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Fluids
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Flow and Heat Transfer Intensification in Chemical Engineering
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Flow and Heat Transfer Intensification in Chemical Engineering

A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Heat and Mass Transfer".

Deadline for manuscript submissions: closed (15 May 2021) | Viewed by 15226

Special Issue Editor

Prof. Dr. Rufat Abiev

E-Mail Website
Guest Editor
Saint Petersburg State Institute of Technology, 26 Moskovsky pr., St. Petersburg 190013, Russia
Interests: multiphase flow; heat and mass transfer; microfluidics; microreactors; microchannel heat pipes; vortex flows; pulsating flows; process intensification

Special Issue Information

Dear Colleagues, 

Process intensification is one of the keystones of progress in Chemical Engineering, leading to smaller, safer, and cleaner technologies of the nearest future (A.I. Stankiewicz, J.A. Moulijn, Chemical Engineering Progress, 2000). Heat transfer intensification in conventional and modern heat exchangers, chemical reactors, microreactors, heat exchange reactors (HEX), monolytic reactors, microchannel heat exchangers, multiphase reactors, and heat pipes is crucially influenced by the flow features, the special geometry of the channels improving heat transfer by secondary flows, vortices and oscillations, and the use of nanofluids. 

This Special Issue of Fluids is dedicated to recent advances in theoretical analysis, experimental observations and/or computational techniques that are contributing to a new and more in-depth understanding of the hydrodynamics basis of heat transfer intensification in chemical eingineering.

Prof. Dr. Rufat Abiev
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fluids is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • heat transfer intensification
  • single-phase and two-phase flows
  • nanofluids for heat transfer
  • two-phase heat pipes
  • secondary flows
  • vortices
  • oscillations
  • heat transfer: simulation
  • heat transfer: experimental
  • heat transfer: theoretical analysis

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Published Papers (4 papers)

