Thermal sensor of flow reversal

Author: J. Kiełbasa

The papre presents a modified theoretical description of the sensor detecting flow velocity reversal.

The sensor is made of two hot, parallel wires little apart, so they can interest with one another. They lie one behind the other in the plane parallel to flow velocity.

The wires are normal to the velocity vector (Fig. 1). The two wires, connected in series, are supplied from one CTA system, which means that the present sum of wire resistances remains constant.

Voltage difference across the wires is the measured parameter.

Theoretical considerations lead us to the conclusion than the probe is maximally sensitive to velocities nearing zero while probe sensitivity is proportional to the distance between the wires.