Temperature gradients and flow-meter performance

- Sep 27, 2018 -

A quantitative treatment of the influence of radial temperature gradients on flow-meter performance is described for the first time. It is shown that large flow-meter errors can be induced due to temperature gradients in the case of fundamental mode propagation (several percentage error values are possible using typical parameter values for water as medium at low flow values corresponding to laminar parabolic flow profiles). It is also found that decreasing the cylinder radius or ultrasound frequency are effective ways to diminish the influence of temperature gradients on flow-meter performance besides the obvious choice of reducing temperature gradients by thermal insulation of the flow-meter tubes and connecting tubes.