Droplet Entrainment Analysis in a Flash Evaporator with an Image-Based Measurement Technique |
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Authors: | Katharina Jasch Jonas Schulz Hans-Jörg Bart Stephan Scholl |
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Affiliation: | 1. Technische Universität Braunschweig, Institut für Chemische und Thermische Verfahrenstechnik, Langer Kamp 7, 38106 Braunschweig, Germany;2. Technische Universität Kaiserslautern, Chair of Separation Science and Technology, Gottlieb-Daimler-Straße 44, 67663 Kaiserslautern, Germany |
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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 µm) and at the same time fast droplets under challenging operating conditions, such as vacuum and superheated feed similar to industrial process conditions. |
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Keywords: | Droplet detection Entrainment Flash evaporator Flashing feed Image analysis |
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