期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 69, 期 -, 页码 55-61出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2017.10.007
关键词
Drop impact; Regime map; Urea water solution; Leidenfrost point
资金
- Deutsche Forschungsgemeinschaft (DFG) Collaborative Research Centre [SFB-TRR150]
In the present work, impingement behaviour of an aqueous urea solution is investigated experimentally. The effects of droplet diameter, impact velocity and substrate temperature are evaluated by monitoring single droplet impingement with a high-speed camera. Results allow the formulation of four different interaction regimes and a regime map depending on hydrodynamic and thermal parameters is proposed. The regimes deposition, splash, boiling-induced breakup, rebound with breakup and the transition boundaries are discussed in detail. Results show that the solute significantly affects the outcome of droplet impingement promoting droplet disintegration by enhanced nucleation and bubble formation. Comparison with literature data reveal the strong dependency of droplet impact behavior on the Weber number as a combination of initial droplet diameter and impact velocity.
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