a body (11) for forming a vortex flow with improved short length downstream, for example 0.3 cm, while being capable of performing excellent measures of the flow.the elongated body includes a thin plate (19) which extends above and across the inner diameter of a pipe, and one or more downstream sections (21).in general, these sections are in the form of a cylindrical rod with multiple sections, with their longitudinal axes parallel to the plate.the sections can be separated from the plate, or rigidly fixed to the downstream side.at the same time, the relationship between in width (cm) of the thin plate, and the width of the downstream sections (ht) in the range of 1.0 to 2.2.and the relation between the width of the thin plate, and the diameter of the pipe in the range between 0.1 and 0.3, the linearity of the signal is improved.the result is a set of flow profile close to occupies the same space as a conventional orifice plate.
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