YaBeSH Engineering and Technology Library

    • Journals
    • PaperQuest
    • YSE Standards
    • YaBeSH
    • Login
    View Item 
    •   YE&T Library
    • ASME
    • Journal of Heat Transfer
    • View Item
    •   YE&T Library
    • ASME
    • Journal of Heat Transfer
    • View Item
    • All Fields
    • Source Title
    • Year
    • Publisher
    • Title
    • Subject
    • Author
    • DOI
    • ISBN
    Advanced Search
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Archive

    Experimental and Theoretical Investigation of Nucleation Site Density and Heat Transfer During Dropwise Condensation on Thin Hydrophobic Coatings

    Source: Journal of Heat Transfer:;2022:;volume( 144 ):;issue: 006::page 61601-1
    Author:
    Sablowski, Jakob
    ,
    Galle, Lydia
    ,
    Grothe, Julia
    ,
    Roudini, Mehrzad
    ,
    Winkler, Andreas
    ,
    Unz, Simon
    ,
    Beckmann, Michael
    DOI: 10.1115/1.4053922
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Dropwise condensation (DWC) has the potential to enhance heat transfer compared to filmwise condensation (FWC). The heat transfer rates achieved by DWC depend on the drop size distribution, which is influenced by nucleation processes of newly formed drops. In DWC modeling, the nucleation site density Ns is used as an input parameter to obtain the drop size distribution of small drops. However, due to the small scale of the condensate nuclei, direct observation is difficult, and experimental data on the nucleation site density are scarce. In the literature, values in the range of 109 m−2 to 1015 m−2 can be found for Ns. In this paper, we report DWC experiments on SiO2 and 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) thin hydrophobic coatings that show significantly different nucleation site densities. Nucleation site densities are estimated from high-speed imaging of small drops during initial condensation and from model calibration using established DWC theory. We have found the values for Ns to be in the range from 1.1×1010 m−2 to 5.1×1011 m−2 for the SiO2 coating and 1011 m−2 to 1013 m−2 for the PFDTES coating. Our results show that there can be large differences in the nucleation site density under similar conditions depending on the surface properties. This underlines the importance of investigating nucleation site density specifically for each surface and under consideration of the specific process conditions used for DWC.
    • Download: (3.472Mb)
    • Show Full MetaData Hide Full MetaData
    • Get RIS
    • Item Order
    • Go To Publisher
    • Price: 5000 Rial
    • Statistics

      Experimental and Theoretical Investigation of Nucleation Site Density and Heat Transfer During Dropwise Condensation on Thin Hydrophobic Coatings

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4285115
    Collections
    • Journal of Heat Transfer

    Show full item record

    contributor authorSablowski, Jakob
    contributor authorGalle, Lydia
    contributor authorGrothe, Julia
    contributor authorRoudini, Mehrzad
    contributor authorWinkler, Andreas
    contributor authorUnz, Simon
    contributor authorBeckmann, Michael
    date accessioned2022-05-08T09:25:03Z
    date available2022-05-08T09:25:03Z
    date copyright4/5/2022 12:00:00 AM
    date issued2022
    identifier issn0022-1481
    identifier otherht_144_06_061601.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4285115
    description abstractDropwise condensation (DWC) has the potential to enhance heat transfer compared to filmwise condensation (FWC). The heat transfer rates achieved by DWC depend on the drop size distribution, which is influenced by nucleation processes of newly formed drops. In DWC modeling, the nucleation site density Ns is used as an input parameter to obtain the drop size distribution of small drops. However, due to the small scale of the condensate nuclei, direct observation is difficult, and experimental data on the nucleation site density are scarce. In the literature, values in the range of 109 m−2 to 1015 m−2 can be found for Ns. In this paper, we report DWC experiments on SiO2 and 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) thin hydrophobic coatings that show significantly different nucleation site densities. Nucleation site densities are estimated from high-speed imaging of small drops during initial condensation and from model calibration using established DWC theory. We have found the values for Ns to be in the range from 1.1×1010 m−2 to 5.1×1011 m−2 for the SiO2 coating and 1011 m−2 to 1013 m−2 for the PFDTES coating. Our results show that there can be large differences in the nucleation site density under similar conditions depending on the surface properties. This underlines the importance of investigating nucleation site density specifically for each surface and under consideration of the specific process conditions used for DWC.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental and Theoretical Investigation of Nucleation Site Density and Heat Transfer During Dropwise Condensation on Thin Hydrophobic Coatings
    typeJournal Paper
    journal volume144
    journal issue6
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4053922
    journal fristpage61601-1
    journal lastpage61601-11
    page11
    treeJournal of Heat Transfer:;2022:;volume( 144 ):;issue: 006
    contenttypeFulltext
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian