Droplet Entrainment Analysis in a Flash Evaporator with an Image‐Based Measurement Technique

Abstract

Local droplet sizes and volumes of entrained liquid are captured with an image-based measurement technique for comparison with a conventional, integral method for entrainment analysis. Experiments in a forced circulation flash evaporation were performed for different operating conditions and with two different chemical systems. Droplet size and frequency rise with an increase in thermal energy input. The local readings confirm the trends found by the integral measurement method. The modification of the image-based probe enables the detection of small ( 10 mm) and at the same time fast droplets under challenging operating conditions, such as vacuum and superheated feed similar to industrial process conditions.

Experimental Investigation and Modelling of the Droplet Size in a DN300 Stirred Vessel at High Disperse Phase Content Using a Telecentric Shadowgraphic Probe

“…Herein 𝐸 𝑘𝑖𝑛 is the turbulent kinetic energy and 𝐸 𝜎 is the surface energy, with the density of the continuous phase 𝜌 𝑑 , the mean relative velocity 𝑢 ̅, the drop diameter 𝑑 In addition to these design improvements the application of the measurement technology has been extended to other multiphase flows and apparats, from extraction columns to mixer-settlers [29,30], reaction pumps [31], bubble columns [24,25,27,32], crystallization processes [28], evaporation [33] and spray regimes in distillation and absorption columns [34,35], where for the latter minor adaptions were necessary [36].…”