A theoretical study of condensation heat transfer in tubes with novel cross-sections
This paper presents a numerical study of stratified flow condensation heat transfer in tubes with novel cross-section designs. A design framework of the novel cross-section geometry was developed by first studying and analyzing the condensate film distribution in a circular tube. It was found that t...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/170428 |
| _version_ | 1811696158273175552 |
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| author | Lee, Y. W. Ho, Jin Yao Leong, Kai Choong Wong, Teck Neng |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Lee, Y. W. Ho, Jin Yao Leong, Kai Choong Wong, Teck Neng |
| author_sort | Lee, Y. W. |
| collection | NTU |
| description | This paper presents a numerical study of stratified flow condensation heat transfer in tubes with novel cross-section designs. A design framework of the novel cross-section geometry was developed by first studying and analyzing the condensate film distribution in a circular tube. It was found that the circular arc diameter and orientation have effects on the condensate film thickness. Based on this understanding, four different cross-section designs (models N1, N2, N3 and N4) formed by connecting circular arcs of different curvatures at various orientations were proposed. The heat transfer performances of these models were compared to a circular tube of the same perimeter. Our simulations show that all models possess higher average heat transfer coefficients than a circular tube when no accumulated condensate layer is present. Among all the models proposed, model N4 exhibits the largest heat transfer enhancement ratio of 1.42 at ∊ = 0.96. The design of model N4 utilizes small circular arcs which are arranged in an orientation that increases the effect of the gravitational force, providing significant condensate film thickness reduction over a large area. This study not only demonstrates the possibility of enhancing condensation heat transfer by simply varying the tube curvature but also provided a design guideline which can be employed for the development of novel cross-section tubes that can be fabricated by advanced manufacturing techniques such as selective laser melting. |
| first_indexed | 2024-10-01T07:34:55Z |
| format | Journal Article |
| id | ntu-10356/170428 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:34:55Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1704282023-09-12T02:30:07Z A theoretical study of condensation heat transfer in tubes with novel cross-sections Lee, Y. W. Ho, Jin Yao Leong, Kai Choong Wong, Teck Neng School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Stratified Flow Condensation Heat Transfer This paper presents a numerical study of stratified flow condensation heat transfer in tubes with novel cross-section designs. A design framework of the novel cross-section geometry was developed by first studying and analyzing the condensate film distribution in a circular tube. It was found that the circular arc diameter and orientation have effects on the condensate film thickness. Based on this understanding, four different cross-section designs (models N1, N2, N3 and N4) formed by connecting circular arcs of different curvatures at various orientations were proposed. The heat transfer performances of these models were compared to a circular tube of the same perimeter. Our simulations show that all models possess higher average heat transfer coefficients than a circular tube when no accumulated condensate layer is present. Among all the models proposed, model N4 exhibits the largest heat transfer enhancement ratio of 1.42 at ∊ = 0.96. The design of model N4 utilizes small circular arcs which are arranged in an orientation that increases the effect of the gravitational force, providing significant condensate film thickness reduction over a large area. This study not only demonstrates the possibility of enhancing condensation heat transfer by simply varying the tube curvature but also provided a design guideline which can be employed for the development of novel cross-section tubes that can be fabricated by advanced manufacturing techniques such as selective laser melting. Ministry of Education (MOE) Nanyang Technological University J.Y.H. would like to acknowledge the financial support for his research appointment at the University of Illinois at Urbana-Champaign, USA under the College of Engineering (CoE) International Postdoctoral Fellowship Scholarship (IPS) provided jointly by the Ministry of Education, Singapore and Nanyang Technological University, Singapore. 2023-09-12T02:30:07Z 2023-09-12T02:30:07Z 2022 Journal Article Lee, Y. W., Ho, J. Y., Leong, K. C. & Wong, T. N. (2022). A theoretical study of condensation heat transfer in tubes with novel cross-sections. Thermal Science and Engineering Progress, 28, 101075-. https://dx.doi.org/10.1016/j.tsep.2021.101075 2451-9049 https://hdl.handle.net/10356/170428 10.1016/j.tsep.2021.101075 2-s2.0-85122311191 28 101075 en Thermal Science and Engineering Progress © 2021 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Stratified Flow Condensation Heat Transfer Lee, Y. W. Ho, Jin Yao Leong, Kai Choong Wong, Teck Neng A theoretical study of condensation heat transfer in tubes with novel cross-sections |
| title | A theoretical study of condensation heat transfer in tubes with novel cross-sections |
| title_full | A theoretical study of condensation heat transfer in tubes with novel cross-sections |
| title_fullStr | A theoretical study of condensation heat transfer in tubes with novel cross-sections |
| title_full_unstemmed | A theoretical study of condensation heat transfer in tubes with novel cross-sections |
| title_short | A theoretical study of condensation heat transfer in tubes with novel cross-sections |
| title_sort | theoretical study of condensation heat transfer in tubes with novel cross sections |
| topic | Engineering::Mechanical engineering Stratified Flow Condensation Heat Transfer |
| url | https://hdl.handle.net/10356/170428 |
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