{'fraction_non_alphanumeric': 0.008056394763343404, 'fraction_numerical': 0.0, 'mean_word_length': 5.060975609756097, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Cavitation in an oscillatory squeeze film rheometer

The effect of cavitation on plate force is considered in an oscillatory squeeze film rheometer. A model is developed for a Newtonian fluid assuming a central circular void based on standard lubrication theory. Account is taken of the drop in force due to plate skewness and also the reduction in plate motion due to compliance of the test apparatus. The simple model derived is suitable when considering random oscillations where relatively small voids are predicted. For a sinusoidal input with relatively large amplitude, a bigger void is generated which prolongs the effect of cavitation. Account of this effect is taken in an extended model but to achieve adequate correspondence between simulated and experimental values of plate force it was necessary to introduce a factor reducing the flow rate from the liquid region into the void. A modified spectral technique is used for experimental analysis of nonlinear squeeze film dynamics.