Dissertation/Thesis Abstract

Characteristic Behavior of a Side Branch in a Dendritic Crystal Growth
by Park, Jun Gwan, Ph.D., The Ohio State University, 2007, 140; 10835950
Abstract (Summary)

This study investigates the characteristic behavior of disturbances on the interface of a needle crystal, Ivantsove parabola, based on an asymptotic analysis as well as a numerical study.

Focusing on tip growth and width behavior, we examine anisotropy in surface energy, initial strength of the disturbances.

It is found that a tip grows as ftip = exp (Ct) close to the tip region and ftip = exp(Ct1/2) at far field and wave-length, λ o, does not show large variation to different initial conditions so that the width of a disturbance behaves asΔy ~ y 1/2λo.

This constant wave-length, λo, suggests that the possibility of the existence of an attractor in λo. An evolution of finger competition between two disturbances with different initial strengths is investigated to understand the selection mechanism.

Indexing (document details)
Advisor: Foster, Michael
School: The Ohio State University
Department: Aeronautical and Astronautical Engineering
School Location: United States -- Ohio
Source: DAI-B 79/09(E), Dissertation Abstracts International
Subjects: Aerospace engineering
Keywords: Anisotropy, Crystal growth, Dendrite, Finger competition, Side branch, Surface tension
Publication Number: 10835950
ISBN: 9780355970890
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