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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "K: State-of-the-Art Energy Related Technologies".

Deadline for manuscript submissions: closed (30 May 2023) | Viewed by 7601

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Special Issue Editors

Prof. Dr. Jianzhong Lin

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Department of Mechanics, Zhejiang University, Hangzhou 310027, China
Interests: multiphase flow; microfluidics; fluid machinery
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Dr. Qiang Zhou

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Guest Editor

School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi'an 710049, China
Interests: gas-solid flows; fluidization; meso-scale science

Dr. Zhenjiang You

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Guest Editor

School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
Interests: transport phenomena in porous media; enhanced oil and gas recovery; underground gas storage; multiphase flow
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Fubing Bao

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Institution Fluid Measurement & Simulation, China Jiliang University, Hangzhou 310027, China
Interests: multiphase flow; micro/nano flow; flow measurement

Prof. Dr. Kun Zhou

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Guest Editor

Department of Energy & Power Engineering, Wuhan University of Science and Technology, Wuhan 430065, China
Interests: fluid dynamics; numerical simulation

Special Issue Information

Dear Colleagues,

Multiphase flows are found throughout the energy and chemical sectors. They play a significant role in the production, transport, and storage of energy. Their behaviours are also critical to many energy-related chemical processes, such as coal gasification, biomass pyrolysis, fluid catalytic cracking, and so forth. Multiphase flows are also common and are of practical significance; they can be found in processes, such as the production of oil and polymerization reaction engineering. In the industrial design of many relative facilities and reactors, as well as the accurate prediction of mass, momentum and energy exchange in multiphase flows remain a severe challenge due to the nonlinear interactions between phases and the complicated flow structures. Therefore, intense research is underway to offer a more nuanced understanding around the underlying mechanism of various multiphase flows.

This Special Issue aims to invite researchers and engineers from academia and industry to publish their latest achievements associated with multiphase flows. A fairly wide scope of research papers is planned that may cover experimental as well as numerical investigations. We encourage the development of numerical algorisms, measuring methods, and also unprecedented applications.

Topics of interest for publication include, but are not limited to:

modeling of multiphase flow;
numerical simulation method of multiphase flow;
experimental method of multiphase flow;
measurement technology of multiphase flow;
testing instrument of multiphase flow;
mass, momentum, and energy exchange in multiphase flow;
resistance characteristics of multiphase flow and drag reduction;
turbulence suppression and control of multiphase flow;
heat transfer enhancement of multiphase flow;
optimal design of multiphase flow process;
driving efficiency and energy consumption of self-driven particles in multiphase flow.

Prof. Dr. Jianzhong Lin
Prof. Dr. Qiang Zhou
Dr. Zhenjiang You
Prof. Dr. Fubing Bao
Prof. Dr. Kun Zhou
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

multiphase flow
fluidization
nanofluid
dispersed flow
droplets and particles
particulate flow
granular flow
turbulent flow
particle interaction
phase transition
numerical simulation
experiment
drag coefficient
heat transfer
energy conservation

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Published Papers (4 papers)

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Research

12 pages, 3561 KiB

Open AccessArticle

Determination of Critical Point of Particle Migration Direction in a Confined Shear Flow of Giesekus Fluids

by Zhenna Li, Bingrui Liu and Jianzhong Lin

Energies 2023, 16(7), 3263; https://doi.org/10.3390/en16073263 - 5 Apr 2023

Viewed by 1187

Abstract

Migration of a particle in a confined shear flow of Giesekus fluids is investigated numerically with the method of direct forcing/fictitious domain. We focus on the migration direction for the particle with initial lateral position y₀ and determination of critical point y_c of a particle moving towards the center line or wall. The effect of viscosity ratio μ_r, shear-thinning parameter α, Weissenberg number Wi, and blocking rate β on the value y_c is analyzed. The results showed that when μ_r ≤ 0.5, the particle will migrate towards the wall regardless of the value of y₀. When μ_r > 0.5, y_c increases with increasing μ_r, and some particles will migrate towards the center line with the increase in μ_r. The particle is more likely to migrate towards the center line at small values of Wi and α but at large values of μ_r. The impact of Wi and β on the particle migration direction is more obvious. The particle will migrate towards the wall for β = 0.3 and is more likely to migrate towards the wall with increasing β. α and Wi have little influence on the pressure distribution in the case of the same β and μ_r. The particle near the wall will migrate faster because large positive pressure and negative pressure appear around the particle. Full article

(This article belongs to the Special Issue Multiphase Flows Related to Energies)

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16 pages, 10046 KiB

Open AccessArticle

A Computational Fluid Dynamics Study of Laminar Forced Convection Improvement of a Non-Newtonian Hybrid Nanofluid within an Annular Pipe in Porous Media

by Hesam Moghadasi, Mohamad Bayat, Ehsan Aminian, Jesper H. Hattel and Mahdi Bodaghi

Energies 2022, 15(21), 8207; https://doi.org/10.3390/en15218207 - 3 Nov 2022

Cited by 5 | Viewed by 2503

Abstract

Porous inserts and nanofluids are among the conventional methods for the amelioration of heat transfer in industrial systems. The heat transfer rate could also be improved by utilizing porous substances with a higher thermal conductivity in these systems. This research work presents a [...] Read more.

