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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

THE EFFECTS OF VARIABLE VISCOSITY AND VISCOUS DISSIPATION ON THE FLOW AND THERMAL TRANSPORT DURING OPTICAL FIBER DRAWING

Get access (open in a dialog) DOI: 10.1615/IHTC10.190
pages 303-308

Resumo

In the present study, the coupled two-dimensional free-surface flow and thermal transport of fused silica with viscous dissipation and a prescribed necking shape is considered. The viscosity is temperature dependent, and the density is assumed to be constant at 2200 kg/m3. The main objective is to investigate the effects of variable viscosity and viscous dissipation on the thermal and material transport within the neck-down region. The obtained results were verified through physical consistency and comparisons with results on duct flow with variable properties. The results showed that the vorticity was localized to the neck-down region while the viscous dissipation was localized to the region upstream of where the necking terminated. In addition, there existed temperature and velocity lags (defined to be the difference between the surface and center value, divided by the center value) of 9 % and 3.5 %:, respectively. The latter is of particular importance since it implies a possibility of material re-distribution within the necking region.