Measuring and testing – Volume or rate of flow – Thermal type
Patent
1985-08-15
1987-09-08
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
046915664
ABSTRACT:
An immersion-type thermal fluid flow sensor is disclosed in which the temperature dependent sensing resistor means is carried from a flexible ribbon-shaped septum immersed in the flow and arranged in a spiral, meander or other geometrical configuration to partition the total flow passageway into a plurality of parallel flow portions. In one embodiment, the partitioned flow passageways are dimensioned to have a length to cross-sectional dimension ratio for providing laminar flow conditions over the operating flow range of interest. In another embodiment, a heater is provided for heating the septum to a temperature near that of the sensing resistor to reduce the time constant of the flow measurement. In another embodiment, a thermal loading element is coupled in heat exchanging relation with the sensing resistors for increasing the critical flow rate and thus for increasing the operating range of the flow regime wherein the temperature difference .DELTA.T between the upstream and downstream resistors is a direct function of mass flow rate. Also, in another embodiment, thermal gradient shields shield the flow sensing resistors from external thermal gradients.
REFERENCES:
patent: 1487356 (1924-03-01), Packard
patent: 3754201 (1973-08-01), Adams
patent: 3931736 (1976-01-01), Olmstead
patent: 3992940 (1976-11-01), Platzer, Jr.
patent: 4214478 (1980-07-01), Lauterbach
patent: 4338814 (1982-07-01), Romann
patent: 4345465 (1982-08-01), Gruner et al.
patent: 4397179 (1983-08-01), Romann
patent: 4403506 (1983-09-01), Lauterbach
patent: 4498337 (1985-02-01), Gruner
patent: 4502339 (1985-03-01), Horn
patent: 4542650 (1985-09-01), Renken et al.
Aine Harry E.
Goldstein Herbert
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