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Inventions
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Fluid Mechanics and Transport Phenomena
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Fluid Mechanics and Transport Phenomena

A special issue of Inventions (ISSN 2411-5134). This special issue belongs to the section "Inventions and Innovation in Energy and Thermal/Fluidic Science".

Deadline for manuscript submissions: closed (31 March 2021) | Viewed by 13512

Special Issue Editors

Prof. Dr. Shyy Woei Chang

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Guest Editor
Department of System and Naval Mechatronic Engineering, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan
Interests: heat transfer enhancement; gas turbine blade cooling; electronic cooling; thermosyphon and heat pipe; heat convection of reciprocating and pulsating flows; cooling of electric motor
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Pey-Shey Wu

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Guest Editor
Department of Mechanical and Automation Engineering, Da-Yeh University, No. 168, University Road, Dacun Changhua 51591, Taiwan
Interests: heat transfer experiments; CFD

Special Issue Information

Dear Colleagues,

Fluid mechanics and transport phenomena play a crucial role in energy conversion and management, with wide applications such as in fluid machineries, chemical processes, heat exchangers, energy transmission, biomechanical engineering, agricultural engineering, cooling of electric and electronic devices, buildings, and renewable energy systems. This Special Issue is dedicated to current advancements in theoretical, experimental, and numerical studies of single and multiphase flows, which are of significance for the science of industrial and environmental applications. Papers addressing the latest developments in computational fluid dynamics (CFD) and experimental methods for investigating fluid flows involving transport phenomena are also of interest.

Prof. Shyy Woei Chang
Prof. Dr. Pey-Shey Wu
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. Inventions 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 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

  • fluid machinery
  • convective flow
  • hydrodynamics of single/multiphase flows
  • energy conversion
  • energy system
  • heat exchanger
  • vital component cooling

Published Papers (3 papers)

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Research

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22 pages, 4555 KiB  
Article
Influence of Dimple Height on Turbulent Heat Transfer of Fin Array with Alternate Convex/Concave Dimples
by Horng-Wen Wu, Tang-Hong Chen, Nugroho-Putra Kelana and De-An Huang
Inventions 2020, 5(3), 33; https://doi.org/10.3390/inventions5030033 - 18 Jul 2020
Cited by 5 | Viewed by 3667
Abstract
This study analyzes transient turbulent modeling of three-dimensional multiple dimpled fin array using large eddy simulation (LES). The Navier–Stokes equations as well as the energy equation were constructed by the finite volume method and then discretized to form algebraic equations, which were solved [...] Read more.
This study analyzes transient turbulent modeling of three-dimensional multiple dimpled fin array using large eddy simulation (LES). The Navier–Stokes equations as well as the energy equation were constructed by the finite volume method and then discretized to form algebraic equations, which were solved by semi-implicit method for pressure-linked equation (SIMPLE). The solutions of temperature and velocity were obtained by iterating computation until it converged within each step. This simulation places nine fins on the bottom surface of a channel and changes the height of the dimple (0.4, 0.8, and 1.2 mm) with three different levels of Reynolds number (Re) (3500, 5000, and 6500) to investigate the temperature and flow field without gravity in forced convection. The results indicate that the dimpled fin array can generate vortices between the convex/concave dimples and the fin base and increase the influences of the height of the dimple on the flow field around the fin array. The averaged time-mean of the Nusselt number (Nu) for the dimple height of 0.8 mm is higher than that of the no-dimple case up to 14.4%, while the averaged time-mean Nu for the dimple height of 1.2 mm is lower than that of the no-dimple case up to 11.6%. Full article
(This article belongs to the Special Issue Fluid Mechanics and Transport Phenomena)
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16 pages, 5937 KiB  
Article
Experimental Performance of a Two-Phase Ejector: Nozzle Geometry and Subcooling Effects
by Khaled Ameur, Zine Aidoun and Mehdi Falsafioon
Inventions 2020, 5(2), 23; https://doi.org/10.3390/inventions5020023 - 18 Jun 2020
Cited by 4 | Viewed by 4239
Abstract
This paper presents the results of an experimental study on a two-phase ejector. The main objective is to assess the effects of the nozzle’s divergent and the throat diameter on performance under various working conditions. Under the same conditions, ejector operation with a [...] Read more.
This paper presents the results of an experimental study on a two-phase ejector. The main objective is to assess the effects of the nozzle’s divergent and the throat diameter on performance under various working conditions. Under the same conditions, ejector operation with a convergent nozzle, results in higher critical primary mass flow rate and lower critical pressure than with a convergent-divergent nozzle version. Experiments show as well that the flow expansion is higher in the convergent-divergent nozzle. The throat diameter turns out to have an important impact only on the amount of the critical mass flow rate. The nozzle geometry has no impact on its optimal position in the ejector. Globally, the ejector with the convergent-divergent nozzle provides a higher entrainment ratio, due to a reduced primary mass flow rate and an increased secondary flow induction. Tests also show that the ejector with a lower throat diameter provides a higher entrainment ratio, due to better suction with less primary flow. Unlike the convergent-divergent nozzle, the convergent nozzle permits an entrainment ratio almost insensitive to a wide range of primary inlet sub-cooling levels. Primary and secondary mass flow rates increase proportionally with the subcooling level and result in a quasi-constant entrainment ratio. Full article
(This article belongs to the Special Issue Fluid Mechanics and Transport Phenomena)
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Review

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18 pages, 3657 KiB  
Review
Modelling of Boiling Flows for Nuclear Thermal Hydraulics Applications—A Brief Review
by Giovanni Giustini
Inventions 2020, 5(3), 47; https://doi.org/10.3390/inventions5030047 - 14 Sep 2020
Cited by 12 | Viewed by 4126
Abstract
The boiling process is utterly fundamental to the design and safety of water-cooled fission reactors. Both boiling water reactors and pressurised water reactors use boiling under high-pressure subcooled liquid flow conditions to achieve high surface heat fluxes required for their operation. Liquid water [...] Read more.
The boiling process is utterly fundamental to the design and safety of water-cooled fission reactors. Both boiling water reactors and pressurised water reactors use boiling under high-pressure subcooled liquid flow conditions to achieve high surface heat fluxes required for their operation. Liquid water is an excellent coolant, which is why water-cooled reactors can have such small sizes and high-power densities, yet also have relatively low component temperatures. Steam is in contrast a very poor coolant. A good understanding of how liquid water coolant turns into steam is correspondingly vital. This need is particularly pressing because heat transfer by water when it is only partially steam (‘nucleate boiling’ regime) is particularly effective, providing a great incentive to operate a plant in this regime. Computational modelling of boiling, using computational fluid dynamics (CFD) simulation at the ‘component scale’ typical of nuclear subchannel analysis and at the scale of the single bubbles, is a core activity of current nuclear thermal hydraulics research. This paper gives an overview of recent literature on computational modelling of boiling. The knowledge and capabilities embodied in the surveyed literature entail theoretical, experimental and modelling work, and enabled the scientific community to improve its current understanding of the fundamental heat transfer phenomena in boiling fluids and to develop more accurate tools for the prediction of two-phase cooling in nuclear systems. Data and insights gathered on the fundamental heat transfer processes associated with the behaviour of single bubbles enabled us to develop and apply more capable modelling tools for engineering simulation and to obtain reliable estimates of the heat transfer rates associated with the growth and departure of steam bubbles from heated surfaces. While results so far are promising, much work is still needed in terms of development of fundamental understanding of the physical processes and application of improved modelling capabilities to industrially relevant flows. Full article
(This article belongs to the Special Issue Fluid Mechanics and Transport Phenomena)
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