Dynamic Behavior of Thermistor Flowmeters

In the present paper the influence of nonlinear effects on the dynamic behavior of thermistor flowmeters is studied. The numerical solutions of the nonlinear differential equations for the problem are presented. It is shown that the linear approximation does not supply a correct evaluation of response times. On the other hand, response times are one of the most important limitations in the use of thermistors as flowmeters. An accurate evaluation of these times and the establishment of a relation between response times and the ``thermal time constant´´ are then attempted, in view of their applicative interest.