Haoyu Wu1, Weimin Liu1, Xiaoming Li2, Fengyun Chen1 and Longbin Yang This email address is being protected from spambots. You need JavaScript enabled to view it.3
1The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, P.R. China 2School of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, P.R. China 3College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, P.R. China
Received: July 23, 2018 Accepted: December 17, 2018 Publication Date: June 1, 2019
Flash evaporation is extensively used in industrial application. In order to investigate flash evaporation, a new experimental system equipped with the high-speed CCD digital camera and data acquisition instruments is established. A series of experiments has been carried out with various initial temperatures from 50.0 C to 90.5 C, initial water heights of 400 mm to 550 mm, and superheats ranging from 1.5 K to 17.8 K. It is revealed that flashing phenomenon process includes three stages: bubbles generation stage, boiling growth stage and boiling reduction stage. Moreover, the heat transfer characteristics and flow mechanism of each stage has explored. In addition, a correlation between the propagation speed of flash evaporation wave and superheat degree was obtained. Results indicated that the intensity of flash evaporation drastically increases with the increasing of superheat.
[1] Shao, Y. X., Y. J. Li, L. B. Yang, X. J. Zhang, L. J. Yang, H. Y. Wu, R. Z. and Xu (2014) New experimental system for high pressure and high temperature flashing evaporation experiments, Applied Thermal Engineering 66(12), 148155. doi: 10.1016/j. applthermaleng.2014.01.020
[2] Miyatake, O., K. Murakami, Y. Kawata, and T. Fujii (1973) Fundamental experiments with flash evaporation, Heat Transfer-Japanese Research 2(4), 89100.
[3] Kim, J. I., and N. Lior (1997) Some critical transition in pool flash evaporation, Heat Mass Transfer 40(10), 22632372. doi: 10.1016/S0017-9310(96)00296-7
[4] Saury, D., S. Harmand, and M. Siroux (2002) Experimental study of flash evaporation of a water film, International Journal of Heat and Mass Transfer 45(16), 34473457. doi: 10.1016/S0017-9310(02)00056-X
[5] Saury, D., S. Harmand, and M. Siroux (2005) Flash evaporation from a water pool: influence of the liquid height and of the depressurization rate, International Journal of Thermal Sciences 44(10), 953–965. doi: 10.1016/j.ijthermalsci.2005.03.005
[6] Zhang, D., D. T. Chong, and J. J. Yan (2012) Experimental study on static flash evaporation of aqueous NaCl solution, International Journal of Heat and Mass Transfer 55(2324), 71997206. doi: 10.1016/j. ijheatmasstransfer.2012.07.036
[7] Zhang, D., D. T. Chong, J. J. Yan, and Y. S. Zhang (2012) Study on steam-carrying effect in static flash evaporation, International Journal of Heat and Mass Transfer 55(1718), 44874497. doi: 10.1016/j. ijheatmasstransfer.2012.03.013
[8] Grolmes, M. A., and H. K. Fauske (1974) Axial propagation of free surface boiling into superheated liquids in vertical tubes, Proc. Fifth Intl. Heat Transfer Conf, Tokyo, Japan., Sep. 27, 30–34.
[9] Hill, L. G., and B. Sturtevant (1989) An experimental study of evaporation waves in a superheated liquid, IUTAM Symp. on Adiabatic Waves in Liquid-Vapor Systems, Göttingen, Germany, Aug. 28Sep. 1, 25– 37. doi: 10.1007/978-3-642-83587-2_3
[10] Hahne, E., and G. Barthau (2000) Evaporation waves in flashing process, International Journal of Multiphase Flow 26(4), 531547. doi: 10.1016/S03019322(99)00031-2
[11] Reinke, P., and G. Yadigaroglu (2001) Explosive vaporization of superheated liquids by boiling fronts, International Journal of Multiphase Flow 27(9), 1487 1516. doi: 10.1016/S0301-9322(01)00023-4
[12] Simões-Moreira, J. R., and J. E. Shepherd (1999) Evaporation waves in superheated dodecane, Journal of Fluid Mechanics (382), 63–86. doi: 10.1017/S002211 2098003796
[13] Zhang, D., B. C. Zhao, J. J. Yan, and Q. Z. Yang (2014) Experimental study on staticflash vaporization of aqueous NaCl solution at different flash speed: steam-carrying effect, International Journal of Heat and Mass Transfer 79, 618627. doi: 10.1016/j.ijheatmasstransfer. 2014.08.077
[14] Zhang, D., D. T. Chong, J. J. Yan, and B. C. Zhao (2013) Experimental study on static flash evaporation of aqueous NaCl solution at different flash speed: heat transfer characteristics, International Journal of Heat and Mass Transfer 65, 584591. doi: 10.1016/j. ijheatmasstransfer.2013.06.042
[15] Yang, L. J. (2012) Experimental Study on Flash Evaporation after Pressure Drop, M.S thesis, Harbin Engineering University, Harbin.
[16] Wu, H. Y. (2014) Experimental Study of Heat and Mass Transfer of Flash Evaporation, M.S thesis, Harbin Engineering University, Harbin.
[17] Lu, Z. Q. (2002) Two Phase Flow and Boiling Heat Transfer, 1st ed., Tsinghua University Press, Beijing.
[18] Liao, Y. X., D. Lucas, E. Krepper, and R. Rzehak (2013) Flashing evaporation under different pressure levels, Nuclear Engineering and Design 265, 801 813. doi: 10.1016/j.nucengdes.2013.09.027
We use cookies on this website to personalize content to improve your user experience and analyze our traffic. By using this site you agree to its use of cookies.