Obstacle assembly for vortex-type flowmeter

A vortex-type flowmeter in which a fluid to be metered is conducted through a flow tube of relatively small diameter having a obstacle assembly therein to cause vortex shedding at a frequency which is a function of flow rate, said assembly including a block fixedly mounted across the tube at right angles to the direction of flow, the block having a flat front face which is presented to the incoming fluid and a flat rear face parallel thereto which is spaced from the front face by a distance equal to the height of the front face, the block having upper and lower side surfaces with bevelled rear corners connecting the side surfaces to the flat rear face, the bevelled rear corners occupying a rear zone which lies in a zone about one-third the distance between the rear of the front faces of the block, the resultant block configuration acting to enhance the shedding characteristics of the assembly and to produce substantially linear flow rate measurements at low Reynolds numbers.