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DOI: 10.1615/IHTC13.p11.50
page 12

J. Yang
Rutgers, the State University of New Jersey, Piscataway, USA

Yogesh Jaluria
Department of Mechanical and Aerospace Engineering Rutgers-New Brunswick, The State University of New Jersey Piscataway, NJ 08854, USA


A numerical model based on the mass, momentum and energy equations is proposed to investigate the hollow glass fiber drawing process. Axisymmetric flow of gas in the central cavity, as well as the flow of glass and aiding purge gas, are considered. The two neck-down profiles, which are the inner and outer surfaces of the hollow fiber, are generated by using an iterative scheme. The optical thick approximation, as well as the zonal model, are applied to calculate the radiative transport within the glass. The Boussinesq approximations are used for the buoyancy effects. The model can simulate the complex thermal transport process in the cylindrical furnace and show the effects of variation in different parameters. The geometry of the final hollow fiber is predicted and feasible combinations of parameters for successful hollow fiber drawing are obtained. The validation of the model is carried out by comparing the predictions with the results for solid-core fiber drawing and with available experimental and numerical results for hollow fibers. It is shown that the results from the model are consistent with the physical trends and agree well with the results in the literature.

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Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION