A Micropump Driven by Marangoni Effect

Thermally driven Marangoni surfers

Precision Marangoni-driven patterning.

A Marangoni flow is shown to occur when a polymer film possessing a spatially-defined surface energy pattern is heated above its glass transition to the liquid state. This can be harnessed to rapidly manufacture polymer films possessing prescribed height profiles. To quantify and verify this phenomenon, a model is described here which accurately predicts the formation, growth, and eventual diss...

A Resonantly-Driven Piezoelectric Micropump for Microfactory

For realization of micro fluid power sources applicable to microfactory or micromachines using fluid power with high power density, a resonantly-driven piezoelectric micropump with newly devised check valve unit is developed and a practical application to micro press is attempted. First, a micro sheet valve having a floating valve-body inside valve chest to increase valve-opening and to decreas...

Bursting of Dilute Emulsion-Based Liquid Sheets Driven by a Marangoni Effect.

We study the destabilization mechanism of thin liquid sheets expanding in air and show that dilute oil-in-water emulsion-based sheets disintegrate through the nucleation and growth of holes that perforate the sheet. The velocity and thickness fields of the sheet outside the holes are not perturbed by holes, and hole opening follows the Taylor-Culick law. We find that a prehole, which widens and...

Structure of Marangoni-driven singularities

This work presents an analytical study of the structure of steady Marangoni-driven singularities in the context of chemical-reaction driven tip-streaming, which identifies the conditions when such singularities are observable. As motivated by experimental observations of the conical symmetry of the problem, one can construct self-similar solutions of the Stokes equations, which are singular at ...