オリフィスを用いる差圧式質量流量計

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タイトル別名
  • Differential Pressures Type Mass Flowmeter with Orifices
  • オリフィス オ モチイル サアツシキ シツリョウ リュウリョウケイ

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Differential pressures type mass flowmeters, here reported, consist of a constant flow apparatus and 3 or 2 orifice meters. These components compose a kind of hydraulic calculating circuit.<br>In this paper, measuring principles of them are derived by the use of Bernoulli's theorem. Equations expressing these measuring principles are as follows:<br>ρQ=k3(ΔpA-ΔpB+ΔpC), ρQ=k2√ΔpAΔpC, where ρQ is mass flow rate, ΔpA, ΔpB, ΔpC are differential pressures produced by orifice A, B, C and k3, k2 are meter constants. Mass flow rates can be obtained by measuring 3 or 2 differential pressures.<br>The two kinds of differential pressures type mass flowmeters are produced by way of trial. Relationships given by the above equations are confirmed by experiments carried out with the trial mass flowmeters.<br>Constants k3 and k2 must be determined experimentally as they include discharge coefficients.

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