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Fluidic flowmeter - Gas flowmeter based on fluidic dynamic oscillation

Conference ·
OSTI ID:6773393
; ;
The conventional diaphragm gas flowmeters are no longer suitable to the Japanese housing conditions aesthetically and their sizes do not fit the small Japanese houses. It is under these conditions that the authors are endeavouring to develop a new gas meter of a smaller size with good installation fittingness and safety functions. This new gas meter is to detect the gas flow rate based on the principle of the fluidic oscillation in stead of the conventional displacement method. The fluidic oscillation frequency decreases as the flow rate decreases until finally the oscillation ceases when the flow rate falls under a certain value. The authors have lowered the lower limit flow rate close to the theoretical limit below which oscillation stops. Further, they have made possible the measurements in a still lower flow rate range, using the IC flow sensor which detects fluid velocities. As the result, the authors have succeeded in developing a new gas meter which has no mechanically movable parts. This gas meter is able to meter the flow rate of 3-- 3,000 iota/h at maximum pressure loss of 225 Pa (Air). Furthermore, they have reduced the electric power consumption to operate the gas meter down to the minimum, and it is estimated that one battery of a capacity of 5000 mAh (3V) would keep the meter working for 10 years.
OSTI ID:
6773393
Report Number(s):
CONF-880603-
Country of Publication:
United States
Language:
English

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03 NATURAL GAS
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47 OTHER INSTRUMENTATION
BUILDINGS
DESIGN
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRONIC EQUIPMENT
ENERGY SOURCES
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NATURAL GAS
POWER SUPPLIES
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