(1-27) Droplet Impingement on Hot and Cold Walls Analyzed with Cyto-Fluid Dynamic Theory((FS-3)Fuel Sprays 3-Modeling)

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概要

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• The deformation, breakup, and evaporation processes of liquid droplets after impinging on hot and cold solid walls are analyzed with the cyto-fluid dynamic theory on liquid droplet deformations (Naitoh, K. and Takagi, Y, SAE Paper 962017,1996, K. Naitoh, Oil&Gas Science and Technology, Vol. 54, No. 2, 1999), the partial differential equation describing heat transfer process inside the droplet, and experimental visualizations. It should be emphasized that the cyto-fluid dynamic theory can predict the number of the child droplets caused by wall-impingiment and the mass of liquid remaining on the cold wall, while varying parent droplet sizes and parent droplet speeds. Then, the breakup processes at cold walls are analyzed with the experimental photographs. Figure 1 shows the experimental photograph of the child water droplets after the impingement on cold wet steel wall. The steel wall shows us a beautiful flower shape of child droplets. Next, the Leidenfrost phenomenon, is analyzed, that evaporation time of liquid droplet after hot-wall-impingiment is drastically changed according to increasing wall temperature. Figure 2 shows the calculated evaporation time plotted against wall temperature, when a droplet of n-heptane is employed. We can observe that the evaporation time drastically increases around the Leidenfrost temperature. The calculated results shown in Fig. 2 agree well with the experimental data (Chandra, S. and Avedisian, C. T., Proc., R. Soc., London A, 1991). The present analysis shows that, when the wall temperature is around the Leidenfrost point, the speed of expansion flow of vapor will become comparable to the deformation speed of droplet, that is, the speed of gravity center of the droplet on wall.

• 一般社団法人日本機械学会の論文
• 2001-07-01

著者

• Naitoh Ken

  Yamagata Univ.

• Naitoh Ken

  Yamagata University

• Morita Yoshitsune

  Yamagata University

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• (1-27) Droplet Impingement on Hot and Cold Walls Analyzed with Cyto-Fluid Dynamic Theory((FS-3)Fuel Sprays 3-Modeling)
• Cyto-fluid Dynamic Theory
• Mesoscopic kinetic theory for fluid dynamic phenomena and biochemical reaction processes

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