in the classification of carbon materials is shown, and an analysis is made of the relationship between the structure of a fiber and its useful properties, in particular, the strength and tensile modulus.
Abstract: Carbon nanofibers are described as a new ultrahigh-strength material, which is superior to both ordinary carbon fibers and other high-strength materials. The place occupied by nanofibers in the classification of carbon materials is shown, and an analysis is made of the relationship between the structure of a fiber and its useful properties, in particular, the strength and tensile modulus. Studies on the synthesis of nanofibers are reviewed. It is shown that the practically important problem of producing nanofibers of maximum possible length must be solved by controlling the temperature conditions of the reaction. The prospects for introducing nanofibers into the market of high-strength and heat-resistant materials are analyzed. The most likely prospect seems to be the partial replacement of polyacrylonitrile-based fibers by nanofibers, first and foremost, in the fields where the requirements for high strength are particularly stringent due to safety reasons.

99 citations

Journal ArticleDOI
TL;DR: In this article, a wide class of two-dimensional and three-dimensional steady-state and non-steady-state flows of a viscous incompressible fluid is considered, where the components of the velocity of a fluid linearly depend on two spatial coordinates.
Abstract: A wide class of two-dimensional and three-dimensional steady-state and non-steady-state flows of a viscous incompressible fluid is considered. It is assumed that the components of the velocity of a fluid linearly depend on two spatial coordinates. The three-dimensional Navier-Stokes equations in this case are reduced to a closed determining system that consists of six equations with partial derivatives of the third and second orders. A brief review of the known exact solutions of this system and the respective flows of a fluid (Couette-Poiseuille, Ekman, Stokes, Karman, and other flows) is given. The cases of reducing a determining system to one or two equations are described. Many new exact solutions of two-dimensional and three-dimensional nonstationary Navier-Stokes equations containing arbitrary functions and arbitrary parameters are derived. Periodic (both in spatial coordinates and in time) and some other solutions that are expressed in terms of elementary functions are described. The problems of the nonlinear stability of solutions are studied. A number of new hydrodynamic problems are considered. A general interpretation of the solutions as the main terms of the Taylor series expansion in terms of radial coordinates is given.

87 citations

Journal ArticleDOI
TL;DR: The most important theoretical formulas for small Reynolds numbers of Re ≪ 1 and semi-empirical formulas for the drag coefficient in a wide Re range up to 106 are presented in this paper.
Abstract: This article, which is largely a review, deals with the drag force and drag coefficient for rigid spherical and deformable particles in ordinary and non-Newtonian fluids. The most important theoretical formulas for small Reynolds numbers of Re ≪ 1 and semiempirical formulas for the drag coefficient in a wide Re range up to 106 are presented. The deformation of drops and bubbles and its effect on the drag coefficient are considered.

87 citations

Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
202346
2022275
202189
2020155
2019130
2018133