LOCAL MEASUREMENTS IN TURBULENT BUBBLY FLOWS

Local measurements methods in bubbly flows are discussed. Concerning l iquid velocity measurement, problems linked to HFA and LDA are first a nalysed. Then simultaneously recorded velocity signals obtained by bot h anemometers are compared. New signal processing is developed for the two techniques. Bubble sizes and velocities measurements methods usin g intrusive double optical sensor probe are presented. Plane bubbly mi xing layer has been investigated. Local measurements using the describ ed methods are presented as examples. (C) 1998 Elsevier Science S.A. A ll rights reserved.