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Energies
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Fluid Mechanics and Thermodynamics: Theory, Methods and Applications
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Fluid Mechanics and Thermodynamics: Theory, Methods and Applications

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

Deadline for manuscript submissions: closed (20 July 2019) | Viewed by 22195

Special Issue Editor

Prof. Dr. Václav Tesař

E-Mail Website
Guest Editor
Institute of Thermomechanics, Czech Academy of Sciences, 18200 Prague, Czech Republic
Interests: fluid mechanics; shear flows; wall jets; no-moving-part fluidics and microfluidics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Papers collected for this Special Issue aim at understanding problems of fluid mechanics nature associated with recent approaches to increasing the efficiency of heat transfer and thermal energy storage in fluids.

In particular, the interest is focused on papers presenting new ideas, such as the application of fluidic devices, especially no-moving-part fluidic oscillators which can achieve a considerable intensification of the transfer processes without the addition of external energy, on the basis of the flow oscillation they generate. Other approaches for the intensification of heat transfer and storage in fluids, especially those generally less known, will also be of interest.

Prof. Václav Tesař
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. 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

  • Heat transfer
  • transfer processes
  • intensification of processes
  • energy storage
  • flow control
  • oscillation in flows
  • no-moving-part fluidics
  • new approaches to combustion
  • energy from biological objects

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Published Papers (6 papers)

