Entropic analysis of a double helical tube heat exchanger including circular depressions on both inner and outer tube
In this research, entropic analysis of a double helical tube heat exchanger including circular depressions on both inner tube and outer tube is provided. Experimentally validated 3D numerical simulation is employed to reach the aim of this study. Entropic characteristics of four cases are investigat...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-08-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X21002161 |
| _version_ | 1818728152105484288 |
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| author | Yan Cao Hamdi Ayed Hamed Sadighi Dizaji Mehran Hashemian Makatar Wae-hayee |
| author_facet | Yan Cao Hamdi Ayed Hamed Sadighi Dizaji Mehran Hashemian Makatar Wae-hayee |
| author_sort | Yan Cao |
| collection | DOAJ |
| description | In this research, entropic analysis of a double helical tube heat exchanger including circular depressions on both inner tube and outer tube is provided. Experimentally validated 3D numerical simulation is employed to reach the aim of this study. Entropic characteristics of four cases are investigated and reported. In case “a” both inner tube and outer tube are smooth. In case “b”, circular depressions are created on only inner tube while in case “c” both tubes contain circular depression. Case “d” is the same as case “c” while the depression arrangement is different from case “c”. Dimensionless entropy generation and dimensionless Nu number are used to evaluate the proposed designs based on the first and second laws of thermodynamics. Moreover, heat transfer improvement (HTI) factor is adopted to consider the impacts of said two parameters simultaneously. Results demonstrate that, although creating circular depressions on both tubes significantly improves the heat transfer characteristics of the heat exchanger, it increases the entropy generation level of heat exchanger as well. Case “d” in which the location of any circular depression of the outer tube is placed between any two continuous depressions of the inner tube, gives the highest thermal performance and also entropy generation. |
| first_indexed | 2024-12-17T22:25:27Z |
| format | Article |
| id | doaj.art-8e8477f5d0874f6daaf300cecb1e1551 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-17T22:25:27Z |
| publishDate | 2021-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-8e8477f5d0874f6daaf300cecb1e15512022-12-21T21:30:21ZengElsevierCase Studies in Thermal Engineering2214-157X2021-08-0126101053Entropic analysis of a double helical tube heat exchanger including circular depressions on both inner and outer tubeYan Cao0Hamdi Ayed1Hamed Sadighi Dizaji2Mehran Hashemian3Makatar Wae-hayee4School of Mechatronic Engineering, Xi'an Technological University, Xi'an, 710021, ChinaDepartment of Civil Engineering, College of Engineering, King Khalid University, Abha, 61421, Saudi Arabia; Higher Institute of Transport and Logistics of Sousse, University Sousse, TunisiaDepartment of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, IranDepartment of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, Iran; Corresponding author.,Department of Mechanical and Mechatronics Engineering, Faculty of Engineering, Prince of Songkla University, Hatyai, Songkhla, 90112, Thailand; Corresponding author.In this research, entropic analysis of a double helical tube heat exchanger including circular depressions on both inner tube and outer tube is provided. Experimentally validated 3D numerical simulation is employed to reach the aim of this study. Entropic characteristics of four cases are investigated and reported. In case “a” both inner tube and outer tube are smooth. In case “b”, circular depressions are created on only inner tube while in case “c” both tubes contain circular depression. Case “d” is the same as case “c” while the depression arrangement is different from case “c”. Dimensionless entropy generation and dimensionless Nu number are used to evaluate the proposed designs based on the first and second laws of thermodynamics. Moreover, heat transfer improvement (HTI) factor is adopted to consider the impacts of said two parameters simultaneously. Results demonstrate that, although creating circular depressions on both tubes significantly improves the heat transfer characteristics of the heat exchanger, it increases the entropy generation level of heat exchanger as well. Case “d” in which the location of any circular depression of the outer tube is placed between any two continuous depressions of the inner tube, gives the highest thermal performance and also entropy generation.http://www.sciencedirect.com/science/article/pii/S2214157X21002161Helically coiled double tubeThermal entropyFrictional entropy |
| spellingShingle | Yan Cao Hamdi Ayed Hamed Sadighi Dizaji Mehran Hashemian Makatar Wae-hayee Entropic analysis of a double helical tube heat exchanger including circular depressions on both inner and outer tube Case Studies in Thermal Engineering Helically coiled double tube Thermal entropy Frictional entropy |
| title | Entropic analysis of a double helical tube heat exchanger including circular depressions on both inner and outer tube |
| title_full | Entropic analysis of a double helical tube heat exchanger including circular depressions on both inner and outer tube |
| title_fullStr | Entropic analysis of a double helical tube heat exchanger including circular depressions on both inner and outer tube |
| title_full_unstemmed | Entropic analysis of a double helical tube heat exchanger including circular depressions on both inner and outer tube |
| title_short | Entropic analysis of a double helical tube heat exchanger including circular depressions on both inner and outer tube |
| title_sort | entropic analysis of a double helical tube heat exchanger including circular depressions on both inner and outer tube |
| topic | Helically coiled double tube Thermal entropy Frictional entropy |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X21002161 |
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