Cargando…

The Influence of Loop Heat Pipe Evaporator Porous Structure Parameters and Charge on Its Effectiveness for Ethanol and Water as Working Fluids

This paper presents the results of experiments carried out on a specially designed experimental rig designed for the study of capillary pressure generated in the Loop Heat Pipe (LHP) evaporator. The commercially available porous structure made of sintered stainless steel constitutes the wick. Three...

Descripción completa

Detalles Bibliográficos
Autores principales: Blauciak, Krzysztof, Szymanski, Pawel, Mikielewicz, Dariusz
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8623819/
https://www.ncbi.nlm.nih.gov/pubmed/34832434
http://dx.doi.org/10.3390/ma14227029
_version_ 1784606023815790592
author Blauciak, Krzysztof
Szymanski, Pawel
Mikielewicz, Dariusz
author_facet Blauciak, Krzysztof
Szymanski, Pawel
Mikielewicz, Dariusz
author_sort Blauciak, Krzysztof
collection PubMed
description This paper presents the results of experiments carried out on a specially designed experimental rig designed for the study of capillary pressure generated in the Loop Heat Pipe (LHP) evaporator. The commercially available porous structure made of sintered stainless steel constitutes the wick. Three different geometries of the porous wicks were tested, featuring the pore radius of 1, 3 and 7 µm. Ethanol and water as two different working fluids were tested at three different evaporator temperatures and three different installation charges. The paper firstly presents distributions of generated pressure in the LHP, indicating that the capillary pressure difference is generated in the porous structure. When installing with a wick that has a pore size of 1 μm and water as a working fluid, the pressure difference can reach up to 2.5 kPa at the installation charge of 65 mL. When installing with a wick that has a pore size of 1 μm and ethanol as a working fluid, the pressure difference can reach up to 2.1 kPa at the installation charge of 65 mL. The integral characteristics of the LHP were developed, namely, the mass flow rate vs. applied heat flux for both fluids. The results show that water offers larger pressure differences for developing the capillary pressure effect in the installation in comparison to ethanol. Additionally, this research presents the feasibility of manufacturing inexpensive LHPs with filter medium as a wick material and its influence on the LHP’s thermal performance.
format Online
Article
Text
id pubmed-8623819
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-86238192021-11-27 The Influence of Loop Heat Pipe Evaporator Porous Structure Parameters and Charge on Its Effectiveness for Ethanol and Water as Working Fluids Blauciak, Krzysztof Szymanski, Pawel Mikielewicz, Dariusz Materials (Basel) Article This paper presents the results of experiments carried out on a specially designed experimental rig designed for the study of capillary pressure generated in the Loop Heat Pipe (LHP) evaporator. The commercially available porous structure made of sintered stainless steel constitutes the wick. Three different geometries of the porous wicks were tested, featuring the pore radius of 1, 3 and 7 µm. Ethanol and water as two different working fluids were tested at three different evaporator temperatures and three different installation charges. The paper firstly presents distributions of generated pressure in the LHP, indicating that the capillary pressure difference is generated in the porous structure. When installing with a wick that has a pore size of 1 μm and water as a working fluid, the pressure difference can reach up to 2.5 kPa at the installation charge of 65 mL. When installing with a wick that has a pore size of 1 μm and ethanol as a working fluid, the pressure difference can reach up to 2.1 kPa at the installation charge of 65 mL. The integral characteristics of the LHP were developed, namely, the mass flow rate vs. applied heat flux for both fluids. The results show that water offers larger pressure differences for developing the capillary pressure effect in the installation in comparison to ethanol. Additionally, this research presents the feasibility of manufacturing inexpensive LHPs with filter medium as a wick material and its influence on the LHP’s thermal performance. MDPI 2021-11-19 /pmc/articles/PMC8623819/ /pubmed/34832434 http://dx.doi.org/10.3390/ma14227029 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Blauciak, Krzysztof
Szymanski, Pawel
Mikielewicz, Dariusz
The Influence of Loop Heat Pipe Evaporator Porous Structure Parameters and Charge on Its Effectiveness for Ethanol and Water as Working Fluids
title The Influence of Loop Heat Pipe Evaporator Porous Structure Parameters and Charge on Its Effectiveness for Ethanol and Water as Working Fluids
title_full The Influence of Loop Heat Pipe Evaporator Porous Structure Parameters and Charge on Its Effectiveness for Ethanol and Water as Working Fluids
title_fullStr The Influence of Loop Heat Pipe Evaporator Porous Structure Parameters and Charge on Its Effectiveness for Ethanol and Water as Working Fluids
title_full_unstemmed The Influence of Loop Heat Pipe Evaporator Porous Structure Parameters and Charge on Its Effectiveness for Ethanol and Water as Working Fluids
title_short The Influence of Loop Heat Pipe Evaporator Porous Structure Parameters and Charge on Its Effectiveness for Ethanol and Water as Working Fluids
title_sort influence of loop heat pipe evaporator porous structure parameters and charge on its effectiveness for ethanol and water as working fluids
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8623819/
https://www.ncbi.nlm.nih.gov/pubmed/34832434
http://dx.doi.org/10.3390/ma14227029
work_keys_str_mv AT blauciakkrzysztof theinfluenceofloopheatpipeevaporatorporousstructureparametersandchargeonitseffectivenessforethanolandwaterasworkingfluids
AT szymanskipawel theinfluenceofloopheatpipeevaporatorporousstructureparametersandchargeonitseffectivenessforethanolandwaterasworkingfluids
AT mikielewiczdariusz theinfluenceofloopheatpipeevaporatorporousstructureparametersandchargeonitseffectivenessforethanolandwaterasworkingfluids
AT blauciakkrzysztof influenceofloopheatpipeevaporatorporousstructureparametersandchargeonitseffectivenessforethanolandwaterasworkingfluids
AT szymanskipawel influenceofloopheatpipeevaporatorporousstructureparametersandchargeonitseffectivenessforethanolandwaterasworkingfluids
AT mikielewiczdariusz influenceofloopheatpipeevaporatorporousstructureparametersandchargeonitseffectivenessforethanolandwaterasworkingfluids