caa a22 4500 463231813 CHVBK 20180405153244.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10853-007-1757-9 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1757-9 Solidification contact angles of molten droplets deposited on solid surfaces [Elektronische Daten] [Ri Li, Nasser Ashgriz, Sanjeev Chandra, John Andrews] Droplet impact and equilibrium contact angle have been extensively studied. However, solidification contact angle, which is the final contact angle formed by molten droplets impacting on cold surfaces, has never been a study focus. The formation of this type of contact angle was investigated by experimentally studying the deposition of micro-size droplets (∼39μm in diameter) of molten wax ink on cold solid surfaces. Scanning Electron Microscope (SEM) was used to visualize dots formed by droplets impacted under various impact conditions, and parameters varied included droplet initial temperature, substrate temperature, flight distance of droplet, and type of substrate surface. It was found that the solidification contact angle was not single-valued for given droplet and substrate materials and substrate temperature, but was strongly dependent on the impact history of droplet. The angle decreased with increasing substrate and droplet temperatures. Smaller angles were formed on the surface with high wettability, and this wetting effect increased with increasing substrate temperature. Applying oil lubricant to solid surfaces could change solidification contact angle by affecting the local fluid dynamics near the contact line of spreading droplets. Assuming final shape as hemispheres did not give correct data of contact angles, since the final shape of deposited droplets significantly differs from a hemispherical shape. Springer Science+Business Media, LLC, 2007 Li Ri Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, M5S3G8, Toronto, Ontario, Canada aut Ashgriz Nasser Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, M5S3G8, Toronto, Ontario, Canada aut Chandra Sanjeev Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, M5S3G8, Toronto, Ontario, Canada aut Andrews John Xerox Corporation, Wilson Center for Research and Technology, 800 Phillips Rd. M/S 114-44D, 14580, Webster, NY, USA aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/23(2007-12-01), 9511-9523 0022-2461 42:23<9511 2007 42 10853 https://doi.org/10.1007/s10853-007-1757-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1757-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Ri Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, M5S3G8, Toronto, Ontario, Canada aut NATIONALLICENCE 700 1- Ashgriz Nasser Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, M5S3G8, Toronto, Ontario, Canada aut NATIONALLICENCE 700 1- Chandra Sanjeev Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, M5S3G8, Toronto, Ontario, Canada aut NATIONALLICENCE 700 1- Andrews John Xerox Corporation, Wilson Center for Research and Technology, 800 Phillips Rd. M/S 114-44D, 14580, Webster, NY, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/23(2007-12-01), 9511-9523 0022-2461 42:23<9511 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer