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Control of fluid flow during Bridgma...

Zawilski, Kevin Thomas.

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Control of fluid flow during Bridgman crystal growth using low-frequency vibrational stirring.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Control of fluid flow during Bridgman crystal growth using low-frequency vibrational stirring./
Author:	Zawilski, Kevin Thomas.
Description:	151 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5730.
Contained By:	Dissertation Abstracts International64-11B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3111827

Control of fluid flow during Bridgman crystal growth using low-frequency vibrational stirring.
Zawilski, Kevin Thomas.

Control of fluid flow during Bridgman crystal growth using low-frequency vibrational stirring. - 151 p.

Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5730.

Thesis (Ph.D.)--Stanford University, 2004.

The goal of this research program was to develop an in depth understanding of a promising new method for stirring crystal growth melts called coupled vibrational stirring (CVS). CVS is a mixing technique that can be used in sealed systems and produces rapid mixing through vortex flows. Under normal operating conditions, CVS uses low-frequency vibrations to move the growth crucible along a circular path, producing a surface wave and convection in the melt.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Control of fluid flow during Bridgman crystal growth using low-frequency vibrational stirring.
LDR:03063nmm 2200313 4500 001 1865684
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035 $a (UnM)AAI3111827
035 $a AAI3111827
040 $a UnM $c UnM
100 1 $a Zawilski, Kevin Thomas. $3 1953112
245 1 0 $a Control of fluid flow during Bridgman crystal growth using low-frequency vibrational stirring.
300 $a 151 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5730.
500 $a Adviser: Robert S. Feigelson.
502 $a Thesis (Ph.D.)--Stanford University, 2004.
520 $a The goal of this research program was to develop an in depth understanding of a promising new method for stirring crystal growth melts called coupled vibrational stirring (CVS). CVS is a mixing technique that can be used in sealed systems and produces rapid mixing through vortex flows. Under normal operating conditions, CVS uses low-frequency vibrations to move the growth crucible along a circular path, producing a surface wave and convection in the melt.
520 $a This research focused on the application of CVS to the vertical Bridgman technique. CVS generated flows were directly studied using a physical modeling system containing water/glycerin solutions. Sodium nitrate was chosen as a model growth system because the growth process could be directly observed using a transparent furnace. Lead magnesium niobate-lead titanate (PMNT) was chosen as the third system because of its potential application for high performance solid state transducers and actuators.
520 $a In this study, the critical parameters for controlling CVS flows in cylindrical Bridgman systems were established. One of the most important results obtained was the dependence of an axial velocity gradient on the vibrational frequency. By changing the frequency, the intensity of fluid flow at a given depth can be easily manipulated.
520 $a The intensity of CVS flows near the crystal-melt interface was found to be important. When flow intensity near the interface increased during growth, large growth rate fluctuations and significant changes in interface shape were observed. To eliminate such fluctuations, a constant flow rate near the crystal-melt interface was maintained by decreasing the vibrational frequency. A continuous frequency ramp was found to be essential to grow crystals of good quality under strong CVS flows.
520 $a CVS generated flows were also useful in controlling the shape of the growth interface. In the sodium nitrate system without stirring, high growth rates produced a very concave interface. By adjusting the flow intensity near the interface, CVS flows were able to flatten the growth interface under these extreme growth conditions.
590 $a School code: 0212.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Chemistry, Inorganic. $3 517253
690 $a 0794
690 $a 0488
710 2 0 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 64-11B.
790 1 0 $a Feigelson, Robert S., $e advisor
790 $a 0212
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3111827