Figure 1: Graphic Summary of the Study (IMAGE)
Caption
As indicated by the dark red arrows, fluid flowing through a narrow cylindrical pipe moves at different speeds: faster near the center of the tube than at the edges (Poiseuille flow). The layer in contact with the internal surface of the pipe is known as slip layer or depletion layer, and allows the bulk fluid to 'slip' past the walls more efficiently. The IBS team developed a new technique (STED-anisotropy) to experimentally measure what happens directly at the slip layer, and characterized changes to the depletion layer dimension and composition as a function of flow rate. Careful analysis of polymer relaxation times shows that above a critical flow rate, shear forces lead to the elongation and alignment of the polymer (chain with white beads) along the direction parallel to the flow.
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IBS
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