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Accession Number:
AD0623278
Title:
VELOCITY MEASUREMENTS IN A VISCOUS FLUID WITH A HOT-WIRE ANEMOMETER,
Corporate Author:
NAVY UNDERWATER SOUND LAB NEW LONDON CONN
Report Date:
1965-10-05
Abstract:
The measurement of small velocities in a highly viscous fluid is impractical if standard static-impact tube methods are employed. Fluid resistance to flow is great and, consequently, measurements with a static-impact system are too time-consuming to be useful. Since a system requiring fluid movement through a constricted passage could not be employed, velocity measurements were made with a hot-wire anemometer. The investigation of the problems involved and the techniques developed in adapting the hot-wire anemometer for these velocity measurements are the subjects of the report. The hotwire sensing element was successfully calibrated by use of a current difference technique. This calibration curve was used to measure seven velocity profiles, and the resulting profiles are thoroughly discussed. The report includes a discussion of the effects of hot-wire sensing element geometry end conduction heat loss from the hot-wire sensing element radial temperature gradient at the test section and the effect of the hot-wire probe on the measurements under certain conditions. Recommendations are made for the design of an improved hot-wire probe and an improved hot-wire sensing element positioning device together with a recommended technique for the extensions of the calibration curve. Author
Pages:
0041
File Size:
0.00MB
