An experimental analysis of an annular-averaging flow sensor

Modem engineering practice and research frequently require the measurement of a fluid velocity at a given point in a flow field. In most industry, the average flow velocity of any fluid is required, as accurate as possible, to obtain flow rate. Devices such as nozzles, venturi tube, etc. have been used for this purpose. Recently, there has been a velocity-head sensor known as the Annubar primary sensor which measures the average velocity of flow directly. It has been used by some industry due to its simplicity in installation. The present report is an attempt to study the characteristics of the Annubar flow sensor by way of experimentation. As the design of the Annubar employs the same principle as the pitot tube, a state-of-the-art in the measurement of fluid flow by pitot tube and the related pipe flow theory are given.