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Applied Sciences
Special Issues
Novel Research on Heat Transfer and Thermodynamics
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Novel Research on Heat Transfer and Thermodynamics

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Applied Thermal Engineering".

Deadline for manuscript submissions: 10 August 2024 | Viewed by 2747

Special Issue Editor

Prof. Dr. Fernando Zenaido Sierra-Espinosa

E-Mail Website
Guest Editor
Center for Research and Engineering, CIICAp, State Autonomous University of Morelos, Cuernavaca 62209, México
Interests: turbulence measurement and modelling; conjugate heat transfer; film cooling; swirl combustion; energy harvesting

Special Issue Information

Dear Colleagues,

This is a kind invitation for you to submit an article in the fields of heat transfer and thermodynamics. Recent advances allow many aspects of the effects of properties, conditions, and various applications. However, more research is necessary to improve the thermal performance of processes and devices. This Special Issue seeks to publish all contributions with a deep insight into solving technological problems and applications. Also, looking to mitigate the consequences of climate change, this Special Issue looks for friendly solutions involving heat and thermodynamics.

I hope you will consider submitting your work to this Special Issue of the Journal of Applied Sciences.

Prof. Dr. Fernando Zenaido Sierra-Espinosa
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. Applied Sciences 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 2400 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

  • convective heat transfer coefficient
  • film cooling
  • thermal boundary layer
  • Nusselt number
  • Reynolds number
  • natural–forced convection
  • turbulence
  • thermal comfort
  • thermal conjugate CFD solution
  • ORC
  • thermo-economic evaluation
  • failure analysis
  • solar-assisted system
  • heat transfer rate
  • Rayleigh number
  • nanofluid
  • thermal boundary layer

Published Papers (3 papers)

