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Indexed by:期刊论文

Date of Publication:2014-01-01

Journal:EXPERIMENTAL THERMAL AND FLUID SCIENCE

Included Journals:SCIE、EI

Volume:52

Page Number:97-103

ISSN No.:0894-1777

Key Words:Drop impact; Wetted cylinder; Rebound; Spreading

Abstract:Experimental observations and measurements concerning rebound and spreading behaviors during a single drop impact on wetted cylindrical surfaces are performed using a high speed digital camera at 10,000 frames per second. Butanol and heptane are selected as experimental fluids with the cylinder-drop curvature ratio ranging from 0.090 to 2.395. The rebound phenomenon is observed when the butanol drop impinges on the wetted cylinders with a low impact Weber number, while it does not occur for the heptane drop. The rebound critical Weber number varies less when the curvature ratio is less than 0.5, while it decreases a lot with the curvature ratio larger than 0.5. The maximum deformation factor and the fluctuation period increase with the Weber number, but the minimum value decreases, and the appearance for the two extreme values is delayed. The curvature ratio also has a major effect on the deformation factor. For drop spreading, the spreading factor increases with the decrement in the curvature ratio and the Ohnesorge number. The Weber number almost has no impact on the heptane drop spreading factor, whereas it becomes influential at later stage for butanol. Finally, a preliminary model is proposed to predict the spreading scale as well. (C) 2013 Elsevier Inc. All rights reserved.