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The physical mechanism of the oriented shift and inverse of eccentricglobules in a modest extensional flow are investigated in this paper. Throughthis work, a shift of the globule, which is driven mainly by the asymmetricinterfacial curvature, not by the outer drag, is disclosed. The asymmetriclayout of the daughter droplet leads to the asymmetric drags from thecontinuous phase and the asymmetric deformation of the globule with differentinterface curvatures. As the inner droplet has both enhancing and suppressingeffect on the globule deformation, the interface curvatures will vary whenchanging the relative size and location of the inner droplet. This curvaturedifference results in the asymmetric pressure distribution and circulationinside the globule. Eventually, the interaction of the inner driving force(pressure differences) and the outer drags causes the oriented shift andinverse of the globule. The shift direction is affected not only by thestructural asymmetry parameter (eccentricity), but also by some flow featuressuch as the capillary number. The results obtained here might enlightenpotential applications for the movement of soft globules driven by curvaturedifferences.

Effects of internal asymmetry on interface curvatures and outer drags determining the oriented shift of the eccentric globules