A l_{2} O_{3}

C u O

-carboxy methyl cellulose (CMC) non-Newtonian hybrid nanofluid within an annular pipe in a porous medium. The porous medium was inserted within two inner or outer wall cases. For hybrid nanofluid flow modeling in porous media, a Darcy–Brinkman–Forchheimer formulation was employed. Additionally, a power-law technique was utilized as a fluid viscosity model for the considered non-Newtonian fluid. The governing equations were discretized according to the finite volume method (FVM) using the computational fluid dynamics (CFD) software package ANSYS-FLUENT. The cylinder walls’ thermal boundary conditions were exposed to a constant heat flux. For various Darcy numbers, the impacts of different volume fractions of the hybrid nanofluid (0% to 5%), the total Nusselt number, the pressure drop, and the performance number (PN) were evaluated. The outcomes indicate that the heat transfer coefficient increases considerably with a decrease in the Darcy number (

0.1

0.0001

), as well as with an increase in the porous thickness ratio. Moreover, it was found that the nanoparticles’ increased volume fraction would ameliorate the heat transfer and, more considerably, the PN factor. Furthermore, according to the outcomes in both cases I and II for a constant porous thickness ratio and Darcy number

(r_{p} = 1, D a = 0.0001)

and a high volume fraction (

φ = 5 %

), the maximum total Nusselt number reached 1274.44. Moreover, applying a volume fraction of 5% with

D a = 0.1

and

r_{p} = 1

reached the highest value of the PN index equal to 7.61, which is augmented as roughly 88% compared to the case of a zero volume fraction. Full article

(This article belongs to the Special Issue Multiphase Flows Related to Energies)

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12 pages, 4378 KiB

Open AccessArticle

Interchangeability of Hydrogen Injection in Zhejiang Natural Gas Pipelines as a Means to Achieve Carbon Neutrality

by Sirui Tong, Xiang Li, Shien Sun, Chengxu Tu and Xufeng Xia

Energies 2022, 15(17), 6394; https://doi.org/10.3390/en15176394 - 1 Sep 2022

Cited by 6 | Viewed by 1837

Abstract

The blending of hydrogen gas into natural gas pipelines is an effective way of achieving the goal of carbon neutrality. Due to the large differences in the calorific values of natural gas from different sources, the calorific value of natural gas after mixing with hydrogen may not meet the quality requirements of natural gas, and the quality of natural gas entering long-distance natural gas and urban gas pipelines also has different requirements. Therefore, it is necessary to study the effect of multiple gas sources and different pipe network types on the differences in the calorific values of natural gas following hydrogen admixing. In this regard, this study aimed to determine the quality requirements and proportions of hydrogen-mixed gas in natural gas pipelines at home and abroad, and systematically determined the quality requirements for natural gas entering both long-distance natural gas and urban gas pipelines in combination with national standards. Taking the real calorific values of the gas supply cycle of seven atmospheric sources as an example, the calorific and Wobbe Index values for different hydrogen admixture ratios in a one-year cycle were calculated. The results showed that under the requirement of natural gas interchangeability, there were great differences in the proportions of natural gas mixed with hydrogen from different gas sources. When determining the proportion of hydrogen mixed with natural gas, both the factors of different gas sources and the factors of the gas supply cycle should be considered. Full article

(This article belongs to the Special Issue Multiphase Flows Related to Energies)

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16 pages, 4104 KiB

Open AccessArticle

Friction Factor and Heat Transfer of Giesekus-Fluid-Based Nanofluids in a Pipe Flow

by Wenqian Lin, Hailin Yang and Jianzhong Lin

Energies 2022, 15(9), 3234; https://doi.org/10.3390/en15093234 - 28 Apr 2022

Viewed by 1325

Abstract

The friction factor and heat transfer of Giesekus-fluid-based nanofluids in a pipe flow were studied in the ranges of 0.5 ≤ Reynolds number (Re) ≤ 500, 1 ≤ Weissenberg number (Wi) ≤ 8, 0.5% ≤ particle volume concentration (Φ) ≤ 3.0%, 0 ≤ viscosity ratio (β₀) ≤ 1, and 0 ≤ mobility parameter (α) ≤ 0.5. Our numerical method was validated by comparing the results with available ones in the literature. The effects of Wi, Φ, β₀, Re, and α on the relative friction factor (C_f/C_f_New), Nusselt number (Nu), and ratio (PEC_nf/PEC_f) of energy performance evaluation criterion for Giesekus-fluid-based nanofluids to those for Giesekus fluid were discussed. The results showed that the values for the C_f/C_f_New and Nu of Giesekus-fluid-based nanofluids were larger than those for Newtonian fluid-based nanofluids and those for pure Giesekus fluid. The values for C_f/C_f_New increased with increasing Φ and Re, but they increased with decreasing β₀ and α. As Wi increased, the values of C_f/C_f_New first increased and then decreased. The values of Nu and PEC_nf/PEC_f were enhanced with increasing Wi, Φ, Re, and α, but with decreasing β₀. It is more effective to use Giesekus-fluid-based nanofluids to improve heat transfer with the conditions of a larger Wi, Φ, Re, and α and a smaller β₀. Finally, the correlation formula for PEC_nf/PEC_f as a function of Wi, Φ, β₀, Re, and α was derived. Full article

(This article belongs to the Special Issue Multiphase Flows Related to Energies)

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