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Numerical, Theoretical and Experimental Investigation of Two-Phase Flow

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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (27 March 2023) | Viewed by 7695

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Special Issue Editors

Dr. Mostafa Safdari Shadloo

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Guest Editor

CORIA Lab., INSA Rouen/ CNRS (UMR 6614), Rouen, France
Interests: turbulence; computational fluid dynamics (CFD); multiphase flows; meshless methods; high performance computing (HPC)
Special Issues, Collections and Topics in MDPI journals

Dr. Omid Mahian

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Guest Editor

School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China
Interests: solar energy systems; entropy generation and exergy analysis in energy systems; heat transfer in nanofluids; solar stills
Special Issues, Collections and Topics in MDPI journals

Dr. Manuel Hopp-Hirschler

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Guest Editor

Institute of Chemical Process Engineering, University of Stuttgart, 70049 Stuttgart, Germany
Interests: upscaling; porous media; theoretical physics; membranes; experimental approaches

Special Issue Information

Dear Colleagues,

The permanent challenges facing renewable power units demand innovative solutions. Several open issues between the nano and unit scale need to be investigated theoretically, numerically, and experimentally for further impact in climatic change. Since different physical, chemical, biological, and electrical mechanisms may be involved, interdisciplinary approaches are essential to develop novel solutions. A key process is two-phase flow in power systems. This Special Issue aims to collect recent advances in the numerical, theoretical, and experimental investigation of two-phase flows connected to power systems. We invite contributions including, but not limited to, the following topics:

Numerical methods and computational advances;
Simulation and modeling approaches;
Theoretical investigations of two-phase flows;
Coarse-graining and upscaling approaches and their application;
Experimental approaches, results, and analyses;
Thermodynamics and fluid properties in a two-phase system;
Advances in the engineering design of two-phase processes;
Heat and mass transfer in two-phase systems (condensation, boiling, solidification, etc.);
Multiphysics approaches and investigations.

Dr. Mostafa Safdari Shadloo
Dr. Omid Mahian
Dr. Manuel Hopp-Hirschler
Guest Editors

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. Energies is an international peer-reviewed open access semimonthly 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 2600 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

Turbulence
Computational fluid dynamics (CFD)
Multiphase flows
Numerical methods, meshless methods
High-performance computing (HPC)
Engineering design
Constructal law
Mass and heat transfer
Optimization
Upscaling
Porous media, membranes
Theoretical physics
Experimental approaches
Uncertainty measurements in experiments

Published Papers (4 papers)

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Research

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22 pages, 6056 KiB

Open AccessArticle

Experimental and Prenemilary Numerical Evaluation of Pressure Drops under the Conditions of the Stratified Gas-Liquid Flow in a Horizontal Pipe Filled with Metal Foam

by Jerzy Hapanowicz, Adriana Szydłowska and Jacek Wydrych

Energies 2022, 15(23), 9068; https://0-doi-org.brum.beds.ac.uk/10.3390/en15239068 - 30 Nov 2022

Viewed by 1454

Abstract

The paper reports the results of experimental tests and numerical simulations related to the pressure drop during two-phase air-water mixture flow through a pipe containing metal foam packing. Aluminium foam with 40 PPI open cells was used in the tests. A horizontal pipe with an internal diameter of 10 mm was used, and the foam only occupied a section of the pipe length equal to 240 mm. In the section of the pipe upwards of the foam, stratified flow pattern was generated, i.e., the most characteristic type for the gas-liquid flow. The results of the experimental research were compared with the values derived on the basis of the empirical method, which was developed for several different metal foams and two-phase systems. The values derived from measurements and calculations were subsequently applied to validate one numerical simulation method that is known to be particularly applicable for two-phase gas-liquid flow through metal foams. As a final result, the phenomena resulting from the presence of foam in the stratified flow through a gas-liquid system, the deficiencies of the methods applied in calculating pressure drops and modeling their values in accordance with the adopted numerical procedure were indicated. All research and modelling were carried out with the purpose of testing the potential of metal foam use in pipes dedicated to heat exchanger design, particularly ones intended to improve energy efficiency. Full article

(This article belongs to the Special Issue Numerical, Theoretical and Experimental Investigation of Two-Phase Flow)

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20 pages, 2137 KiB

Open AccessArticle

A Numerical Investigation of the Energy Efficiency Enhancement of Oscillating Water Column Wave Energy Converter Systems

by Shayan Ramezanzadeh, Murat Ozbulut and Mehmet Yildiz

Energies 2022, 15(21), 8276; https://0-doi-org.brum.beds.ac.uk/10.3390/en15218276 - 05 Nov 2022

