{'fraction_non_alphanumeric': 0.015701668302257114, 'fraction_numerical': 0.0, 'mean_word_length': 4.930232558139535, '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}}
FOR THE ANALYSIS OF FLOW STRUCTURES IN CIRCULATING FLUIDIZED BEDS

This paper describes experiments to investigate the flow structure at the wall region of a Circulating Fluidized Bed (CFB). A high-speed video camera is used to visualize the flow structure through a transparent silica section. The usage of an image intensified camera makes it necessary to preprocess the images. The image sequences show that there is no homogenous flow of solids downward. To investigate the flow structure two different methods to estimate the velocity of the structures automatically are used. One method is gradient-based and the result is a two-dimensional field of velocities that show that there is turbulence in the flow. The fourier-based method delivers the component of the velocity in main flow direction but even here a two-dimensional field of measurements is computed. Investigations with different parameters show that at higher velocities the down-flow is slower and more upward turbulence occurs due to gas eruption.