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research-article

Thermo-fluid characteristics of Czochralski melt convection using 3D URANS computations

[+] Author and Article Information
Sudeep Verma

DRDO, Timarpur Delhi, Delhi 110054 India sudeep.verma@sspl.drdo.in

Anupam Dewan

Department of Applied Mechanics Hauz Khas New Delhi, Delhi 110016 India adewan@am.iitd.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received February 1, 2019; final manuscript received April 8, 2019; published online xx xx, xxxx. Assoc. Editor: Sandip Mazumder.

ASME doi:10.1115/1.4043513 History: Received February 01, 2019; Accepted April 10, 2019

Abstract

Turbulent characteristics of Czochralski melt flow are presented using the URANS turbulence modelling approach. Three-dimensional, transient computations were performed using the Launder and Sharma low-Re k-ε model and Menter SST k-ω model on an idealized Czochralski set-up with counter-rotating crystal and crucible. A comparative assessment is performed between these two RANS models in capturing turbulent thermal and flow behaviors. It was observed that the SST k-ω model predicted a better resolution of the Czochralski melt flow capturing the near wall thermal gradients, resolving stronger convective flow at the melt free surface, deciphering more number of characteristics Czochralski recirculating cells along with predicting large number of coherent eddy structures and vortex cores distributed in the melt and hence a larger level of turbulent intensity in the Czochralski melt compared to that by Launder and Sharma low-Re k-ε model.

Copyright © 2019 by ASME
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