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Advances in Fluid Flow Dynamics and Heat Transfer
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Advances in Fluid Flow Dynamics and Heat Transfer

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J1: Heat and Mass Transfer".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 9025

Special Issue Editors

Dr. Jingzhi Zhang

E-Mail Website
Guest Editor
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Interests: boiling; condensation; heat transfer; microchannel; numerical simulation
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Gongming Xin

E-Mail Website
Guest Editor
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Interests: heat transfer; heat pipes; thermal management; fluid flow; microchannel
Prof. Dr. Xinyu Wang

E-Mail Website
Guest Editor
Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Interests: nanoscale heat conduction; micro/nanoscale flow and heat transfer; thermal management; first-principles calculations; molecular dynamics simulation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Fluid Flow Dynamics and heat transfer of single phase and multiphase flows are always encountered in the energy utilization fields, such as power plants, air conditionings, renewable energy utilization, thermal management, et al. In recent years, many new fundamental studies have been conducted experimentally and numerically in this field. Some new insight of heat transfer mechanism and new methods to enhance heat transfer of single phase and multiphase flows have been discovered. This special issue expects to provide a platform in the area of flow and heat transfer in single phase and multiphase flows. The scope of the special issue includes all aspects of theoretical, numerical, and experimental investigations of fluid flow dynamics and heat transfer.

In this Special Issue on " Advances in Fluid Flow Dynamics and Heat Transfer”, we welcome review articles and original research papers, fundamental or applied, theoretical, numerical, or experimental investigations on fluid flow dynamics and heat transfer phenomenon.

Dr. Jingzhi Zhang
Prof. Dr. Gongming Xin
Prof. Dr. Xinyu Wang
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

  • electrical equipment cooling
  • thermal mangement
  • heat sinks
  • heat exchangers
  • heat pipes
  • heat transfer enhacement
  • mini/micro channels
  • multiphase flows
  • boiling
  • condensation
  • microfluidics
  • droplets
  • numerical simulations
  • md simulation
  • flow patterns
  • pressure drops
  • supercritical fluid
  • phase change material
  • heat storage

Published Papers (5 papers)

