Utilization of Low Gravity Environment for Measuring the Viscosity of Highly Viscous Liquids

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Scientific paper

The method of drop coalescence is utilized for determining the viscosity of highly undercooled liquids. Low gravity environment is necessary in order to avoid problems connected with droplet deformation due other body forces that are present under terrestrial conditions. The drop coalescence method is preferred over the drop oscillation technique since the latter method can only be applied for liquids with vanishingly small viscosities. The technique developed relies on both the highly accurate solution of the equations of motion for fluid flows as well as on data from experiments conducted in near zero gravity environment. Results are presented for method validation experiments performed recently on board the NASA/KC-135 aircraft. These experiments gave excellent results which will be discussed together with plans for implementing the method in a shuttle flight experiment

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