Quantitative visualization of Taylor-Couette flow with helical protrusion using optical and ultrasound imaging method
S.J. KIM1, X.C. TU1, H.B. KIM1, 2
1.School of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinju, Gyeongnam 660-701, Republic of Korea; 2.Research Center for Aircraft Parts Technology, Gyeongsang National University, Jinju, Gyeongnam 660-701, Republic of Korea
摘要 The simplified flow of drilling process in the soil hardening or oil rig site was experimentally investigated. Two flow models were used in this study. One is the concentric cylinders with helical protrusion at the inner cylinder. The other is the concentric plain wall cylinders with axial flow. The radius ratio and aspect ratio of both models are the same with 065 and 48, respectively. The mud is the typical fluid seen in the soil hardening processes. We used not only the water and but also the mud for the working fluid in this study. We used the optical PIV for the water flow measurement and echo PIV for the mud flow. In case of the water study, the dominant vortical structures appeared in both the protrusion and plain model with axial flow. In case of mud flow, the vortices shown in the water model disappeared and the push and pullup motion by the protrusion is dominant. We believe this information can be useful to understand the flow physics of drilling process in the complex fluid flow.
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