Browse Prior Art Database

Molten drop deposition and the dynamics of the molten contact line

IP.com Disclosure Number: IPCOM000128089D
Original Publication Date: 1999-Dec-31
Included in the Prior Art Database: 2005-Sep-14
Document File: 12 page(s) / 36K

Publishing Venue

Software Patent Institute

Related People

Duthaler, Gregg Michael: AUTHOR [+3]

Related Documents

http://theses.mit.edu:80/Dienst/UI/2.0/Describe/0018.mit.theses/1999-32: URL

Abstract

The development of many advanced manufacturing technologies requires a basic understanding of how molten materials spread over cold, solid surfaces. Of particular interest are molten drop deposition processes in which the drops arrest by solidification before they reach an equilibrium configuration on the solid. Central to this spreading process is the molten dynamic contact line problem, which involves the relationship between the speed of the contact line and the apparent (visible to the observer) contact angle of the molten liquid. This thesis examines the deposition of millimeter-scale molten drops on cold, solid surfaces. Arrest angle data are obtained for solder drops deposited on oxidized solid solder, octacosane (C2sH58) on solid octacosane, and octacosane on glass coated with different types of self assembled monolayers (SAMs). Direct measurements of the velocity-angle relationship are obtained for microcrystalline wax drops deposited on wax targets, both horizontal and inclined, and for water drops deposited on ice. The observations are consistent with Schiaffino and Sonin's (e.g. 1997, Phys. Fluids, 9 (8), 2217-2226 and 2227-2233, and 9 (11), 3172-3187) molten contact line model, except for the depositions on inclines, which reveal that the molten contact line may experience "; stickslip "; motion and arrest with apparent contact angles that are inconsistent with existing empirical correlations. A theoretical model for quasi-steady molten contact line motion is developed using a simple piecewise approximation of the shape of the solidification front based upon Schiaffino and Sonin's calculations. By considering the flow field very near the contact line, the relationship between the apparent contact angle, the dimensionless advance speed, and other relevant system parameters is established. When the molten contact line is very close to arrest this relationship reduces to a simple analytical expression, denoted the near-arrest law. Considering its approximations, the model provides surprisingly good agreement with the experimental data, provided the data meet the requirements of quasi-steady, inertia free flow near the contact line. Thesis Supervisor: Professor Ain A. Sonin Title: Professor of Mechanical Engineering [2]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 10% of the total text.

Page 1 of 12

 This record is the front matter from a document that appears on a server at MIT and is used through permission from MIT. See http://theses.mit.edu:80/Dienst/UI/2.0/Describe/0018.mit.theses/1999-32 for copyright details and for the full document in image form.

Molten Drop Deposition and the Dynamics of the Molten Contact Line

by

Gregg Michael Duthaler
B.S.E. in Mechanical Engineering, Princeton University, 1992 S.M. in Mechanical Eningeering, Massachusetts Institute of Technology, 1995 Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Mechanical Engineering

at the Massachusetts Institute of Technology

February 1999
SIGNATURE OF author: [[signature omitted]]

Department of Mechanical Engineering

October 16, 1998

CERTIFIED BY: [[SIGNATURE OMITTED]]

Ain A. Sonin Professor, Mechanical Engineering Thesis Supervisor ACCEPTED BY: [[SIGNATURE OMITTED]]

Ain A. Sonin Chairman, Departmental Committee on Graduate Studies Department of Mechanical Engineering
ARCHIVES MASSACHUSETTS INSTITUTE OF TECHNOLOGY LIBRARIES JUL 12 1999

Massachusetts Institute of Technology Page 1 Dec 31, 1999

Page 2 of 12

Molten drop deposition and the dynamics of the molten contact line

Molten Drop Deposition and the Dynamics of the Molten Contact Line

by

Gregg Michael Duthaler

Submitted to the Department of Mechanical Engineering on October 16, 1998 in Partial Fulfillment of the Requirements of the Degree of Doctor of Philospohy in Mechanical Engineering

Abstract

The development of many advanced manufacturing technologies requires a basic understanding of how molten materials spread over cold, solid surfaces. Of particular interest are molten drop deposition processes in which the drops arrest by solidification before they reach an equilibrium configuration on the solid. Central to this spreading process is the molten dynamic contact line problem, which involves the relationship between the speed of the contact line and the apparent (visible to the observer) contact angle of the molten liquid.

This thesis examines the deposition of millimeter-scale molten drops on cold, solid surfaces. Arrest angle data are obtained for solder drops deposited on oxidized solid solder, octacosane (C2sH58) on solid octacosane, and octacosane on glass coated with different types of self assembled monolayers (SAMs). Direct measurements of the velocity-angle relationship are obtained for microcrystalline wax drops deposited on wax targets, both horizontal and inclined, and for water drops deposited on ice. The observations are consistent with Schiaffino and Sonin's (e.g. 1997, Phys. Fluids, 9 (8), 2217-2226 and 2227-2233, and 9 (11), 3172-3187) molten contact line model, except for the depositions on inclines, which reveal that the molten contact line may experience " stickslip " motion and arrest with apparent contact angles that are inconsistent with existing empirical correlations.

A theoretical model for quasi-steady molten contact line motio...