Abstract
The evolution of the flow and temperature fields produced by rectangular heat pulses on the background of a steady velocity and vortex line density (VLD) field is considered. This flow is described by a simplified linearised theoretical model exhibiting the dynamics of the VLD evolution. The Gorter-Mellink coefficient A is obtained from experiments on the decay of weak temperature pulses with distance from the heater. A comparison of experimental and theoretical temperature-time slopes yields a correction factor to the growth and decay coefficients of Vinen's VLD evolution equation.
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