慶應義塾研究者情報データベース

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• Ph.D., The University of British Columbia, Vancouver, Canada, 論文, 2019年04月

  Dynamics of small particles, passive and active, in complex fluids

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• Viscoelastic wetting transition: beyond lubrication theory

  Kansal M., Datt C., Bertin V., Snoeijer J.H.

  European Physical Journal Special Topics 2025年

  ISSN  19516355

  　概要を見る

  The dip-coating geometry, where a solid plate is withdrawn from or plunged into a liquid pool, offers a prototypical example of wetting flows involving contact-line motion. Such flows are commonly studied using the lubrication approximation approach which is intrinsically limited to small interface slopes and thus small contact angles. Flows for arbitrary contact angles, however, can be studied using a generalized lubrication theory that builds upon viscous corner flow solutions. Here we derive this generalized lubrication theory for viscoelastic liquids that exhibit normal stress effects and are modelled using the second-order fluid model. We apply our theory to advancing and receding contact lines in the dip-coating geometry, highlighting the influence of viscoelastic normal stresses for contact line motion at arbitrary contact angle.

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• Viscoelastic wetting: Cox-Voinov theory with normal stress effects

  Kansal M., Bertin V., Datt C., Eggers J., Snoeijer J.H.

  Journal of Fluid Mechanics 985 2024年04月

  ISSN  00221120

  　概要を見る

  The classical Cox-Voinov theory of contact line motion provides a relation between the macroscopically observable contact angle, and the microscopic wetting angle as a function of contact-line velocity. Here, we investigate how viscoelasticity, specifically the normal stress effect, modifies the wetting dynamics. Using the thin film equation for the second-order fluid, it is found that the normal stress effect is dominant at small scales yet can significantly affect macroscopic motion. We show that the effect can be incorporated in the Cox-Voinov theory through an apparent microscopic angle, which differs from the true microscopic angle. The theory is applied to the classical problems of drop spreading and dip coating, which shows how normal stress facilitates (inhibits) the motion of advancing (receding) contact lines. For rapid advancing motion, the apparent microscopic angle can tend to zero, in which case the dynamics is described by a regime that was already anticipated in Boudaoud (Eur. Phys. J. E, vol. 22, 2007, pp. 107-109).

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• Viscoelastic wetting: Cox–Voinov theory with normal stress effects

  M Kansal, V Bertin, C Datt, J Eggers, JH Snoeijer

  Journal of fluid mechanics 985, A17 2024年

• Viscoelastic drop spreading: Cox-Voinov theory with normal stress effects

  M Kansal, V Bertin, C Datt, J Eggers, J Snoeijer

  Bulletin of the American Physical Society 2023年

• Chemically-driven flows in active phase-separating systems

  C Datt, J Bauermann, F Jülicher

  Bulletin of the American Physical Society 2023年

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• Corrigendum to “A note on higher-order perturbative corrections to squirming speed in weakly viscoelastic fluids” (Journal of Non-Newtonian Fluid Mechanics (2019) 270 (51–55), (S0377025719301004), (10.1016/j.jnnfm.2019.06.009))

  Datt C., Elfring G.

  Journal of Non Newtonian Fluid Mechanics 277 2020年03月

  ISSN  03770257

  　概要を見る

  The [Formula presented] correction to the swimming speed in a Giesekus fluid (equation 3.3) in the aforementioned article was reported incorrectly. The corrected equation is [Formula presented] Subsequently, equations 3.4 and 3.5 in the article should respectively be [Formula presented] [Formula presented] The coefficient of De³ in these two equations was previously reported as −2.62 and +2.62, respectively. These changes will also reflect in figure 1 of the original manuscript which on correction becomes [Formula presented] The error does not change the message and conclusion of the article. We regret any inconvenience this may have caused. We thank Professor Kostas D. Housiadas for pointing out the error.

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• ＰＨＹＳＩＣＳ　ＯＦ　ＬＩＶＩＮＧ　ＭＡＴＴＥＲ

  2025年度

• 開放環境科学課題研究

  2025年度

• 機械工学創造演習

  2025年度

• 開放環境科学特別研究第２

  2025年度

• 開放環境科学特別研究第１

  2025年度

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