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Film rupture and partial wetting over flat surfaces.

Number: pap. 2514

Author(s) : GIANNETTI N., TRINURUK P., YAMAGUCHI S., et al.

Summary

The principle of minimizing the energy of a given stream-wise section of the film is applied in order to investigate the film stability and the local variation of the wetting behavior under an imposed fluid distribution width. The evolution to the stable rivulet configuration is estimated considering the energy of the system under a Lagrangian approach. 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 to 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 mass flow rates are delivered. Finally, a first qualitative and quantitative validation of the results is presented with reference to the visual data captured on a dedicated experimental test section.

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Pages: 10

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Details

  • Original title: Film rupture and partial wetting over flat surfaces.
  • Record ID : 30024591
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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