A Device for Measuring Very Low Pressure Differences

[+] Author and Article Information
Takeo Nakagawa

Department of Civil Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464 Japan

J. Fluids Eng 102(4), 499-501 (Dec 01, 1980) (3 pages) doi:10.1115/1.3240733 History: Received February 09, 1979; Online October 26, 2009


A new technique is proposed for measuring very low pressure differences between two points in a fluid. The device combines an optical velocity measurement with the Hagen-Poiseuille relation to infer the pressure drop. A prototype model has been constructed which measures pressure differences in the range 3.07×10−5 to 1.59×10−3 cm H2 O. The estimated uncertainty of this technique is approximately 4 percent. However, no accurate, independent calibration of this device has yet been achieved.

Copyright © 1980 by ASME
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