Constant temperature gradient fluid mass flow transducer

Details Constant temperature gradient fluid mass flow transducer Constant temperature gradient fluid mass flow transducer

1991-04-17

1992-09-01

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

051429071

ABSTRACT:
A constant temperature gradient fluid mass flow transducer is described. The upstream and downstream ends of a measuring section of a capillary tube of the transducer are held at respective constant temperatures by separate temperature regulated heat sinks, the downstream end being hotter. A heat conducting outer tube surrounds the measuring section and joins the heat sinks to cause the measuring section temperature to assume a substantially linear profile at a constant gradient. An electrical heater supplies heat uniformly to the measuring section to replace that transferred to the flowing fluid within the capillary tube and thereby keep the temperature and gradient constant. The voltage across the heater, proportional to the square root of mass flow rate, is taken as the output signal.

REFERENCES:
patent: 3851526 (1974-12-01), Drexel
patent: 4016759 (1977-04-01), Baker et al.
patent: 4464932 (1984-08-01), Ewing et al.
patent: 4548075 (1985-10-01), Mariano
"A Flow Method for Comparing the Specific Heats of Gases"; Proc. R. Soc. London; A 126; pp. 319-354.

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