Flow analysis of a concentric cylinders of Oxygen sensor module

The flow field around concentric cylinders for oxygen sensor was visualized by particle image velocimetry and CFD. Two different size of transparent acrylic models were used and measurements were carried out by room temperature air with micro-capsule as tracer. The quantitative visualization resulted that the flow direction within the internal shrouds is opposed to the external main flow while that of within the external shrouds is not. The velocity magnitude of the internal flow was significantly lower than that of the main flow. The throughput of the concentration fluctuation is enhanced by the higher velocity fluctuation around the side apertures that contribute to the quick response of the entire sensor module. And the numerical simulation also showed the similar mean flow field with experimental result.