Measurement of the Liquid Entrainment by a Hot-wire Method

Abstract

The use of a constant-temperature hot wire anemometer to measure droplet size is discussed.
Heat loss caused by a droplet hitting on hot wire is a function of droplet size. The electric pulse corresponded to droplet properties is overlapped on the heat compensation current which maintain hot wire temperature. The size analysis of pulses give the droplet size analysis of entrainment. The pulses were amplified, sorted by a discriminator circuit, and counted.
The results show that the hot wire method is effective to detect droplet in flow, and counting data show the droplet size distribution of liquid entrainment relatively.