Abstract
This paper describes a new device for measuring the flow rate in a pipeline. The device has a bow-shaped constrictor similar to a segmental orifice. Experiments were carried out for three opening area ratios from 0.50 to 0.75 and over the range of the diametral Reynolds number of Re=(1.5∼15)×104. The results are summarized as follows: (1) It is recommended that the pressure tappings be located (0∼0.25)d upstream of and (0.25∼1.0)d downstream of the constrictor, respectively. (2) The curves of the discharge coefficient are shown to be flat for Re=(2.2∼5.0)×104. Compared with pipe orifices of the same opening area ratio, the critical Reynolds numbers of this flowmeter are found to be reduced to one-eighth of those of the orifice.
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