Abstract
A non-intrusive flow visualization method called photochromic dye activation (PDA) technique has been used to investigate flow structures and mechanisms in wavy-stratified and annular flows in a horizontal channel and wavy falling films in countercurrent annular flow in a vertical tube. This non-intrusive flow visualization technique utilizes light activation of a photochromic dye material dissolved in a clear liquid and is a molecular tagging technique, requiring no seed particles. It has been used to yield both quantitative and qualitative flow data in the liquid phase in wavy-stratified, annular and countercurrent annular flows.
Volume Subject Area:
Gas Liquid Flows in Fluid Mechanics and Heat Transfer
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Copyright © 1997 by The American Society of Mechanical Engineers
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