| Autor: |
Goossens, H. W. J., Cleijne, J. W., Smolders, H. J., Dongen, M. E. H. |
| Zdroj: |
Experiments in Fluids; January 1988, Vol. 6 Issue: 8 p561-568, 8p |
| Abstrakt: |
A model is presented for the droplet evaporation process induced by a shock wave propagating in a fog. The model is based on the existence of a quasi-steady wet bulb state of the droplets during evaporation. It is shown that for moderate shock strength, Ma = < 2, and droplet radii in the range of 1–5 the, the major part of the evaporation process is governed by a balance between heat conduction and vapour diffusion. The formation of a fog by means of an unsteady adiabatic expansion of humid nitrogen is described. Experimental results of shock induced evaporation are shown for shock Mach numbers from 1.2 to 2.1, droplet mass fraction of 5 · 10-3, and initial droplet radii of 1–1.4 µm. The expected linear relation between droplet radius squared and time during evaporation is observed. Characteristic evaporation times appear to be strongly dependent on shock strength. A variation of about two decades, predicted by theory, was experimentally observed for the Mach number range studied. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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