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Research

14 pages, 5275 KiB  
Article
Numerical and Experimental Analysis of Shell and Tube Heat Exchanger with Round and Hexagonal Tubes
by Abdullah Khan, Imran Shah, Waheed Gul, Tariq Amin Khan, Yasir Ali and Syed Athar Masood
Energies 2023, 16(2), 880; https://doi.org/10.3390/en16020880 - 12 Jan 2023
Cited by 4 | Viewed by 3503
Abstract
Shell and tube heat exchangers are used to transfer thermal energy from one medium to another for regulating fluid temperatures in the processing and pasteurizing industries. Enhancement of a heat transfer rate is desired to maximize the energy efficiency of the shell and [...] Read more.
Shell and tube heat exchangers are used to transfer thermal energy from one medium to another for regulating fluid temperatures in the processing and pasteurizing industries. Enhancement of a heat transfer rate is desired to maximize the energy efficiency of the shell and tube heat exchangers. In this research work, we performed computational fluid dynamics (CFD) simulations and experimental analysis on the shell and tube heat exchangers using round and hexagonal tubes for a range of flow velocities using both parallel flow and counter flow arrangements. In the present work, the rate of heat transfer, temperature drop, and heat transfer coefficient are computed using three turbulence models: the Spalart–Allmaras, the k-epsilon (RNG), and the k-omega shear stress transport (SST). We further utilized the logarithmic mean temperature difference (LMTD) method to compute the heat transfer and mass flow rates for both parallel and counter flow arrangements. Our results show that the rate of heat transfer is increased by introducing the hexagonal structure tubes, since it has better flow disruption as compared to the round tubes. We further validated our simulation results with experiments. For more accurate results, CFD is performed in counter and parallel flow and it is deduced that the rate of heat transfer directly depends upon the velocity of fluids and the number of turns of the tube. Full article
(This article belongs to the Special Issue Advances in Fluid Flow Dynamics and Heat Transfer)
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14 pages, 3371 KiB  
Article
A Modified Calculation Method for a Centered Water Nozzle Steam–Water Injector
by Hanbing Ke, Qi Xiao, Chengyi Long, Jialun Liu, Leitai Shi and Linghong Tang
Energies 2022, 15(23), 9159; https://doi.org/10.3390/en15239159 - 2 Dec 2022
Viewed by 982
Abstract
A centered water nozzle steam–water injector is driven by cold water to pump steam at a low pressure and to produce a high outlet water pressure. It can be used as a safety pump in a light water reactor to inject cooling water [...] Read more.
A centered water nozzle steam–water injector is driven by cold water to pump steam at a low pressure and to produce a high outlet water pressure. It can be used as a safety pump in a light water reactor to inject cooling water into the reactor core with no power supply in case of an accident. In this study, a modified calculation method for a centered water nozzle steam–water injector is proposed and verified by experimental data in the literature. The calculation method consists of a water nozzle model, a steam nozzle model, a mixing section model, and a shock wave model. Comparisons between the calculated results and the experimental results under different inlet steam pressures, inlet water pressures, and back pressures are conducted, and the calculated results show good agreement with the experimental results. The calculated results with different back pressures show that no shock wave occurs in the mixing section when the back pressure is small, but with the back pressure increasing, the pressure undergoes a dramatic increase in the throat tube, and the shock wave position moves towards the inlet of the mixing section. Due to the complexity of shock wave characteristics, it is necessary to conduct a more in-depth study of shock wave characteristics in the mixing section to determine more detailed boundary conditions for shock wave generation. Full article
(This article belongs to the Special Issue Advances in Fluid Flow Dynamics and Heat Transfer)
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18 pages, 4255 KiB  
Article
Influences of Liquid Viscosity and Relative Velocity on the Head-On Collisions of Immiscible Drops
by Jiaqing Chang, Rongchang Xu, Jinsheng Cui, Qiaolin Song and Teng Shen
Energies 2022, 15(22), 8544; https://doi.org/10.3390/en15228544 - 15 Nov 2022
Cited by 1 | Viewed by 1181
Abstract
Many researchers have devoted themselves to the collision processes of binary droplets of the same liquid. However, the liquids used in their study were limited, and the phase diagram of the collision outcome was depicted in terms of the Weber and the non-dimensional [...] Read more.
Many researchers have devoted themselves to the collision processes of binary droplets of the same liquid. However, the liquids used in their study were limited, and the phase diagram of the collision outcome was depicted in terms of the Weber and the non-dimensional impact parameter. In this research, the variety of liquid was broadened, and the phase diagram characterized by the Weber number and the Ohnesorge number for head-on collisions of immiscible drops was provided. First, a ternary flow model of binary collision of immiscible drops in quiescent ambient air was proposed. Second, the three-phase fluid interface was tracked and updated by iterating the VOF (Volume of Fluid) functions. The flow field was also updated with the PISO (Pressure-Implicit with Splitting of Operators) algorithm. Finally, the effects of the impact velocity and the viscosities of the liquids on the deformation degree of droplets were analyzed. Full article
(This article belongs to the Special Issue Advances in Fluid Flow Dynamics and Heat Transfer)
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13 pages, 4187 KiB  
Article
Experimental Study on Heat Transfer Characteristics of Two-Phase Flow in Square and Rectangular Channels
by Jingzhi Zhang, Bo Zhang, Li Lei, Cheng Cheng, Jinjin Xu and Naixiang Zhou
Energies 2022, 15(22), 8453; https://doi.org/10.3390/en15228453 - 12 Nov 2022
Cited by 2 | Viewed by 1384
Abstract
Two-phase flow in non-circular cross-section flow channels such as micro-heat sinks and micro-channel heat exchangers has received extensive attention due to its heat-enhancing properties. In this paper, under the boundary of constant heat flux, an experimental investigation of the heat transfer properties of [...] Read more.
Two-phase flow in non-circular cross-section flow channels such as micro-heat sinks and micro-channel heat exchangers has received extensive attention due to its heat-enhancing properties. In this paper, under the boundary of constant heat flux, an experimental investigation of the heat transfer properties of gas–liquid two-phase flow in horizontal channels with cross-sections of 4 × 4 mm and 8 × 3 mm is carried out using air and water as working fluids. The effects of different inlet gas and liquid inlet Reynolds numbers on the wall temperature and Nusselt number are discussed. The results show that the effects of the liquid Reynolds number and the gas phase Reynolds number on the heat transfer coefficient of the square tube and the rectangular tube are different. Under the same gas–liquid Reynolds number, the Nusselt number of the gas–liquid two-phase flow in the square-section tube can be increased by 3.2 times compared with that in the single-phase flow, while the Nusselt number of the gas–liquid two-phase flow in the rectangular tubes can be increased by 1.87 times. The results of this paper provide a reference for the design of microchannel heat exchangers and the establishment of mathematical models for Taylor flow heat transfer in rectangular and square tubes. Full article
(This article belongs to the Special Issue Advances in Fluid Flow Dynamics and Heat Transfer)
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19 pages, 7778 KiB  
Article
Dynamic Characteristics of Transverse-Magnetic-Field Induced Arc for Plasma-Jet-Triggered Protective Gas Switch in Hybrid UHVDC System
by Wen Wang, Zhibing Li, Keli Gao, Enyuan Dong, Xuebin Qu and Xiaodong Xu
Energies 2022, 15(16), 5871; https://doi.org/10.3390/en15165871 - 13 Aug 2022
Cited by 1 | Viewed by 1341
Abstract
A plasma jet-triggered gas switch (PJT-GS) has been developed as an important piece of equipment to operate in an ±800 kV ultra-high voltage direct current transmission system (UHV DC) to achieve grid system protection and control. The crucial factors that would affect [...] Read more.
A plasma jet-triggered gas switch (PJT-GS) has been developed as an important piece of equipment to operate in an ±800 kV ultra-high voltage direct current transmission system (UHV DC) to achieve grid system protection and control. The crucial factors that would affect its operational performance, such as the current level the PJT-GS could withstand and the gas gap distance between the two rotating electrodes, are comparatively studied in the present work by analysing the arc dynamic characteristics. The rotating electrode used in the PJT-GS is designed with a helical-slotted structure, and the arc can be rotated circularly driven by the produced transverse magnetic field (TMF) along the electrode edge. The objective of such research is to provide a thorough study of the arc dynamic behaviour during the current flowing process of the PJT-GS and also to characterise the physical mechanism that affects the arc rotation and the PJT-GS operation performance. The magnetohydrodynamic-based (MHD) approach is applied by establishing a 3D arc model. Following such a study, the variation of arc characteristics under different operation conditions could be thoroughly determined and it also could provide the guidance for the PJT-GS optimum design reasonably to support its corresponding engineering applications. Full article
(This article belongs to the Special Issue Advances in Fluid Flow Dynamics and Heat Transfer)
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