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...
Autores principales: | , , |
---|---|
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 |