Experimental Devices for Measuring Small Gas Flows

Abstract

In this paper, the authors present the design of an experimental device for measuring small flow rates of gaseous media. For the design and construction, materials were used to create a local pressure resistance and thus allow the pressure gradient to be measured upstream and downstream of the measuring element. The proposed measuring devices can serve as an alternative to actual measuring devices for detecting the instantaneous quantity flowing in the measuring assembly. The results obtained from the experimental measurements are used to determine the characteristics of the proposed measuring elements. The aim is to establish dependencies that will serve for the use of the proposed measuring elements for research and educational purposes.

Experimental Device for the Measurement of Small Gas Flows Utiliying the Principle of Lamilar Flow Elements

“…Comparing the alternative models already developed and described in [13], the final result is the determination of the flow rate based on the pressure drop across the measuring element. In this case, the created model device also produces a pressure loss, which is also the basis for determining the correct value of the flow rate.…”

“…The aim was to create a simple device based on the principle of a commercially produced Laminar flow element from available alternative materials. The fabricated device, as in [13], could be used for educational purposes as well as for non-commercial measurements.…”

“…For the calibration of the airflow measurement device a volume flow meter type G4 BK was used, whose measuring range is for the value of the maximum permissible flow rate Qmax = 6 m 3 .h -1 and the minimum value of the flow rate Qmin = 0.016 m 3 .h -1 . The maximum inlet pressure that can be measured on this device is pmax = 20 kPa [13].…”

“…The design of the flow measurement model is a continuation of the designs of such alternative devices that were described in [13]. The developed model was in the order of No.3.…”

“…Figure13 Dependence of the air flow rate on the change of the pressure difference at the measuring element -Natural gas.…”