Apparatus and method for measuring fluid flow over a wide range

Details Apparatus and method for measuring fluid flow over a wide range Apparatus and method for measuring fluid flow over a wide range

1974-03-28

1976-03-23

Gill, James J.

Measuring and testing

Volume or rate of flow

Expansible chamber

23515134, G01F 112

Patent

active

039452530

ABSTRACT:
Flowmeter apparatus and method for obtaining accurate measurement of fluid flow, not only in the turbulent flow range, but also in the laminar and transitional flow ranges by compensation of the meter reading. The meter reading is also compensated for change in viscosity of the fluid flowing through the meter. The compensation for flow range is based on the best-fit straight line approach obtained by matching straight line segments to the quantity versus frequency output curve throughout the laminar and transitional ranges, and compensating the flowmeter reading in accordance with the shape of the straight line segments. The compensation for change in kinematic viscosity of the fluid is added to the flowmeter output in accordance with the temperature-viscosity relationship for the fluid and in accordance with a ratio of compensation factors between the actual fluid and a reference fluid.

REFERENCES:
patent: 3355947 (1967-12-01), Karlby et al.
patent: 3699318 (1972-10-01), Underkoffler et al.
patent: 3700865 (1972-10-01), Ley
patent: 3756079 (1973-09-01), November
"Electronic Measurement of Respiratory Flow Velocity," by Nakajima et al., from "Digest of the 7th International Conference on Medical & Biological Engineering," 8-67, (Stockholm, Sweden).

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