ERIC Number: EJ910002
Record Type: Journal
Publication Date: 2004-Nov
Abstractor: As Provided
Reference Count: 7
Peters, Randall D.
Science & Education, v13 n7-8 p641-652 Nov 2004
In these studies, a vegetable can containing fluid was swung as a pendulum by supporting its end-lips with a pair of knife edges. The motion was measured with a capacitive sensor and the logarithmic decrement in free decay was estimated from computer-collected records. Measurements performed with nine different homogeneous liquids, distributed through six decades in the viscosity[eta], showed that the damping of the system is dominated by [eta] rather than external forces from air or the knife edges. The log decrement was found to be maximum (0.28) in the vicinity of [eta] = 0.7 Pa s and fell off more than 15 fold(below 2 x 10[superscript -2]) for both small viscosity([eta] less than 1 x 10[superscript -3] Pa s) and also for large viscosity ([eta] greater than 1 x 10[superscript 3] Pa s). A simple model has been formulated, which yields reasonable agreement between theory and experiment by approximating the relative rotation of can and liquid.
Descriptors: Visualization, Laboratory Equipment, Scientific Concepts, Computer Uses in Education, Data Collection, Measurement, Models
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
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