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Research

20 pages, 3818 KiB  
Article
The Effect of a New Approach to Cooling the External Heat Exchange Surfaces of a Car Cooler with Air Nozzles on the Cooling Process
by Marek Lipnický and Zuzana Brodnianská
Appl. Sci. 2024, 14(6), 2227; https://doi.org/10.3390/app14062227 - 07 Mar 2024
Viewed by 417
Abstract
The paper deals with an experimental investigation of a new approach for cooling the external heat exchange surfaces of a cooler using an air pressure nozzle system. The G12+ coolant (50:50 ethylene glycol/water concentrate) is heated to an operating temperature of 80 °C [...] Read more.
The paper deals with an experimental investigation of a new approach for cooling the external heat exchange surfaces of a cooler using an air pressure nozzle system. The G12+ coolant (50:50 ethylene glycol/water concentrate) is heated to an operating temperature of 80 °C and cooled by a cooler. Three ways of forced cooling of the external heat exchange surfaces of the cooler are experimentally compared—fan, nozzles, and a combination of nozzles and fan. The spacing between the nozzles and the cooler is variable from 60 to 170 mm in inline and staggered nozzle arrangements. Coolant temperatures in the cooler inlet and outlet pipes are recorded by thermistors. The air pressure nozzle system achieved an improvement in the cooling process compared to a conventional fan. At a spacing of 160 mm, the heat exchange surface is completely covered by the air flow, which leads to a reduction in cooling time and an increase in the temperature difference. The maximum temperature difference of 28.84 °C and 16.90 °C for staggered arrangement of nozzles at a spacing of 160 mm are achieved for the combination of nozzles with fan and nozzles, respectively. When comparing 60 mm and 160 mm spacing, there was an increase in thermal performance of 70.3%, 55.99%, 6.20%, and 1.83% for inline nozzles, staggered nozzles, fan with inline nozzles, and fan with staggered nozzles, respectively. The air nozzle system fully replaces the fan in the cooling process and achieves improved heat dissipation, making the cooling process significantly shorter and more efficient. In addition, the air nozzle system can also be used as an additional equipment for intensification of heat dissipation in combination with the fan. Full article
(This article belongs to the Special Issue Novel Research on Heat Transfer and Thermodynamics)
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19 pages, 6856 KiB  
Article
Modelling a Loop Heat Pipe as Heat Switch for Transient Application in Space Systems
by João P. Castanheira, Nicole G. Dias, Rui Melicio, Paulo Gordo, André R. R. Silva and Roger M. Pereira
Appl. Sci. 2023, 13(23), 12547; https://doi.org/10.3390/app132312547 - 21 Nov 2023
Viewed by 789
Abstract
Heat switches are devices for controlling heat flow in various applications, such as electronic devices, cryogenic cooling systems, spacecraft, and rockets. These devices require non-linear transient thermal simulations, in which there is a lack of information. In this study, we introduce an innovative [...] Read more.
Heat switches are devices for controlling heat flow in various applications, such as electronic devices, cryogenic cooling systems, spacecraft, and rockets. These devices require non-linear transient thermal simulations, in which there is a lack of information. In this study, we introduce an innovative 1D thermo-hydraulic lumped parameter model to simulate loop heat pipes as heat switches by regulating the temperature difference between the evaporator and the compensation chamber. The developed thermo-hydraulic model uses the continuity, energy, and momentum equations to represent the behaviour of loop heat pipes as heat switches. The model also highlights the importance of some thermal conductance parameters and correction coefficients for accurately simulating the different operational states of a loop heat pipe. The simulations are conducted using the proposed 1D model, solved through the application of the Mathcad block function. The numerical model presented is successfully validated by comparing the temperatures of the evaporator and condenser inlet nodes with those of a referenced loop heat pipe from the literature. In conclusion, in this research, the mathematical modelling of loop heat pipes as heat switches is presented. This is achieved by incorporating correction coefficients with Boolean logic that results in non-linear transient simulations. The presented 1D thermo-hydraulic lumped parameter model serves as a valuable tool for thermal system design, particularly for systems with non-linear operational modes like sorption compressors. The graphical and nodal representation of this proposed 1D thermo-hydraulic model further enhances its utility in understanding and optimising loop heat pipes as heat switches across various thermal management scenarios. Full article
(This article belongs to the Special Issue Novel Research on Heat Transfer and Thermodynamics)
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14 pages, 1719 KiB  
Article
Tyre–Road Heat Transfer Coefficient Equation Proposal
by Paolo Cattani, Lucia Cattani and Anna Magrini
Appl. Sci. 2023, 13(21), 11996; https://doi.org/10.3390/app132111996 - 03 Nov 2023
Viewed by 1165
Abstract
Tyres are one of the most important elements of a vehicle because they are the link to the road and have a huge impact on traffic-related pollution. Knowing their behaviour, thus being able to use them at their best and reducing their wear [...] Read more.
Tyres are one of the most important elements of a vehicle because they are the link to the road and have a huge impact on traffic-related pollution. Knowing their behaviour, thus being able to use them at their best and reducing their wear rate, is one of the means of improving their lifetime, which means decreasing traffic environmental impact. In order to understand how tyres behave and to predict the real-time tyre–road coefficient of friction, which is strongly influenced by the temperature, in the last few years several complex thermo-mechanical models of heat transfer inside the tyre have been developed. However, in the current state of the art of the literature and practice, there is still an important parameter regarding such models that is not deeply studied. This parameter is the heat transfer coefficient between the tyre and the road at the contact patch, which usually is considered as a constant. The current research paper allows understanding that such an approximation is not always valid for all of the speeds and tyre loads of city and race cars; instead, it is developed an equation that, for the first time, calculates the real-time, dynamic tyre–road heat transfer coefficient, taking into account the tyre’s travelling speed and the footprint length. The equation results are in good agreement with the empirical values coming from the literature and permit understanding how much such a parameter can vary, depending on the tyre use range. The formulation is simple enough to be easily implemented in existing thermodynamic tyre models without requiring meaningful computational time. Full article
(This article belongs to the Special Issue Novel Research on Heat Transfer and Thermodynamics)
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