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ABSTRACT - Rotating shaft viscometer applied a fixed...

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ABSTRACT In this experiment our aim is to find viscosity of aqueous glycerol solution at different glycerol concentrations and temperatures. We applied 3 methods which are capillary flow method, falling ball method and rotating shaft method. In capillary flow method we measured the time needed to flow of a given liquid with driving force which is hydrostatic head of the test liquid. Our equipment is Ostwald glass capillary viscometer which is a tube has an upper and lower bulb in order to store liquid in it. In falling ball method we found the time necessary to fall of a spherical ball through a test liquid between fixed two Marks. We used tube which has a guide tube in order to let ball to go in. As a third method rotating shaft method is studied.
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Unformatted text preview: Rotating shaft viscometer applied a fixed angular velocity to the fluid and the torque required to produce a given angular velocity is a measure of viscosity. At capillary flow method we found viscosities of 45.6 (W/W) % glycerol solutions are 1.778 cP, 1.192cP and 0.838cP at 303K, 323K and 343K. In falling ball method we calculated the viscosities of glycerol solution which are 22.3(W/W) %, 45.6 (W/W) % and 65.6(W/W) % are 2.04cP, 3.16cP and 8.83cP at 298k. Finally with rotating shaft viscometer we observed the viscosity of 45.6 (W/W) % of glycerol solution as 4.17cP at 298K. We concluded that viscosity of aqueous glycerol solution increases with increasing of percentage of glycerol in solution and also decreases with increasing temperature....
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