Carl Ussery Justin Wilson Biju Shrestha Jeremy Thompson. Measurement of Viscosity.
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The FSV (Falling Sphere Viscometer) consists of a large glass tube which is filled with water. A smaller glass tube which is marked at two distances by the help of rubber bands is positioned in the large glass tube and is filled with the testing fluid. A funnel is placed on the top of the smaller tube. A thermometer is placed inside the larger tube to measure the temperature of water. The purpose of the water is to keep the system constant in temperature. A stir rod is placed in the water to aid this process. The funnel is used to guide the ball bearing into the smaller tube.Description
Let us assume that we know the value of variables g, a, v, and delta p except for terminal velocity v. To calculate the velocity v we use the FSV and the following procedures.
The velocity of the ball bearing is calculated from the measured distance between two marks of the rubber bands and the time taken by the ball bearing to travel between the two rubber band marks. Then from Stoke’s Law, we can calculate the viscosity.
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