A model for detachment of a partially wetting drop from a solid surface by shear flow

Suddhasatwa Basu, K. Nandakumar, Jacob H. Masliyah*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

Liquid drop detachment from a solid surface by simple sheat flow is modeled based on the experimental observations available in the literature. A liquid drop adhered to a solid surface deforms in the presence of a simple shear flew to form an advancing and a receding dynamic contact angle, The drop slides on the solid surface when the drag due to the shearing fluid overcomes the retentive force due to the contact angle hysteresis. A drop having an equilibrium contact angle, θ(e), approaching 180°detaches from the solid surface at the onset of its sliding motion. However, a drop with θ(e) much lower than 180°slides on the solid surface and will not detach. With further increase in the sheer rate, the sliding drop detaches from the solid surface when the lift force equals the adhesive, gravitational, and buoyancy forces of the drop. Based on this premise, an approximate mathematical model for the detachment of a partially wetting drop is constructed. The experimental results available in the literature for Pristane and Squalane drop detachment are compared for slide and lift as the mode of detachment. The critical sheat rate for the detachment of Pristane drops, having θ(e), of 175°, is predicted well by the model where sliding as the mode of detachment is assumed, whereas the experimental data for Squalane drops, having θ(e), of 126°, is well predicted by the model where lift is considered the mode of detachment.

Original languageEnglish
Pages (from-to)253-257
Number of pages5
JournalJournal of Colloid and Interface Science
Volume190
Issue number1
DOIs
StatePublished - 1 Jun 1997
Externally publishedYes

Keywords

  • Adhesive force
  • Advancing and receding dynamic contact angles
  • Contact angle hysteresis
  • Drop detachment
  • Lift force
  • Partially wetting drop
  • Sliding drop
  • Steady shear flow

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