Abstract
In this paper, the flash evaporation process of saltwater droplets released into vacuum is experimentally investigated. During the experiment, a saltwater (NaCl) droplet was suspended on a thermocouple junction, which was used to measure the temperature evolution. The droplet surface temperature was captured by an infrared thermal imager, and the shape variation was recorded by a high speed camera. According to the experimental results, the component and solution concentration has great influence on the evaporation process. With a rise of salt concentration in water, the evaporation rate decreases. The shape of temperature transition curve also depends on the salt concentration in solution, no matter whether it is higher or lower than the eutectic point (22.4%). The effects of environmental pressure, initial droplet temperature and initial droplet diameter on the temperature transition of droplets were also summarized based on the experimental data.
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References
Akridge, D.G.: Methods for calculating brine evaporation rates during salt production. J. Archaeological Science. 35, 1453–1462 (2008)
Darwish, M.A., Al-Najem, N.M.: Energy consumption by multi-stage flash and reverse osmosis desalters. Appl. Therm. Eng. 20, 399–416 (2002)
Jeong, S., Garimella, S.: Falling-film and droplet mode heat and mass transfer in a horizontal tube LiBr/water absorber. Int. J. Heat Mass Transfer 45, 1445–1458 (2002)
Nam, J.H., Song, C.S.: Numerical simulation of conjugate heat and mass transfer during multi-dimensional freeze drying of slap shaped food products. Int. J. Heat Mass Transfer 50, 4891–4900 (2007)
Satoh, I., Fushinobu, K., Hashimoto, Y.: Freezing of a water droplet due to evaporation-heat transfer dominating the evaporation-freezing phenomena and the effect of boiling on freezing characteristics. Int. J. Refrig. 25, 226–234 (2002)
Shin, H.T., Lee, Y.P., Jurng, J.: Spherical-shaped ice partical production by spraying water in a vacuum chamber. Appl. Therm. Eng. 20, 439–454 (2000)
Yang, L., Shen, S.: Experimental study of falling film evaporation heat transfer outside horizontal tubes. Desalination 220, 654–660 (2008)
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Liu, L., Bi, Qc. & Li, Hx. Experimental Investigation on Flash Evaporation of Saltwater Droplets Released into Vacuum. Microgravity Sci. Technol. 21 (Suppl 1), 255–260 (2009). https://doi.org/10.1007/s12217-009-9140-x
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DOI: https://doi.org/10.1007/s12217-009-9140-x