Movable Tube Mass Flowmeter (III)

SHIBA Kamekichi, DOI Koichiro, MATSUI Yoshikazu

doi:10.11470/oubutsu1932.45.1141

Movable tube mass flowmeters with two constant volume flow apparatus were reported in previous papers. The flowmeter, here reported, needs only one constant volum flow apparatus, and is accordingly superior to the previous ones. It is shown theoretically that the movable tube mass flowmeter with a single constant volume flow apparatus must satisfy the following conditions: cosθ_A/S_A=-cosθ_B/S_B=cosθ_C/S_C (1) where S_A, S_B and S_C are the crosse-sctional areas of the straight tubes A, B and C which serve for the inlet or outlet of the movable tube; θ_A, θ_B and θ_C are the angles between the outward direction of each axis of the three straight tubes and the direction of displacement of the movable tube. The fluid of constant volume flow rate flows through the tube C. In case of the following set of values of θ_A, θ_B and θ_C, the construction of the mass flowmeter becomes particularly simple: θ_A=θ_C=π, θ_B=0. (2) As with the previous flowmeters, the measuring principle of the present flowmeter is independent of Bernoulli's theorem and the mass flow rates can be calculated theoretically without having to determine the discharge coefficient experimentally. Experiments were carried out by using two kinds of trial flowmeter of the above mentioned construction and the experimental results agree fairly well with the theory.

Movable Tube Mass Flowmeter (III)

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