Film rupture and partial wetting over flat surfaces with variable distributor width

Niccolo Giannetti*, Piyatida Trinuruk, Seiichi Yamaguchi, Kiyoshi Saito

*この研究の対応する著者

研究成果査読

1 被引用数 (Scopus)

抄録

The effect of film stability and wetting behavior under an imposed fluid distribution width on falling film transfer devices for thermal engineering systems are investigated with reference to a variational thermodynamic formulation. The principle of minimizing the energy of a given streamwise section of the film is applied to identify the stable condition as the most likely among the set of possible flow configurations. The evolution toward this stable condition is estimated while adopting a Lagrangian viewpoint. The Lagrange equation is written with reference to a single generalized wetting coordinate and its time derivative, under the effect of Rayleigh's dissipation function and a generalized force associated with a scalar potential defined as the energy excess with respect to the local energy minimum of the stable rivulet configuration. This methodology is extended to include the hysteresis behavior of the contact angle and wettability hysteresis when increasing or decreasing the mass flow rates. Finally, a qualitative and quantitative validation of the results is presented with reference to the visual data captured on a dedicated experimental test section.

本文言語English
ページ(範囲)1313-1324
ページ数12
ジャーナルScience and Technology for the Built Environment
25
10
DOI
出版ステータスPublished - 2019 11 26

ASJC Scopus subject areas

  • 環境工学
  • 建築および建設
  • 流体および伝熱

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