Surface-wettability-induced sliding bubble dynamics and its effects on convective heat transfer

Jonghyun Kim, Joon Sang Lee

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

To explore the effects of wettability on heat transfer in sliding bubble dynamics, we investigated how the dynamics of sliding bubbles and heat transfer over a heated surface depend on the degree of wettability. We used volume-of-fluid scheme to track the interface of the dispersed phase via the local volume fraction. The results of the numerical model used in this study were consistent with those of experimental studies. After bubble collision, the bubble was found to adhere to a heated hydrophobic surface, as the bubble impinged upon the surface. The heat-transfer coefficient increased significantly in the region of the hydrophobic surface where the adhered bubble passed. The bubble completely adhered to the surface, as the adhesion force continuously increased. When the contact angle increased in the surface-contact regime (above 110°), the bubble spread out over the surface. The average Nusselt number in the surface-contact regime was found to be greater than that in other regimes (below 110°); thus, the surface more strongly affected heat transfer.

Original languageEnglish
Pages (from-to)639-652
Number of pages14
JournalApplied Thermal Engineering
Volume113
DOIs
Publication statusPublished - 2017 Feb 25

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Wetting
Heat transfer
Nusselt number
Contacts (fluid mechanics)
Heat transfer coefficients
Contact angle
Numerical models
Volume fraction
Adhesion
Fluids

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

Cite this

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abstract = "To explore the effects of wettability on heat transfer in sliding bubble dynamics, we investigated how the dynamics of sliding bubbles and heat transfer over a heated surface depend on the degree of wettability. We used volume-of-fluid scheme to track the interface of the dispersed phase via the local volume fraction. The results of the numerical model used in this study were consistent with those of experimental studies. After bubble collision, the bubble was found to adhere to a heated hydrophobic surface, as the bubble impinged upon the surface. The heat-transfer coefficient increased significantly in the region of the hydrophobic surface where the adhered bubble passed. The bubble completely adhered to the surface, as the adhesion force continuously increased. When the contact angle increased in the surface-contact regime (above 110°), the bubble spread out over the surface. The average Nusselt number in the surface-contact regime was found to be greater than that in other regimes (below 110°); thus, the surface more strongly affected heat transfer.",
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Surface-wettability-induced sliding bubble dynamics and its effects on convective heat transfer. / Kim, Jonghyun; Lee, Joon Sang.

In: Applied Thermal Engineering, Vol. 113, 25.02.2017, p. 639-652.

Research output: Contribution to journalArticle

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