A Novel Technique to Measure the Magnitude and Direction of Flow in a Tube

[+] Author and Article Information
Allen L. Robinson

Department of Mechanical Engineering and Department of Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, PA 15213

Richard G. Sextro

Energy and Environment Division, E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720

J. Fluids Eng 122(1), 186-188 (Nov 30, 1999) (3 pages) doi:10.1115/1.483249 History: Received June 01, 1999; Revised November 30, 1999
Copyright © 2000 by ASME
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Robinson,  A. L., and Sextro,  R. G., 1997, “Radon Entry into Buildings Driven by Atmospheric Pressure Fluctuations,” Environ. Sci. Technol., 31, pp. 1742–1748.
Robinson,  A. L., Sextro,  R. G., and Fisk,  W. J., 1997, “Soil-Gas Entry Into an Experimental Basement Driven by Atmospheric Pressure Fluctuations—Measurements, Spectral Analysis, and Model Comparison,” Atmos. Environ., 31, pp. 1477–1485.
Tewari,  S. S., and Jaluria,  Y., 1990, “Calibration of Constant-Temperature Hot-Wire Anemometers for Very Low Velocities in Air,” Rev. Sci. Instrum., 61, pp. 3834–3845.
Chen, T. S., and Armaly, B. F., 1987, “Mixed Convection in External Flow,” Handbook of Single-Phase Convective Heat Transfer, S. Kakaç, R. K. Shah, and W. Aung, eds. Wiley, NY, pp. 14-1–14-35.


Grahic Jump Location
Schematic of flow sensor. The sensing element of each air velocity transducer is mounted along the centerline of the tube. The U-shaped tube used for the radon entry study was 1.9 cm in diameter and 40 cm tall. The figure is not drawn to-scale.
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(a) Predictions of the heat transfer rate from a 3.175-mm-diameter spherical sensing element of an omnidirectional hot-film velocity transducer (TSI model 8470) as a function of velocity. (b) Difference between the predicted heat transfer rate from the sensing element in an upward and a downward flow. An upward flow is in the opposite direction to gravity; a downward flow is in the same direction as gravity.
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(a) Calibration curves for the flow sensor developed for the radon entry study. (b) Difference in the velocity reported by the hot-wire anemometers. The upward hot-wire is in the leg of the U-shaped tube in which the flow is in the opposite direction to gravity; the downward hot-wire is in the leg of the U-shaped tube in which the flow is in the same direction as gravity. As described in the text, the velocity measured by the upward transducers is used to determine the flow rate through the tube. Note: the specific velocity versus flow rate relationship shown in this figure is for the sensor developed for the radon entry study.
Grahic Jump Location
Comparison between flow from an oscillating flow source to that measured by the flow sensor




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