The liquid film remaining on a wire withdrawn from a liquid bath and forced through an annular jet is experimentally investigated on a dedicated facility. An optical laser-based technique recently introduced to study liquid-film instabilities on small-radius cylinders allows the measurement of the mean final thickness and wave characteristics. Experimental results are compared to analytical predictions obtained with a simple model specifically derived for this configuration and based on liquid-film properties (density, viscosity and surface tension) and operating parameters (wire speed, nozzle dimensions and stagnation pressure). Such a model relies on the knowledge of pressure-gradient and wall shear-stress distributions generated by the annular jet radially impinging on the cylinder. Different correlations providing the maxima of these profiles are employed and, after some improvements to the original “knife” model, the mean final thickness is correctly predicted. Successful results are obtained, also, using a simple expression derived from the LLD theory. The experimental measurement of surface-perturbation features (wave amplitude, wavelength and amplification factor) as a function of the operating parameters leads to some important conclusions that could have a remarkable and direct influence on the industrial process of wire coating.
Experiments in Fluids – Springer Journals
Published: Sep 20, 2008
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