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Summary Videos

Viscous resistance in drop coalescence

Viscous resistance in drop coalescence

Hydrodynamic interactions. With the help of experiment, theory and computer simulation, colloidal dynamic structure formation near a solid surface has been evaluated. Simulation is provided based on physical intuition, approximation and simplified models while avoiding complex mathematical formulation. [Actual presentation starts at 1:52]

Drop coalescence. From the experiments of 2D and 3D coalescence along with theoretical scaling law analysis, we have shown that fluid flow (for unbounded coalescence) in the bulk drops are inertial, the dominant resistance occurs through a viscous effect in the merging interface region and at the lesser extent in the bridge region.

Drop coalescence

Two-dimensional coalescence

Two-dimensional coalescence

Unequal laplace pressure and marangoni effect

Unequal laplace pressure and marangoni effect

Sandwiched coalescence. Similar sized drops from same liquid forms non-invasive merging interface when they are coalesced between two sandwiched glass surfaces.

Unequal Laplace pressure and Marangoni effect. Drop on the right side is added with surfactant while left drop is unchanged meaning its surface tension is higher compared to the right drop. Therefore, left drop has higher Laplace pressure than the right drop. Pressure from left bulk drop to the bridge region is higher than that of the right drop. Therefore, a liquid column is formed. In the later dynamics, Marangoni effect on the surface plays a role and thus manifests surface driven flow along with pressure driven flow from the early dynamics.

hydrodynamic interactions: Simulation

Non-overlapping colloid particle generaion using MATLAB

Non-overlapping colloid particle generaion using MATLAB

vortex like structure growth near a solid surface when colloids are subjected to rotational gravity forces

vortex like structure growth near a solid surface when colloids are subjected to rotational gravity forces

Role of membrane tension in virus fusion

We presented a hypothesis that can explain temperature dependent virus replication process. Knowing the proteins envolvement in virus fusion may not enough. Membrane tension can play a role. Moderately cold and dry air is favorable for virus replication. 

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