A vortex shedding bluff body for generating vortices in a fluid flowing through a passageway within which the bluff body is supported. The bluff body extends only partially across the width of the passageway such that a significant proportion of the fluid flow occurs between the free end of the bluff body and the side of the passageway towards which the bluff body extends. A relatively short bluff body extending for example only one fifth of the way across a passageway can generate vortices the characteristics of which enable an accurate measurement of the fluid flow rate to be derived. This means that the introduction of a vortex shedding bluff body need not significantly reduce the carrying capacity of the pipe into which it is introduced.
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