Temperature Independent Fluidic Resistive Circuits and Concepts
Tadeusz M. Drzewiecki · Journal of Dynamic Systems Measurement and Control · 1984
This paper discusses series and parallel topologies of orifices and capillaries as fluidic resistors and the way that they relate to temperature sensitivity and temperature compensation. Examination of a laminar flow nozzle, as typically found in a laminar proportional amplifier (LPA), shows that it may be represented by a parallel combination of an orifice and a capillary. As a result a nozzle has inherent temperature insensitive properties that allow temperature independent operation of such laminar fluidic devices as pressure controlled oscillators. It is shown that one may design a constant resistance, within ±0.1 percent, for changes in environmental temperature of ±20°C when air is the working fluid.