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Research

9 pages, 952 KiB  
Article
Diffusion Mechanisms for the Occurrence of the Instability of Mechanical Equilibrium of a Ternary Gas Mixture Containing Carbon Dioxide
by Vladimir Kossov, Olga Fedorenko, Adilet Kalimov and Aiym Zhussanbayeva
Fluids 2021, 6(5), 177; https://doi.org/10.3390/fluids6050177 - 1 May 2021
Cited by 6 | Viewed by 2344
Abstract
Mixing of carbon dioxide dissolved in a multicomponent gas mixture at different pressures was researched. It was found that the mechanical equilibrium of the ternary gas mixture 0.4163H2 (1) + 0.5837CO2 (2) − N2 (3) is violated at a pressure [...] Read more.
Mixing of carbon dioxide dissolved in a multicomponent gas mixture at different pressures was researched. It was found that the mechanical equilibrium of the ternary gas mixture 0.4163H2 (1) + 0.5837CO2 (2) − N2 (3) is violated at a pressure of p = 0.7 MPa and structured flows appear in the system. The pressure area (from 0.7 to 1.5 MPa) at which the conditions of priority transfer of components with the highest molecular weight in the mixture are realised in the system is fixed. To analyse the effect of pressure on the process of changing “diffusion–convection” modes, a mathematical model, which takes into account the kinetic features of multicomponent mixing, was applied. It was shown that the change in the modes of mass transfer is associated with a significant difference in the diffusion ability of the components. It is noted that the difference in the diffusion coefficients of components results in the nonlinearity of the concentration distribution, which leads to the inversion of the density gradient of the gas mixture, which is the cause of convective flows. Full article
(This article belongs to the Special Issue Flow and Heat Transfer Intensification in Chemical Engineering)
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15 pages, 5118 KiB  
Article
Gas–Liquid Two-Phase Flow and Heat Transfer without Phase Change in Microfluidic Heat Exchanger
by Maksim P. Vasilev and Rufat Sh. Abiev
Fluids 2021, 6(4), 150; https://doi.org/10.3390/fluids6040150 - 9 Apr 2021
Cited by 5 | Viewed by 4268
Abstract
This work presents an experimental study of the possibility of intensifying in microfluidic heat exchangers (MFHE) by creating a two-phase segmented flow (gas–liquid). Measurements of convective heat transfer were carried out using an MFHE, consisting of six channels 1 × 1 mm. Experimental [...] Read more.
This work presents an experimental study of the possibility of intensifying in microfluidic heat exchangers (MFHE) by creating a two-phase segmented flow (gas–liquid). Measurements of convective heat transfer were carried out using an MFHE, consisting of six channels 1 × 1 mm. Experimental studies have shown that segmented flow makes it possible to increase the Nusselt number of a laminar flow in MFHE up to 1.67 and reduce thermal resistance up to 1.7 times compared to single-phase flow. At the same time, it was found that the intensification of heat exchange by a two-phase flow is observed only for the range of the volume fraction of gas from 10 to 30%. In addition, the calculation of the thermal performance criterion, including both thermal and hydraulic parameters (friction factor), also confirmed the promise of using the Taylor segmented flow as a method for single-phase heat transfer intensifying in microchannels. Full article
(This article belongs to the Special Issue Flow and Heat Transfer Intensification in Chemical Engineering)
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16 pages, 8028 KiB  
Article
Gas–Liquid Mass Transfer around a Rising Bubble: Combined Effect of Rheology and Surfactant
by Gaelle Lebrun, Feishi Xu, Claude Le Men, Gilles Hébrard and Nicolas Dietrich
Fluids 2021, 6(2), 84; https://doi.org/10.3390/fluids6020084 - 15 Feb 2021
Cited by 16 | Viewed by 4889
Abstract
The influence of viscosity and surface tension on oxygen transfer was investigated using planar laser-induced fluorescence with inhibition (PLIF-I). The surface tension and the viscosity were modified using Triton X-100 and polyacrylamide, respectively. Changes in the hydrodynamic parameters of millimetric bubbles were identified, [...] Read more.
The influence of viscosity and surface tension on oxygen transfer was investigated using planar laser-induced fluorescence with inhibition (PLIF-I). The surface tension and the viscosity were modified using Triton X-100 and polyacrylamide, respectively. Changes in the hydrodynamic parameters of millimetric bubbles were identified, and transfer parameters were calculated. The results revealed a decrease in the mass transferred in the presence of a contaminant. For modified viscosity, the decrease in mass transferred was allowed for by current correlations, but the presence of surfactant led to a sharp decrease in the liquid side mass transfer coefficient, which became even lower when polymer was added. An explanation for the gap between classical correlations and experimental values of kL is discussed, and a hypothesis of the existence of an accumulation of contaminant in the diffusion layer is proposed. This led to the possibility of a decrease in the diffusion coefficient and oxygen saturation concentration in the liquid film, explaining the discrepancy between models and experience. Adapted values of DO2 and [O2] * in this layer were estimated. This original study unravels the complexity of mass transfer from an air bubble in a complex medium. Full article
(This article belongs to the Special Issue Flow and Heat Transfer Intensification in Chemical Engineering)
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10 pages, 3683 KiB  
Article
Mathematical Model for Axisymmetric Taylor Flows Inside a Drop
by Ilya V. Makeev, Rufat Sh. Abiev and Igor Yu. Popov
Fluids 2021, 6(1), 7; https://doi.org/10.3390/fluids6010007 - 26 Dec 2020
Viewed by 2761
Abstract
Analytical solutions of the Stokes equations written as a differential equation for the Stokes stream function were obtained. These solutions describe three-dimensional axisymmetric flows of a viscous liquid inside a drop that has the shape of a spheroid of rotation and have a [...] Read more.
Analytical solutions of the Stokes equations written as a differential equation for the Stokes stream function were obtained. These solutions describe three-dimensional axisymmetric flows of a viscous liquid inside a drop that has the shape of a spheroid of rotation and have a similar set of characteristics with Taylor flows inside bubbles that occur during the transfer of a two-component mixture through tubes. Full article
(This article belongs to the Special Issue Flow and Heat Transfer Intensification in Chemical Engineering)
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