Numerical Prediction of Water Droplet to Investigate the Evaporation Process within Venturi Tubes Under Varying Pressure Conditions
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Abstract
The evaporation of water droplets is influenced by various factors. Especially, pressure is a significant factor affecting the water droplets evaporation process. To study this phenomenon, the Computational Fluid Dynamics (CFD) for continuous phase flows, RANS 3D steady equations were solved in combination with the realizable k-Ɛ turbulence model. Lagrangian trajectory simulations of droplets evaporation was simulated by Discrete Phase Model (DPM) and species transport model. The evaporation time of 10-micron droplets under atmospheric pressure was determined through droplets simulation. Results from comparing the droplets evaporation time, show that the evaporation times for droplets within the tube under various pressure conditions (i.e. 0.5 bar - atmospheric pressure) were 0.05002 s - 0.08235 s. This represented a decrease of 11.52% - 39.26% of the evaporation time at atmospheric pressure. Furthermore, there was observed that the droplets evaporation time is shorter under low-pressure conditions, and decreasing air pressure enhances devolatilization in water droplets. This observation led to the simulation of a venturi throat with various throat sizes and pressure conditions. This study aimed to investigate the behavior of evaporating droplets in the venturi throat. According to the results, it was observed that reducing the diameter size of the venturi throat (0.1 – 1.0 meters) led to a decrease in the droplets evaporation times by 0.41% - 26.58%. In addition, it was noted that higher speeds airflow in venturi throat result in lower air pressure and evaporation time.
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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