The application of particle tracking velocimetry as a velocity measurement technique

Within building drainage, waste and ventilation (DWV) systems, airflow measurement within and across the cross-section of the stack is problematic due to the multiphase and unsteady nature of the flow. This paper investigates the suitability for measurement of mixed-phase fluid flow in building (DWV) systems utilizing a particle tracking velocimetry (PTV) flow measurement technique. PTV is a non-intrusive optical flow measurement technique that supplies an instantaneous sample of velocity throughout a 2D plane in the flow field. The results of the PTV investigation can then be utilized for comparison with the results of previous investigations. Practical application: Development of a remote sensing technique capable of discriminating between phases in DWV stack systems would benefit researchers and code bodies by allowing more robust and comprehensive models to be developed. These models could be used in sensitivity tests for code changes. © The Chartered Institution of Building Services Engineers 2006.