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Direct numerical simulation of momentum and heat transport in idealized Czochralski crystal groth configurations

Wagner, Claus and Friedrich, Rainer (2003) Direct numerical simulation of momentum and heat transport in idealized Czochralski crystal groth configurations. In: Third Symposium on Turbulence and Shear Flow Phenomena 2003, pp. 775-780. Begell House. Third Symposium on Turbulence and Shear Flow Phenomena, 2003-06-25 - 2003-06-27, International Center, Sendai, Japan. doi: 10.1615/TSFP3.1310. ISSN 2642-0554.

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Official URL: https://dl.begellhouse.com/references/3ce1b491115b5c16,3658f79a5fcf8fbd,6ccdaf02778538c2.html#

Abstract

Turbulent momentum and heat transport in idealized Czochralski crystal growth configurations is investigated by means of direct numerical simulation. The analysis of the flow data focuses on the influence of crystal and crucible rotation on the flow structures and the development of temperature fluctuations. A numerical parameter study is performed to investigate how the variation of the numerous flow parameters affect the turbulent transport processes. Finally, a direct numerical simulation is conducted with parameters taken from experiment in order to allow a direct comparison between numerical and experimental results. It is found that the counter-rotation of the crystal and crucible leads to a complex flow, which is characterized by three major recirculation zones, if crucible rotation dominates the flow. The dynamics of the flow are controlled by centrifugal forces counteracting buoyancy and surface tension effects. High temperature fluctuations are created within or close to the crystallization zone. Neither a variation of the melt height, nor a reduction of the crystal rotation rate or a change of the Grashof and Marangoni numbers has a major effect on the bulk flow structure and overall heat transfer. Increasing rotation of the crystal changes the bulk flow structure strongly and leads to an increased value of maximum rms temperature fluctuations, the position of which is shifted towards the crucible bottom. A shifted position of maximum rms temperature fluctuations is also observed if heat radiation across the free surface is taken into account.

Item URL in elib:https://elib.dlr.de/193331/
Document Type:Conference or Workshop Item (Speech)
Title:Direct numerical simulation of momentum and heat transport in idealized Czochralski crystal groth configurations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Friedrich, RainerTU MünchenUNSPECIFIEDUNSPECIFIED
Date:2003
Journal or Publication Title:Third Symposium on Turbulence and Shear Flow Phenomena 2003
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI:10.1615/TSFP3.1310
Page Range:pp. 775-780
Publisher:Begell House
ISSN:2642-0554
Status:Published
Keywords:DNS, Czochralksi flow
Event Title:Third Symposium on Turbulence and Shear Flow Phenomena
Event Location:International Center, Sendai, Japan
Event Type:international Conference
Event Start Date:25 June 2003
Event End Date:27 June 2003
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Energie und Verkehr (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Wagner, Prof. Dr.-Ing. Claus
Deposited On:30 Mar 2023 16:05
Last Modified:24 Apr 2024 20:54

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