TECHNICAL PAPERS: Bubbles, Particles, and Droplets

Marangoni and Variable Viscosity Phenomena in Picoliter Size Solder Droplet Deposition

[+] Author and Article Information
M. Dietzel, S. Haferl, Y. Ventikos, D. Poulikakos

Laboratory of Thermodynamics in Emerging Technologies, Institute of Energy Technology, Department of Mechanical and Process Engineering, Swiss Federal Institute of Technology, ETH Center, 8092 Zurich, Switzerland

J. Heat Transfer 125(2), 365-376 (Mar 21, 2003) (12 pages) doi:10.1115/1.1532014 History: Received April 22, 2002; Revised October 11, 2002; Online March 21, 2003
Copyright © 2003 by ASME
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Comparison of different correlations for viscosity μ
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Sketch of the impingement process
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Maximum change of tangential vector
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Change of spreading with increasing droplet superheat (bold dotted line: constant viscosity and surface tension; thin dashed line: constant viscosity and variable surface tension; bold solid line: variable viscosity and surface tension): (a) T1,0=200°C; (b) T1,0=250°C; (c) T1,0=300°C; (d) T1,0=350°C; (e) T1,0=400°C; (f ) T1,0=450°C; and (g) T1,0=500°C.
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Spreading versus absolute Ma-number
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Vorticity and relative change in surface tension at time τ=0.3 for: (a) invariant; and (b) variant thermal properties (Ma=−49).
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(a) Illustration of spreading mechanism (left) and surface velocity vectors (right) at time τ=0.3; (b) vorticity field without Marangoni effect, τ=0.3; and (c) vorticity field with Marangoni effect, Ma=−49,τ=0.3.
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(a) Contact line freezing time versus absolute value of Ma-number; and (b) contact line freezing time versus superheat temperature.
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(a) Droplet spread radius; and (b) droplet top center of symmetry as a function of time τ.
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Evolution of surface temperature (a) and surface tension in time (b)
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Streamlines and isotherms in droplet at τ=0.6




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