Numerical study of the boiling heat transfer characteristics of bluff body quenching in cylindrical tube
The present study numerically investigates the characteristics of the forced immersion quenching widely used in material manufacturing processes. The numerical simulation considers the boiling heat transfer occurring at the surface of the hot cylindrical specimen heated at 870 °C during the quenchin...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-04-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X22001460 |
| _version_ | 1818288410871201792 |
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| author | Joo Hyun Moon Jungho Lee Seong Hyuk Lee |
| author_facet | Joo Hyun Moon Jungho Lee Seong Hyuk Lee |
| author_sort | Joo Hyun Moon |
| collection | DOAJ |
| description | The present study numerically investigates the characteristics of the forced immersion quenching widely used in material manufacturing processes. The numerical simulation considers the boiling heat transfer occurring at the surface of the hot cylindrical specimen heated at 870 °C during the quenching process with a 20 °C water jet. It also examines the influence of water jet velocity on the forced-immersion quenching process. Once the water flow initially impinges on the top side of the hot steel specimen, a large amount of vapor gets generated but disappears from all sides within a few seconds. The amount of vapor decreases with increased water jet velocity due to the high convective heat transfer, leading to vapor condensation. Moreover, a larger recirculation region appears at the sidewall with high water flow velocity because water vapor formed near the wall escapes. Therefore, the cooling performance of the specimen can primarily be attributed to the boiling and convective heat transfer that occurs within a few seconds. The heat flux and heat transfer coefficient increase with the inlet velocity. Moreover, the cooling rate and uniformity are enhanced owing to the increased boiling and convective heat transfer. |
| first_indexed | 2024-12-13T01:55:57Z |
| format | Article |
| id | doaj.art-f6f366d0c1534181ad556d85d7b60471 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-13T01:55:57Z |
| publishDate | 2022-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-f6f366d0c1534181ad556d85d7b604712022-12-22T00:03:24ZengElsevierCase Studies in Thermal Engineering2214-157X2022-04-0132101900Numerical study of the boiling heat transfer characteristics of bluff body quenching in cylindrical tubeJoo Hyun Moon0Jungho Lee1Seong Hyuk Lee2Department of Mechanical and Aerospace Engineering, Sejong University, Republic of KoreaDepartment of Mechanical Engineering, Ajou University, Suwon, 16499, Republic of Korea; Corresponding author. Department of Mechanical Engineering, Ajou University, Suwon, 16499, Republic of Korea.School of Mechanical Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea; Department of Intelligent Energy and Industry, Chung-Ang University, Seoul, 06974, Republic of Korea; Corresponding author. School of Mechanical Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea.The present study numerically investigates the characteristics of the forced immersion quenching widely used in material manufacturing processes. The numerical simulation considers the boiling heat transfer occurring at the surface of the hot cylindrical specimen heated at 870 °C during the quenching process with a 20 °C water jet. It also examines the influence of water jet velocity on the forced-immersion quenching process. Once the water flow initially impinges on the top side of the hot steel specimen, a large amount of vapor gets generated but disappears from all sides within a few seconds. The amount of vapor decreases with increased water jet velocity due to the high convective heat transfer, leading to vapor condensation. Moreover, a larger recirculation region appears at the sidewall with high water flow velocity because water vapor formed near the wall escapes. Therefore, the cooling performance of the specimen can primarily be attributed to the boiling and convective heat transfer that occurs within a few seconds. The heat flux and heat transfer coefficient increase with the inlet velocity. Moreover, the cooling rate and uniformity are enhanced owing to the increased boiling and convective heat transfer.http://www.sciencedirect.com/science/article/pii/S2214157X22001460Computational fluid dynamicsConjugate heat transferQuenchingNumerical simulationVolume of fluid |
| spellingShingle | Joo Hyun Moon Jungho Lee Seong Hyuk Lee Numerical study of the boiling heat transfer characteristics of bluff body quenching in cylindrical tube Case Studies in Thermal Engineering Computational fluid dynamics Conjugate heat transfer Quenching Numerical simulation Volume of fluid |
| title | Numerical study of the boiling heat transfer characteristics of bluff body quenching in cylindrical tube |
| title_full | Numerical study of the boiling heat transfer characteristics of bluff body quenching in cylindrical tube |
| title_fullStr | Numerical study of the boiling heat transfer characteristics of bluff body quenching in cylindrical tube |
| title_full_unstemmed | Numerical study of the boiling heat transfer characteristics of bluff body quenching in cylindrical tube |
| title_short | Numerical study of the boiling heat transfer characteristics of bluff body quenching in cylindrical tube |
| title_sort | numerical study of the boiling heat transfer characteristics of bluff body quenching in cylindrical tube |
| topic | Computational fluid dynamics Conjugate heat transfer Quenching Numerical simulation Volume of fluid |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X22001460 |
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