Development of the micro-pillar shear stress sensor MPS3 for turbulent flows

Autor*innen

• Sebastian Große

Parameter

• Lehrbücher
• Universitätslehrbücher

Mehr zum Buch

Wall-shear stress arises from the relative motion of fluid over a surface due to the no-slip condition near the wall. Accurately determining two-dimensional wall-shear stress is crucial for both theoretical and applied turbulence research. Despite various proposed techniques, measuring the planar distribution of wall-shear stress remains a challenge in experimental fluid mechanics. This thesis presents the development of the Micro-Pillar Shear-Stress Sensor (MPS 3), which can measure the two-dimensional dynamic wall-shear stress distribution in turbulent flows. The sensor features flexible micro-pillars that extend into the near-wall region and bend in response to drag forces. The deflection of these pillars is detected optically and correlates with local wall-shear stress. This technique allows for extremely high spatial resolutions, and the successful measurement of wall-shear stress distribution has been demonstrated with up to 1000 pillars. The sensor offers low flow interference and is relatively easy to mount. Depending on its geometry and material properties, it can resolve turbulent scales below 50 μm and time scales in the kHz range. These attributes make this innovative technology an effective method for visualizing and measuring the planar turbulent wall-shear stress distribution in its two wall-parallel components.

• Sprache: Englisch
• Erscheinungsdatum: 2008
• Einband: Paperback