The theoretical solidification models of a melt droplet impinging on a cold surface
Date Issued
2004
Date
2004
Author(s)
Chiu, Han-Ru
DOI
zh-TW
Abstract
The predictive theoretical model which investigates the spread factor of a droplet impinging solid surface without solidification had been developed, and had got well agreement with experiments by the previous works[8,10]. In the case that wall temperature is less than the solidification point of droplets，solidification would happen simultaneously. So the present study aims to develop another resemble theoretical model in which considers solidification, based on isothermal surface through the laws of continuity, energy conservation, and flow rate conservation. The developed model mainly focuses on the physical and thermodynamic properties of droplet, ignores that of surface in order to simplify the model. A time correcting factor is introduced into the spread factor model to account for the reality that the solidification of droplet accompanies with spreading，and which may improve its prediction. In addition, several theoretical models are also constructed in the study as follows: splashing criterion ; avoiding parameter for central prominence of splat, ＞0.5; and maximum spread speed, . The present study has shown a well agreement to experiments or other models within about 10% error analysis.
Subjects
液滴撞擊
擴張因子
飛濺參數
最大擴張速度
厚凸參數
spread factor
avioding parameter
droplet impinging
splash criterion
maximun spread velocity
SDGs
Type
thesis
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