An Experimental Study on the Flow Instability and Wall Shear Stress along a Confined Obstacle
Open AccessReusable medical devices are widely used in medical offices and hospitals, however, inadequate cleaning can be fatal to patients. Over the years, the geometry of reusable medical devices has become more complex, with lumens or crevices, making thorough cleaning challenging. To facilitate the deployment of Computational Fluid Dynamics (CFD) analysis in the design of reusable devices and guarantee their reprocessing, it is necessary to first assess the quality and adequacy of the numerical models for such flow configurations. However, to date experimental validation data are missing and the small geometrical features make it challenging to resolve velocity field experimentally. Here, a long-distance micro-PIV is deployed on the flow along a confined obstacle in a refractive index matched facility. The confined obstacle is a canonical geometry for validation of CFD applied to reusable geometries. A jet enters a square test section and creates a flow around an obstacle. Twenty measurement stations around the obstacle provide a comprehensive coverage of the flow field. Specifically, mean and fluctuating velocities are acquired and analyzed. Specific flow features are identified by employing a combination of techniques, such as correlation analysis, proper orthogonal decomposition, etc. Recommendations for future work to better characterize this new flow are also provided.
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