Liquid Viscosity Intro. To Engineering Project Team #9 Nov 02, 2004
Principle of Operation - Steven Sallee (Team Leader) The cylinder is raised and held in position.The cylinder is raised and held in position. The cylinder falls and its weight is the force of its velocity.The cylinder falls and its weight is the force of its velocity. The liquid near the surface of the cylinder has the same velocity of the cylinder and moves down.The liquid near the surface of the cylinder has the same velocity of the cylinder and moves down. The liquid near the container has the velocity in the opposite direction.The liquid near the container has the velocity in the opposite direction. Record the time between the cylinder reaching constant velocity and hitting the bottom.Record the time between the cylinder reaching constant velocity and hitting the bottom. The time of fall is directly proportional to the viscosity.The time of fall is directly proportional to the viscosity.
Mathematical approach – Jeremy Banta F/A = u V/D F = W = mg A = 2πrh U is the constant V is the velocity D = d/2 V = FD/Au Viscosity is N sec/mm 2
Material and Equipment – John Leyva Three cylinders made by aluminum, steel and iron all with r = 50 mm. One round metal container r = 51 mm. One 20x20 mm outer container. One cylinder holder with r=50.5mm One sec stopwatch, one thermometer, one ruler, one cup, 3 type of fluid: water, mercury and engine oil. Total cost estimate: $160
Test Method and Condition - John Leke Room temperature 20ºC Use 3 cylinders to test same fluid, calculate each viscosity. Average 3 viscosities and put in chart. Test all 3 fluids and compare the result in table.
Conclusion - JingWen Liu In the same test condition, engine oil has more viscosity than water and mercury. Viscosity is a measure of a fluids resistance to flow. The greater the viscosity (engine oil), the more slowly the liquid flows. The test accuracy is limited by assuming the cylinder surface condition is the same, ignoring the bottom of the cylinder resistance and measuring the resistance of the liquid being pushed out of the opening. The design is for laboratory test only. Thanks to the Norcross Corp. For production detail: www.viscosity.com