View in EDS

Wetting behavior-dependent heat transfer performance during dropwise condensation on engineered hydrophobic surfaces.

Saved in:
Bibliographic Details
Title: Wetting behavior-dependent heat transfer performance during dropwise condensation on engineered hydrophobic surfaces.
Authors: Lo, Chi-Chun1 (AUTHOR), Chen, Li-Jen1,2 (AUTHOR) ljchen@ntu.edu.tw
Source: International Journal of Heat & Mass Transfer. Aug2026, Vol. 264, pN.PAG-N.PAG. 1p.
Subjects: Wetting, Heat transfer, Hydrophobic surfaces, Surface roughness, Film condensation
Abstract: Global water scarcity has intensified the demand for efficient technologies to harvest atmospheric moisture. Dropwise condensation (DWC) stands out for its superior heat transfer performance due to the rapid removal of discrete droplets. However, the efficiency of DWC is governed by the wetting behavior of condensed droplets, which remains a topic of active investigation. Fourteen hydrophobic surfaces with single-micro-scale and dual-scale (micro-nano-scale) roughness were fabricated. The condensed droplets on these surfaces exhibit four wetting states: Wenzel state, Cassie state, partial Cassie (Wenzel-Cassie mixed) state, and Wenzel state with irregular three-phase contact lines. The results demonstrate that stable Cassie DWC can occur on single-micro-scale roughness surfaces, not just on dual-scale roughness surfaces. On single-micro-scale roughness surfaces exhibiting Cassie DWC , high droplet mobility, and an average departure diameter of 741.5 µm, a 33.0% enhancement in both condensate mass collection rate and heat transfer performance is observed relative to the flat substrate. In contrast, Wenzel DWC surfaces show the most significant reductions in both metrics, with degradation of up to 15.9%. Although dual-scale roughness surfaces also exhibit Cassie DWC , condensation mechanisms and limited surface durability reduce condensate collection, resulting in approximately half the condensate mass collection rate compared with single-micro-scale Cassie DWC surfaces. Overall, the lower fabrication cost, simpler processing, and improved durability of single-micro-scale roughness Cassie DWC surfaces present a promising and practical alternative for scalable applications such as power generation, desalination, and thermal management. • The droplet's wetting behavior effect on condensation heat transfer is discussed. • Single-micro-scale surfaces show a + 33% in heat transfer compared to flat substrates. • Single-micro-scale surfaces balance the heat transfer and water collection efficiency. • Dual-scale surfaces can stably maintain the Cassie dropwise condensation. • Coalescence-induced jumping is only observed on dual-scale surfaces. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Heat & Mass Transfer is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 192907746
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Wetting behavior-dependent heat transfer performance during dropwise condensation on engineered hydrophobic surfaces.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Lo%2C+Chi-Chun%22">Lo, Chi-Chun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Li-Jen%22">Chen, Li-Jen</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> ljchen@ntu.edu.tw</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Heat+%26+Mass+Transfer%22">International Journal of Heat & Mass Transfer</searchLink>. Aug2026, Vol. 264, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Wetting%22">Wetting</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+transfer%22">Heat transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrophobic+surfaces%22">Hydrophobic surfaces</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+roughness%22">Surface roughness</searchLink><br /><searchLink fieldCode="DE" term="%22Film+condensation%22">Film condensation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Global water scarcity has intensified the demand for efficient technologies to harvest atmospheric moisture. Dropwise condensation (DWC) stands out for its superior heat transfer performance due to the rapid removal of discrete droplets. However, the efficiency of DWC is governed by the wetting behavior of condensed droplets, which remains a topic of active investigation. Fourteen hydrophobic surfaces with single-micro-scale and dual-scale (micro-nano-scale) roughness were fabricated. The condensed droplets on these surfaces exhibit four wetting states: Wenzel state, Cassie state, partial Cassie (Wenzel-Cassie mixed) state, and Wenzel state with irregular three-phase contact lines. The results demonstrate that stable Cassie DWC can occur on single-micro-scale roughness surfaces, not just on dual-scale roughness surfaces. On single-micro-scale roughness surfaces exhibiting Cassie DWC , high droplet mobility, and an average departure diameter of 741.5 µm, a 33.0% enhancement in both condensate mass collection rate and heat transfer performance is observed relative to the flat substrate. In contrast, Wenzel DWC surfaces show the most significant reductions in both metrics, with degradation of up to 15.9%. Although dual-scale roughness surfaces also exhibit Cassie DWC , condensation mechanisms and limited surface durability reduce condensate collection, resulting in approximately half the condensate mass collection rate compared with single-micro-scale Cassie DWC surfaces. Overall, the lower fabrication cost, simpler processing, and improved durability of single-micro-scale roughness Cassie DWC surfaces present a promising and practical alternative for scalable applications such as power generation, desalination, and thermal management. • The droplet's wetting behavior effect on condensation heat transfer is discussed. • Single-micro-scale surfaces show a + 33% in heat transfer compared to flat substrates. • Single-micro-scale surfaces balance the heat transfer and water collection efficiency. • Dual-scale surfaces can stably maintain the Cassie dropwise condensation. • Coalescence-induced jumping is only observed on dual-scale surfaces. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Heat & Mass Transfer is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=192907746
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.ijheatmasstransfer.2026.128764
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Wetting
        Type: general
      – SubjectFull: Heat transfer
        Type: general
      – SubjectFull: Hydrophobic surfaces
        Type: general
      – SubjectFull: Surface roughness
        Type: general
      – SubjectFull: Film condensation
        Type: general
    Titles:
      – TitleFull: Wetting behavior-dependent heat transfer performance during dropwise condensation on engineered hydrophobic surfaces.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Lo, Chi-Chun
      – PersonEntity:
          Name:
            NameFull: Chen, Li-Jen
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 15
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 00179310
          Numbering:
            – Type: volume
              Value: 264
          Titles:
            – TitleFull: International Journal of Heat & Mass Transfer
              Type: main
ResultId 1