an experimental set-up for investigating swirling decaying flow in an annular pipe

this work presents the design of an experimental set-up for swirling decaying flow investigations, alongside validation experiments and preliminary experimental work. the combinations of possible investigations using such an apparatus are limitless. as a means of validation, a series of flow visualisation images for pipe flow are presented. in addition to that, the design of the axial swirl vanes used in the study was also disclosed, alongside flow visualisation images and steady and unsteady heat transfer results. experimental validation was conducted using the dye seeding method. results show that the fully laminar and turbulent regime is similar to published results. streak-lines produced for swirling decaying flow are clear and easily captured using normal digital cameras.