KEIO RESEARCHERS INFORMATION SYSTEM

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

• Ph.D., The University of British Columbia, Vancouver, Canada, Dissertation, 2019.04

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

Papers 【 Display / hide 】

Papers 【 Display / hide 】

• Viscoelastic wetting transition: beyond lubrication theory

  M Kansal, C Datt, V Bertin, JH Snoeijer

  The European Physical Journal Special Topics, 1-19  2025

  ISSN  19516355

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  The dip-coating geometry, where a solid plate is withdrawn from or plunged into a liquid pool, offers a prototypical example of wetting flows involving contact-line motion.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 2024.04

  ISSN  00221120

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  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

• 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

• Chemically-driven flows in active phase-separating systems

  C Datt, J Bauermann, F Jülicher

  Bulletin of the American Physical Society  2023

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Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• 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 2020.03

  ISSN  03770257

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  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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Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• PHYSICS OF LIVING MATTER

  2025

• INDEPENDENT STUDY ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS

  2025

• INDEPENDENT STUDIES IN MECHANICAL ENGINEERING

  2025

• GRADUATE RESEARCH ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS 2

  2025

• GRADUATE RESEARCH ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS 1

  2025

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