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Research

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13 pages, 3587 KiB  
Article
Aerodynamics of Monolithic Matrices for Supporting Solid Reactant or Catalyst
by Václav Tesař
Energies 2019, 12(17), 3398; https://doi.org/10.3390/en12173398 - 3 Sep 2019
Cited by 1 | Viewed by 2359
Abstract
Heterogeneous solid/fluid chemical reactions—as well as reactions dependent on solid catalysts—require spreading the active solid substance on the largest accessible area. The solution is a thin layer covering as much as possible convoluted surface of an inert support. This is nowadays the internal [...] Read more.
Heterogeneous solid/fluid chemical reactions—as well as reactions dependent on solid catalysts—require spreading the active solid substance on the largest accessible area. The solution is a thin layer covering as much as possible convoluted surface of an inert support. This is nowadays the internal surface of narrow parallel passages. The supporting body is usually ceramic, its passages now mostly of square cross section. Reliable detailed knowledge of pressure drop across the set of passages has to be available, especially for flow control based on fluid property changes (e.g., with temperature or fluid composition). This paper presents results of laboratory measurements as well as numerical flowfield computations of the passage flows, with discovered universal law. Full article
(This article belongs to the Special Issue Fluid Mechanics and Thermodynamics: Theory, Methods and Applications)
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14 pages, 3428 KiB  
Article
Delay by Spin-Up of Captive Vortex
by Václav Tesař
Energies 2019, 12(17), 3341; https://doi.org/10.3390/en12173341 - 29 Aug 2019
Cited by 1 | Viewed by 2613
Abstract
Recent application of fluidics show increasing importance with respect to signals encoded in flow pulses, in oscillators as well as in closely related devices for correcting the distorted pulse shapes. The parameters of the pulses are adjusted using the output of the fluidic [...] Read more.
Recent application of fluidics show increasing importance with respect to signals encoded in flow pulses, in oscillators as well as in closely related devices for correcting the distorted pulse shapes. The parameters of the pulses are adjusted using the output of the fluidic circuits generating the time delays. Currently they are mostly based on the speed of the flow propagation channels. This paper focuses on a much less known delay principle, based on the dynamics of spin-up of a vortex rotating inside a closed cavity and shows some simple fluidic circuits using this principle. Apart from an experimentally investigated model, the manuscript also contains a simple theory for the captive vortex dynamics. Full article
(This article belongs to the Special Issue Fluid Mechanics and Thermodynamics: Theory, Methods and Applications)
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18 pages, 5400 KiB  
Article
Active Fluidic Turn-Down Rectifier
by Václav Tesař
Energies 2019, 12(16), 3181; https://doi.org/10.3390/en12163181 - 19 Aug 2019
Cited by 1 | Viewed by 3183
Abstract
Paper discusses a device belonging into an interesting and yet little-known family of no-moving-part active fluidic rectifiers. The generated steady component of flow and pressure are driven by input alternating flow from an external source. The absence of moving components results in the [...] Read more.
Paper discusses a device belonging into an interesting and yet little-known family of no-moving-part active fluidic rectifiers. The generated steady component of flow and pressure are driven by input alternating flow from an external source. The absence of moving components results in the unique capability of unlimited life and reliability, especially useful for safety devices. In the experiment, the rectifier generated a pressure keeping dangerous liquid in the active zone. When the driving oscillation stops (like, e.g., due to coolant loss), the liquid leaves the zone under gravity, stopping the performed reaction. This safety facility is simple, inexpensive, and extremely reliable. Full article
(This article belongs to the Special Issue Fluid Mechanics and Thermodynamics: Theory, Methods and Applications)
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20 pages, 735 KiB  
Article
Influence of Inclined Magnetic Field on Carreau Nanoliquid Thin Film Flow and Heat Transfer with Graphene Nanoparticles
by Noor Saeed Khan, Taza Gul, Poom Kumam, Zahir Shah, Saeed Islam, Waris Khan, Samina Zuhra and Arif Sohail
Energies 2019, 12(8), 1459; https://doi.org/10.3390/en12081459 - 17 Apr 2019
Cited by 58 | Viewed by 4876
Abstract
The thermodynamics of a Carreau nanoliquid thin film embedded with graphene nanoparticles past a stretching sheet is studied in the presence of inclined magnetic field and non-uniform heat source/sink. Graphene is a new two-dimensional amphiphilic macromolecule which has great applications due to its [...] Read more.
The thermodynamics of a Carreau nanoliquid thin film embedded with graphene nanoparticles past a stretching sheet is studied in the presence of inclined magnetic field and non-uniform heat source/sink. Graphene is a new two-dimensional amphiphilic macromolecule which has great applications due to its electrical and mechanical properties. The basic constitutive equations of Carreau nanoliquid for velocity and temperature have been used. Similarity transformations are adopted to achieve the nonlinear coupled differential equations accompanying boundary conditions embedded with different parameters. HAM (Homotopy Analysis Method) is used to solve the transformed equations for expressions of velocity and temperature. Graphs are shown which illustrate the effects of various parameters of interest. There exists a nice agreement between the present and published results. The results are useful for the thermal conductivity and in the analysis and design of coating processes. Full article
(This article belongs to the Special Issue Fluid Mechanics and Thermodynamics: Theory, Methods and Applications)
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15 pages, 10952 KiB  
Article
Decaying Swirl Flow and Particle Behavior through the Hole Cleaning Device for Horizontal Drilling of Fossil Fuel
by Jingyu Qu, Tie Yan, Xiaofeng Sun, Zijian Li and Wei Li
Energies 2019, 12(3), 336; https://doi.org/10.3390/en12030336 - 22 Jan 2019
Cited by 7 | Viewed by 3090
Abstract
The hole cleaning device is a powerful application which can effectively slow down the deposition of cuttings during drilling. However, in this complicated swirl flow created by the device, the decay of the swirl flow and the particle behavior are not evident yet. [...] Read more.
The hole cleaning device is a powerful application which can effectively slow down the deposition of cuttings during drilling. However, in this complicated swirl flow created by the device, the decay of the swirl flow and the particle behavior are not evident yet. In this paper, the decay of the swirl flow and the particle behavior in the swirl flow field are studied by the Eulerian–Eulerian two-fluid model (TFM) coupled with the kinetic theory of granular flows (KTGF), and sliding mesh (SM) technique for simulating the fluid flow. The results show that the swirl intensity decays exponentially along the flow direction under laminar flow conditions. The swirl flow has a longer acting distance at a higher rotational speed, which can effectively slow down the deposition of cutting particles. The initial swirl intensity of swirl flow induced by the blades increases significantly with the increase of blade height and the decrease of the blade angle. The tangential velocity of the cutting particles in the annulus is more significant near the central region, gradually decreases toward the wall in the radial direction, and rapidly decreases to 0 at the wall surface. The decay rate is negatively correlated with the initial swirl intensity. The results presented here may provide a useful reference for the design of the hole cleaning device. Full article
(This article belongs to the Special Issue Fluid Mechanics and Thermodynamics: Theory, Methods and Applications)
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Review

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21 pages, 5922 KiB  
Review
Time-Delay Circuits for Fluidic Oscillators and Pulse Shapers
by Václav Tesař
Energies 2019, 12(16), 3071; https://doi.org/10.3390/en12163071 - 9 Aug 2019
Cited by 2 | Viewed by 4920
Abstract
Fluidic signals transferred between mutually communicating components of fluidic circuits are nowadays still often in the format of continuously varied value of pressure or flow rate. Especially when transported over longer distances, these simple signals may easily deteriorate due to varying properties they [...] Read more.
Fluidic signals transferred between mutually communicating components of fluidic circuits are nowadays still often in the format of continuously varied value of pressure or flow rate. Especially when transported over longer distances, these simple signals may easily deteriorate due to varying properties they meet in the transmission. An example are friction losses dependent on local temperature. A solution to this signal corruption problem is to encode the signals into flow pulses. Their parameters (such as the number of pulses in a delivered pulse cluster) much less deteriorating during transfer are derived from the time delays generated in delay circuits and oscillators. This paper surveys the basic physical aspects of the fluidic pulse generation and shaping, also presents some examples of circuit design. Full article
(This article belongs to the Special Issue Fluid Mechanics and Thermodynamics: Theory, Methods and Applications)
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