Localized Characteristics of the First Three Typical Condensation Frosting Stages in the Edge Region of a Horizontal Cold Plate
Condensation frosting usually causes a negative influence on heat exchangers employed in engineering fields. As the relationships among the first three typical condensation frosting stages in the edge regions of cold plates are still unclear, an experimental study on the localized condensation frost...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/13/11/1906 |
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| author | Long Zhang Mengjie Song Christopher Yu Hang Chao Chaobin Dang Jun Shen |
| author_facet | Long Zhang Mengjie Song Christopher Yu Hang Chao Chaobin Dang Jun Shen |
| author_sort | Long Zhang |
| collection | DOAJ |
| description | Condensation frosting usually causes a negative influence on heat exchangers employed in engineering fields. As the relationships among the first three typical condensation frosting stages in the edge regions of cold plates are still unclear, an experimental study on the localized condensation frosting characteristics in the edge region of a cold plate was conducted. The edge effects on the water droplet condensation (WDC), water droplet frozen (WDF) and frost layer growth characteristics were quantitatively investigated. The results showed that the number of droplets coalescing in the edge-affected regions was around 50% greater than in the unaffected regions. At the end of the WDC stages, the area-average equivalent contact diameter and coverage area ratio of water droplets in the edge-affected regions were 2.69 times and 11.6% greater than those in the unaffected regions under natural convection, and the corresponding values were 2.24 times and 9.9% under forced convection. Compared with the unaffected regions, the WDF stage duration in the edge-affected regions decreased by 63.6% and 95.3% under natural and forced convection, respectively. Additionally, plate-type and feather-type frost crystals were, respectively, observed in natural and forced convection. The results of this study can help in the better understanding of the condensation frosting mechanism on a cold plate, which provides guidelines for optimizing the design of heat exchanger structures and system control strategies facing frosting problems. |
| first_indexed | 2024-03-09T18:49:58Z |
| format | Article |
| id | doaj.art-72163cff5143484891b44f437fa11594 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-09T18:49:58Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-72163cff5143484891b44f437fa115942023-11-24T05:55:01ZengMDPI AGMicromachines2072-666X2022-11-011311190610.3390/mi13111906Localized Characteristics of the First Three Typical Condensation Frosting Stages in the Edge Region of a Horizontal Cold PlateLong Zhang0Mengjie Song1Christopher Yu Hang Chao2Chaobin Dang3Jun Shen4Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaDepartment of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaDepartment of Building Environment and Energy Engineering & Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, ChinaGraduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, JapanDepartment of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaCondensation frosting usually causes a negative influence on heat exchangers employed in engineering fields. As the relationships among the first three typical condensation frosting stages in the edge regions of cold plates are still unclear, an experimental study on the localized condensation frosting characteristics in the edge region of a cold plate was conducted. The edge effects on the water droplet condensation (WDC), water droplet frozen (WDF) and frost layer growth characteristics were quantitatively investigated. The results showed that the number of droplets coalescing in the edge-affected regions was around 50% greater than in the unaffected regions. At the end of the WDC stages, the area-average equivalent contact diameter and coverage area ratio of water droplets in the edge-affected regions were 2.69 times and 11.6% greater than those in the unaffected regions under natural convection, and the corresponding values were 2.24 times and 9.9% under forced convection. Compared with the unaffected regions, the WDF stage duration in the edge-affected regions decreased by 63.6% and 95.3% under natural and forced convection, respectively. Additionally, plate-type and feather-type frost crystals were, respectively, observed in natural and forced convection. The results of this study can help in the better understanding of the condensation frosting mechanism on a cold plate, which provides guidelines for optimizing the design of heat exchanger structures and system control strategies facing frosting problems.https://www.mdpi.com/2072-666X/13/11/1906condensation frostingedge effectdroplet size and distributionfreezing wave propagationfrost layer surface roughness |
| spellingShingle | Long Zhang Mengjie Song Christopher Yu Hang Chao Chaobin Dang Jun Shen Localized Characteristics of the First Three Typical Condensation Frosting Stages in the Edge Region of a Horizontal Cold Plate Micromachines condensation frosting edge effect droplet size and distribution freezing wave propagation frost layer surface roughness |
| title | Localized Characteristics of the First Three Typical Condensation Frosting Stages in the Edge Region of a Horizontal Cold Plate |
| title_full | Localized Characteristics of the First Three Typical Condensation Frosting Stages in the Edge Region of a Horizontal Cold Plate |
| title_fullStr | Localized Characteristics of the First Three Typical Condensation Frosting Stages in the Edge Region of a Horizontal Cold Plate |
| title_full_unstemmed | Localized Characteristics of the First Three Typical Condensation Frosting Stages in the Edge Region of a Horizontal Cold Plate |
| title_short | Localized Characteristics of the First Three Typical Condensation Frosting Stages in the Edge Region of a Horizontal Cold Plate |
| title_sort | localized characteristics of the first three typical condensation frosting stages in the edge region of a horizontal cold plate |
| topic | condensation frosting edge effect droplet size and distribution freezing wave propagation frost layer surface roughness |
| url | https://www.mdpi.com/2072-666X/13/11/1906 |
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