EXPERIMENTAL-STUDY OF A 2-PHASE BUBBLY FLOW IN A FLAT DUCT SYMMETRICAL SUDDEN EXPANSION .2. LIQUID AND BUBBLE VELOCITIES, BUBBLE SIZES

Experimental results obtained in a gas-liquid bubbly flow in a flat ho rizontal sudden expansion are presented in this study and constitute u seful data for the numerical code. The use of hot film anemometry in t he continuous phase (liquid) of a bubbly flow allows a determination o f the average and fluctuating velocity. For the dispersed phase, the u se of a double optical probe allows the determination of the average a nd fluctuating axial velocity and the granulometry of the bubbles. A c omparison of these quantities with the results obtained by a fast vide o camera shows very good agreement. The different measuring quantities were discussed and an organization scheme of the flow in a sudden exp ansion was proposed. Copyright (C) 1996 Elsevier Science Ltd.