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Surfactant

Instabilities

on Thin Films

by

Angelica Aessopos

B.S.,

University of

Nottingham

(2003)

Submitted

to

the Department

of

Mechanical

Engineering

in partial

fulfillment of

the

requirements

for

the degree

of

MASSACHUSETS

INS

E

Master

of Science

OF

TECHNOLOGY

JUL

N

2005

at

the

LIBRARIES

MASSACHUSETTS

INSTITUTE OF

TECHNOLOGY

June

2005

Angelica

Aessopos.

All rights reserved.

The

author

hereby

grants

to

Massachusetts

Institute

of Technology

permission

to

reproduce and

to

distribute copies

of this

thesis document

in whole or in part.

Signature

of Author

.............................

.....

Department

of Mechanical

Engineering

May

6, 2005

Certified by .................................

Anette

Hosoi

Assistant

Professor

of Mechanical

Engineering

Thesis

Supervisor

A ccepted

by....................................

Lallit Anand

BARKER

Professor

of

Mechanical Engineering

Chairman, Committee on Graduate

Students

8/10/2019 modelamiento y ensayo.

2/92

Surfactant Instabilities on

Thin Films

by

Angelica Aessopos

Submitted

to

the

Department

of

Mechanical

Engineering

on

May 6, 2005,

in partial

fulfillment

of

the

requirements for the degree of

Master

of

Science

Abstract

The

deposition

of a surfactant

drop over a thin

liquid

film may be accompanied

by a fingering

instability.

In

this work, we present experimental results which identify the critical parameters

that

govern

the shape and

extend of the

fingering phenomena.

It was

found that the normalized

wavelength, A/t, scales

with

Marangoni

number,

Ma=Ayt/paD,

to the -1 exponent for

any

Marangoni higher

than

4.3

-

10

7

.

On

the other

end

,

for Marangoni