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Energies
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Heat and Mass Transfer 2023
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Heat and Mass Transfer 2023

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 (20 August 2023) | Viewed by 3337

Special Issue Editors

Prof. Dr. Aleksandr Pavlenko

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Guest Editor
Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Interests: hydrodynamics and heat/mass transfer processes in multiphase systems; transfer processes and crisis phenomena at boiling and evaporation; flow and decomposition of liquid films at intense evaporation and boiling, including non-steady laws of heat release; heat/mass transfer in cryogenic systems, hydrodynamic, and mass transfer processes in separation columns with regular packing; heat transfer enhancement in compact plate fin heat exchangers and on the structured surfaces
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Pavel Skripov

E-Mail Website
Guest Editor
Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Amundsen st. 107a, Yekaterinburg, Russia
Interests: heat transfer; thermal engineering; nanofluids; thermophysical properties; oils; fluid; polymers; pulse; nucleation; thermal conductivity
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Heat transfer problems have come to the forefront of thermophysical research in the 21st century. Indeed, the modern development of technologies is accompanied by a continuous increase in requirements for the level of the removed heat flux densities and improvements in the safety and sustainable operation of heat/mass-transfer equipment. The increased level of requirements is due, among other reasons, to the miniaturization of heat-generating surfaces, which is a modern trend. The response of the thermoengineering community to this challenge is developing in several distinct directions, including both passive and active techniques for heat-transfer enhancement.

The topics of interest include, but are not limited to, the following:

  • Non-equilibrium and not fully stable media, including mini/microsystems;
  • Thermophysical problems of micro-electronics and power electronics cooling and thermal stabilization of HTS devices;
  • Heat-transfer enhancement during boiling and evaporation on modified surfaces with a hierarchical structure;
  • Intensification of the non-stationary cooling of superheated bodies using different coatings;
  • Critical/supercritical phenomena;
  • Destruction due to cooling with boiling cryogenic liquid;
  • Vapor explosion;
  • Volcanic eruptions;
  • Mixtures having LCST/UCST;
  • Mini/microchannels;
  • Nano/microfluidics;
  • Combustion processes of gas–vapor–droplet flows, including multicomponent media.

Prof. Dr. Aleksandr Pavlenko
Prof. Dr. Pavel Skripov
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.

Published Papers (3 papers)

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Research

22 pages, 5991 KiB  
Article
Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface
by Dmitrii V. Antonov, Anastasia G. Islamova and Evgeniya G. Orlova
Energies 2023, 16(22), 7505; https://doi.org/10.3390/en16227505 - 9 Nov 2023
Viewed by 1038
Abstract
The characteristics of water droplet heating and evaporation on structured hydrophobic and hydrophilic surfaces in the range of static contact angles from 73° to 155° were studied experimentally using high-speed video recording. Two fundamentally different technologies for applying coatings on a metal surface [...] Read more.
The characteristics of water droplet heating and evaporation on structured hydrophobic and hydrophilic surfaces in the range of static contact angles from 73° to 155° were studied experimentally using high-speed video recording. Two fundamentally different technologies for applying coatings on a metal surface were used in comparison with the results on a polished surface. Microscopic studies were conducted to identify the features of the formed coatings. The wetting properties were characterized by means of the static contact angle and the contact angle hysteresis: on polished surface No. 1 (contact angle—73°, hysteresis—11°), on structured surface No. 2 (contact angle—125°, hysteresis—9°), and on structured surface No 3 (contact angle—155°, hysteresis—7°). The experimental dependences of the droplet evaporation rate on the different surfaces under normal conditions (ambient air temperature—293 K, atmospheric pressure, humidity—35%) were obtained. The evaporation regimes of droplets on the surfaces under study were identified. Water droplets evaporated in the pinning mode on surfaces No. 1 and No. 2. When a water droplet evaporated on surface No 3, the droplet was in the constant contact angle regime for ≈90% of its lifetime. Based on the experimental data obtained, a two-dimensional model of conjugate heat and mass transfer was developed, which describes the heating and evaporation of a liquid droplet on structured hydrophobic and hydrophilic surfaces at a wide range of contact angles. Satisfactory agreement was obtained between the numerical simulation results and experimental data. Using the model, the fields of temperature, concentration and other key characteristics were established at different points in time. Recommendations for its application in the development of gas–vapor–droplet applications were formulated. Full article
(This article belongs to the Special Issue Heat and Mass Transfer 2023)
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16 pages, 7882 KiB  
Article
Experimental Investigation on Thermal Performance of Vapor Chambers with Diffident Wick Structures
by Yujuan Xia, Feng Yao and Mengxiang Wang
Energies 2023, 16(18), 6464; https://doi.org/10.3390/en16186464 - 7 Sep 2023
Viewed by 877
Abstract
In this paper, a type of vapor chamber with a gradient pore size wick (VC-G) was developed, and its thermal performance was experimentally tested and compared with two types of VCs with uniform pore size wick (which can be defined as VC-U (200) [...] Read more.
In this paper, a type of vapor chamber with a gradient pore size wick (VC-G) was developed, and its thermal performance was experimentally tested and compared with two types of VCs with uniform pore size wick (which can be defined as VC-U (200) and VC-U (50) as the powder size of the wick is 50-mesh and 200-mesh, respectively) and a VC without a wick (VC-N). In addition, a VC heat transfer ability experiment platform was built, and the thermal resistance, temperature distribution and thermal response time of the VC with different wick structures were experimentally investigated. The experiment results show that the capillary driving force provided by gradient pore size wick increases gradually from outside, which can not only promote the condensation fluid to gather in the central heat source but also facilitate the vapor to spread around. Therefore, compared with VC-U (200), VC-U (50) and VC-N, VC-G shows the best heat transfer performance, temperature uniform performance and start-up performance. Full article
(This article belongs to the Special Issue Heat and Mass Transfer 2023)
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13 pages, 3250 KiB  
Article
Characterization of Thermophysical and Electrical Properties of SiC and BN Nanofluids
by Wagd Ajeeb and S. M. Sohel Murshed
Energies 2023, 16(9), 3768; https://doi.org/10.3390/en16093768 - 28 Apr 2023
Cited by 4 | Viewed by 968
Abstract
Experimental data associated with the thermophysical properties (TPPs) of various nanofluids (NFs) are essential for their diverse applications in energy storage and conversion, as well as thermal management. This study experimentally investigated important TPPs such as thermal conductivity (TC), thermal diffusivity, density and [...] Read more.
Experimental data associated with the thermophysical properties (TPPs) of various nanofluids (NFs) are essential for their diverse applications in energy storage and conversion, as well as thermal management. This study experimentally investigated important TPPs such as thermal conductivity (TC), thermal diffusivity, density and viscosity, as well as the electrical conductivity of two new types of NFs, namely silica (SiC) and boron nitride (BN) nanofluids. The NFs are prepared at five low concentrations of nanoparticles from 0.01 to 0.05 vol.% dispersed into a mixture of ethylene glycol (EG) and distilled water (DW). The TPPs are measured, and their enhancements are evaluated in comparison with their base fluids. The results show a good increase in TC and thermal diffusivity for both types of nanofluids with increasing concentrations until reaching the maximum enhancement of about 4.4% for the SiC nanofluid and about 7.0% for the BN nanofluid at the same concentration (0.05 vol.%). On other hand, a Newtonian rheological behaviour is observed, and viscosity and density are also found to increase for both types of NFs, where the maximum increase in viscosity and density at 0.05 vol.% are found to be 5.2% and 0.3%, respectively. The electrical conductivity also increases by up to 3.2 times for SiC nanofluids and 2.8 times for BN nanofluids at the maximum concentration of these nanoparticles (0.05 vol.%) compared with the base fluid (EG/DW). The overall evaluation of the obtained results demonstrates the great potential of these nanofluids in heat transfer applications. Full article
(This article belongs to the Special Issue Heat and Mass Transfer 2023)
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