5441337446
M. Lazar et al.
Designing Low Gas Flow Meters Based on the Calometric Principle...
Theoretical correction factor represents the ratio of the temperaturę difference calculated by the program ANSYS CFX and the temperaturę difference expressed by the eąuation.
By combining the theoretical correction coefficient with eąuation (3), a finał eąuation for calculating the actual flow of nitrogen qv is obtained
q, -^2,3016+0,1072ltif U'! U U’1 [ \pcAT)\ pc-AT
(n>V) (5)
This eąuation is based on simulation calculation and its validity must be verified by experimental measurements.
Another important aspect was to place the thermocouples in the considerably steady temperaturę field. The thermocouples of K type with wire diameter of 0.013 mm were designed. They were reinforced with pertinax pillars with cross-section of 1 mm2.
Two triples of anti-serially connected thermocouples (Fig.6) to eliminate measuring of the comparative temperaturę with simultaneous elimination of thermoelectric voltage between metals Chrome! - Alumel at placing these joints in the tight closeness at the same temperaturę 7’slirr0UI,dM1{,.
The resultant measured voltage was three times higher and simultaneously represented by average temperaturę along the cross-section.
Thermocouple - K type
Figurę 6. Connection of K type thermocouples Slika 6. Prikljućak termoparova tipa K
EXPERIMENT
Unfortunately, the relationship
between the flow ratę and temperaturę difference is morę complex and the precise relationship should be determined
experimentally for different fluids. For morę details on boundary layer thermal sensors, readers are referred to Meijer and van
Herwaarden (1994) [1], Preliminary
calibration of the gas flow meter was complete in laboratory conditions. At the steady temperaturę difference of T= 5 K, the measurement were madę at different flow rates of nitrogen. Calibration was based on measuring the volume of gas passed through TC per unit time.
The Holistic Approach to Environment 1(2011)4,153-162 Page 159
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