2-PHASE FLOW MEASUREMENTS USING A PHOTOCHROMIC DYE ACTIVATION TECHNIQUE

A novel flow visualization method called photochromic dye activation ( PDA) technique has been used to investigate flow structures and mechan isms in various two-phase flow regimes. This non-intrusive flow visual ization technique utilizes light activation of a photochromic dye mate rial dissolved in a clear liquid and is a molecular tagging technique, requiring no seed particles. It has been used to yield both quantitat ive and qualitative flow data in the liquid phase in annular flow, slu g flow and stratified-wavy flows. (C) 1998 Elsevier Science S.A. All r ights reserved.