Cited by 6 | Viewed by 1214

Abstract

This work focuses on the geometry effects over the performance of oscillating water column (OWC)-type wave energy converter (WEC) systems and searches for the OWC geometries that enhance the energy efficiencies under the same wave conditions. To analyze the hydrodynamic performances of the WEC systems, an in-house smoothed particle hydrodynamics (SPH) code based on weakly compressible fluid approach is utilized. The energy efficiency enhancement studies of the determined OWC device are carried out with a two-step geometry modification procedure. The first step starts with the validation of the free-surface elevation and orbital velocity time histories. Then, a three-by-three simulation matrix that depends on the geometrical design parameters of chamber length and front wall draft is run at three different wave conditions, and the OWC geometry that produces the maximum energy efficiency is determined. In the second step, the corner regions of the obtained optimal geometry are chamfered, and another simulation matrix is tested at the wave condition that yields maximum wave energy. It is observed in this step that the energy efficiency index can still be improved by 4.3% by only chamfering the back face of the OWC chamber. To scrutinize the physical grounds of this increase, the correlation between the time-averaged vorticity and energy efficiency is presented. Finally, the performance of the best configuration is also examined in three different wave periods, where the suggested geometry shows better performance with respect to base geometry results in all wave conditions. Full article

(This article belongs to the Special Issue Numerical, Theoretical and Experimental Investigation of Two-Phase Flow)

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21 pages, 2965 KiB

Open AccessArticle

Coupled Electrohydrodynamic and Thermocapillary Instability of Multi-Phase Flows Using an Incompressible Smoothed Particle Hydrodynamics Method

by Fatemeh Almasi, Manuel Hopp-Hirschler, Abdellah Hadjadj, Ulrich Nieken and Mostafa Safdari Shadloo

Energies 2022, 15(7), 2576; https://0-doi-org.brum.beds.ac.uk/10.3390/en15072576 - 01 Apr 2022

Cited by 3 | Viewed by 1818

Abstract

This paper concerns the study of coupled effects of electrohydrodynamic (EHD) and thermocapillary (TC) on the dynamic behaviour of a single liquid droplet. An incompressible Smoothed Particle Hydrodynamic (ISPH) multiphase model is used to simulate EHD-TC driven flows. The complex hydrodynamic interactions are modeled using the continuum surface force (CSF) method, in which the gradient of the interfacial tension and the Marangoni forces are calculated with an approximated error or 0.014% in the calculation of Marangoni force compared to the analytical solutions which is a significant improvement in comparison with previous SPH simulation studies, under the assumption that the thermocapillarity generates sufficiently large stress to allow droplet migration, while the electrohydrodynamic phenomena influences the droplet morphology depending on the electrical and thermal ratios of the droplet and the ambient fluid. This study shows that, when applying a vertical electric field and thermal gradient, the droplet starts to stretch horizontally towards a break-up condition at a high rate of electrical permitivity. The combined effect of thermal gradient and electric field tends to push further the droplet towards the break-up regime. When the thermal gradient and the electric field vector are orthogonal, results show that the droplet deformation would take place more slowly and the Marangoni forces cause the droplet to migrate, while the stretching in the direction of the electric field is not seen to be as strong as in the first case. Full article

(This article belongs to the Special Issue Numerical, Theoretical and Experimental Investigation of Two-Phase Flow)

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Review

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25 pages, 5320 KiB

Open AccessReview

A Review on Heat Transfer Enhancement of Phase Change Materials Using Fin Tubes

by Fei Ma, Tianji Zhu, Yalin Zhang, Xinli Lu, Wei Zhang and Feng Ma

Energies 2023, 16(1), 545; https://0-doi-org.brum.beds.ac.uk/10.3390/en16010545 - 03 Jan 2023

Cited by 9 | Viewed by 2437

Abstract

Latent heat thermal energy storage (LHTES) has received more and more attention in the thermal energy storage field due to the large heat storage density and nearly constant temperature during phase change process. However, the low thermal conductivity of phase change material (PCM) leads to poor performance of the LHTES system. In this paper, the research about heat transfer enhancement of PCM using fin tubes is summarized. Different kinds of fins, such as rectangular fin, annular fin, spiral fin, etc., are discussed and compared based on the shape of the fins. It is found that the longitudinal rectangular fins have excellent heat transfer performance and are easy to manufacture. The effect of fins on heat transfer enhancement is closely related to the number of fins and its geometric parameters. Full article

(This article belongs to the Special Issue Numerical, Theoretical and Experimental Investigation of Two-Phase Flow)

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