# American Institute of Mathematical Sciences

May  2007, 7(3): 553-572. doi: 10.3934/dcdsb.2007.7.553

## Stretching of heated threads with temperature-dependent viscosity: Asymptotic analysis

 1 Centre for Industrial and Applied Mathematics, Mathematical Institute, University of Oxford, Oxford OX1 3LB, United Kingdom 2 Department of Mathematics, City University of Hong Kong, Kowloon, Hong Kong, China 3 Department of Mathematics and Statistics, York University, 4700 Keele Street, Toronto, ON M3J 1P3 4 Department of Mathematical Sciences, New Jersey Institute of Technology, University Heights, Newark, NJ 07102, United States

Received  August 2006 Revised  January 2007 Published  February 2007

We consider the stretching of a thin cylindrical thread with viscosity that depends on temperature. The thread is pulled with a prescribed force while receiving continuous heating from an external axially nonuniform heater. We use the canonical equations derived by Huang et al. (2007) and consider the limit of large dimensionless heating rate. We show that the asymptotic solution depends only on the local properties of the heating near its maximal heating value. We derive a uniformly valid asymptotic solution for the shape and the temperature profiles during the stretching process. We use a criterion to determine when breaking will occur and derive simple analytical expressions for the shape at breaking that clearly show the influence of heating strength and the degree of localization of the heating. The asymptotic shape profiles give good agreement with numerical simulations. These results are applied to the formation of glass microelectrodes.
Citation: P. D. Howell, J. J. Wylie, Huaxiong Huang, Robert M. Miura. Stretching of heated threads with temperature-dependent viscosity: Asymptotic analysis. Discrete and Continuous Dynamical Systems - B, 2007, 7 (3) : 553-572. doi: 10.3934/dcdsb.2007.7.553
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