Special Issue "Photo Thermal Conversion and Pool Boiling Heat Transfer of Nanofluid"

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

Deadline for manuscript submissions: 30 April 2020.

Special Issue Editor

Prof. Dr. Honghyun Cho
E-Mail Website
Guest Editor
Department of Mechanical Engineering, Chosun University, Gwangju, South Korea
Interests: energy; thermal power; heat transfer; refrigerator cycle technologies

Special Issue Information

Dear Colleagues,

The Guest Editors invite you to submit a Special Issue of Energies on the subject “Photo Thermal Conversion and Pool Boiling Heat Transfer of Nanofluids”. As the importance of renewable energy for replacing fossil fuels has become an issue in the world, the efficient use of energy regarding thermal systems and equipment is required, and thus the use of nanofluids for the increase of efficiency and heat transfer is emphasized. Nanofluids are a major way to improve the poor thermal properties of conventional working fluids such as water, oil, and antifreeze solution. In addition, they can be used in heat energy application fields (especially light–thermal conversion and boiling heat transfer in PTC, CPC, the direct absorption solar heat-collection system, heat pipes, heat exchangers, etc.) because they improve various heat transfer modes such as convection, boiling, and photo-thermal conversion. We therefore invite papers on innovative technical developments, reviews, case studies, analytical papers, as well as assessment papers, from different disciplines, which are relevant to sustainable and renewable energy systems on the applications of nanofluids. The Special Issue will focus on but is not limited to the utilization of light absorption and the boiling heat transfer of various nanofluids.

Prof. Dr. Honghyun Cho
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 papers will be 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 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

  • nanofluids
  • photo-thermal conversion
  • optical absorption
  • solar collector
  • direct absorption solar collector
  • boiling heat transfer
  • solar energy
  • solar collection system
  • magnetic heat transfer improvement technology

Published Papers (3 papers)

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Research

Open AccessArticle
Thermal Property Measurement of Nanofluid Droplets with Temperature Gradients
Energies 2020, 13(1), 244; https://doi.org/10.3390/en13010244 - 03 Jan 2020
Abstract
In this study, the 3ω method was used to determine the thermal conductivity of nanofluids (ethylene glycol containing multi-walled carbon nanotubes (MWCNTs)) with temperature gradients. The thermal modeling of the traditional 3ω method was modified to measure the spatial variation of thermal conductivity [...] Read more.
In this study, the 3ω method was used to determine the thermal conductivity of nanofluids (ethylene glycol containing multi-walled carbon nanotubes (MWCNTs)) with temperature gradients. The thermal modeling of the traditional 3ω method was modified to measure the spatial variation of thermal conductivity within a droplet of nanofluid. A direct current (DC) heater was used to generate a temperature gradient inside a sample fluid. A DC heating power of 14 mW was used to provide a temperature gradient of 5000 K/m inside the sample fluid. The thermal conductivity was monitored at hot- and cold-side 3ω heaters with a spacing of 0.3 mm. Regarding the measurement results for the hot and cold 3ω heaters, when the temperature gradient was applied, the maximum thermal conductivity difference was determined to be 3% of the original value. By assuming that the thermo-diffusion of MWCNTs was entirely responsible for this difference, the Soret coefficient of the MWCNTs in the ethylene glycol was calculated to be −0.749 K−1. Full article
(This article belongs to the Special Issue Photo Thermal Conversion and Pool Boiling Heat Transfer of Nanofluid)
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Open AccessArticle
Comparison Study on Photo-Thermal Energy Conversion Performance of Functionalized and Non-Functionalized MWCNT Nanofluid
Energies 2019, 12(19), 3763; https://doi.org/10.3390/en12193763 - 01 Oct 2019
Cited by 1
Abstract
Multiwalled carbon nanotubes (MWCNTs) have attracted attention from researchers because of their superior thermal properties and high optical absorption. In this investigation, the thermal and optical properties of functionalized and nonfunctionalized MWCNT nanofluid based on ethylene glycol/water were experimentally studied and compared. The [...] Read more.
Multiwalled carbon nanotubes (MWCNTs) have attracted attention from researchers because of their superior thermal properties and high optical absorption. In this investigation, the thermal and optical properties of functionalized and nonfunctionalized MWCNT nanofluid based on ethylene glycol/water were experimentally studied and compared. The results indicated that the use of the functionalized MWCNT nanofluid improved the thermal properties and optical absorption performance compared with the nonfunctionalized MWCNT nanofluid. The thermal conductivity enhancement of the functionalized MWCNT nanofluid was higher than that of the nonfunctionalized MWCNT nanofluid. The maximum thermal conductivity enhancement (10.15%) was observed in a functionalized MWCNT concentration of 0.01 wt% at 50 °C compared with the base fluid. In addition, the photo-thermal energy conversion efficiency of the functionalized MWCNT nanofluid was higher than that of the nonfunctionalized one owing to its higher light absorption and thermal conductivity. Full article
(This article belongs to the Special Issue Photo Thermal Conversion and Pool Boiling Heat Transfer of Nanofluid)
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Open AccessFeature PaperArticle
Assessment of Measurement Accuracy of a Micro-PIV Technique for Quantitative Visualization of Al2O3 and MWCNT Nanofluid Flows
Energies 2019, 12(14), 2777; https://doi.org/10.3390/en12142777 - 19 Jul 2019
Abstract
Nanofluids, which are liquids containing nanoparticles, are used to modify heat transfer performance in various systems. To explain the mechanism of heat transfer modification with nanofluids, many theories have been suggested based on numerical simulations without experimental validation because there is no suitable [...] Read more.
Nanofluids, which are liquids containing nanoparticles, are used to modify heat transfer performance in various systems. To explain the mechanism of heat transfer modification with nanofluids, many theories have been suggested based on numerical simulations without experimental validation because there is no suitable experimental method for measuring the velocity fields of nanofluid flows. In this study, the measurement accuracy of micro-particle image velocimetry (μ-PIV) is systemically quantified with Al2O3 and multi-walled carbon nanotube (MWCNT) nanofluids. Image quality, cross-correlation signal-to-noise ratio, displacement difference, and spurious vector ratio are investigated with static images obtained at various focal plane positions along the beam pathway. Applicable depth is enough to investigate micro-scale flows when the concentrations of Al2O3 and MWCNT nanofluids are lower than 0.01% and 0.005%, respectively. The velocity fields of Hagen–Poiseuille flow are measured and compared with theoretical velocity profiles. The measured velocity profiles present good agreement with the theoretical profiles throughout. This study provides the criteria for μ-PIV application and demonstrates that μ-PIV is a promising technique for measuring the velocity field information of nanofluids. Full article
(This article belongs to the Special Issue Photo Thermal Conversion and Pool Boiling Heat Transfer of Nanofluid)
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