The Experimental Study Of Bubbly Flow Structure In Reflux Reactor

The gas-liquid two-phase turbulent flow in a reflux reactor, which is usually used inchemical industrial production, has been studied by constant-temperature hot-filmanemometer. The velocity time sequence of different engineering cases and places in areflux reactor has been finely measured by IFA300 constant-temperature hot-filmanemometer with resolution higher than Kolmogorov scale.The energy maximal criterion is developed to auto-detect bubbly flow structures ofgas-liquid two-phase flow in a reflux reactor. The wavelet analysis is used to performthe study of multi-scale simultaneous characters in temporal space and multi-scaleenergy spectrum character of bubbly flow in gas-liquid two-phase turbulent flow. Thetemporal scale of bubbly flow structure in gas-liquid two-phase flow is determined byenergy maximal criterion of turbulence wavelet transform.A conditional sampling method is developed to auto-detect bubbly flow structures ofgas-liquid two-phase flow with the energy maximal criterion. Phased-averageevolution shapes for multi-scale are extracted from the identified bubbly flowstructures. The happening probability and flatness factor of bubbly flow structures arestudied. The happening mechanism of the typical structure of bubbly flow is analyzed.Some important parameters in gas-liquid two-phase flow such as flow velocity andgas hold-up are calculated by the velocity time sequence. The actual status of flowvelocity and gas hold-up in a reflux reactor is analyzed. Through the measurement, arule that flow velocity and gas hold-up are changed is concluded.