Experimental study on flow control of the turbulent boundary layer with micro-bubbles

Peng-Long Zhao; Yao-Hui Chen; Gang Dong; Yi-Xin Liu; Xu-Jian Lyu

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Experimental study on flow control of the turbulent boundary layer with micro-bubbles

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The effect of micro-bubbles on the turbulent boundary layer in the channel flow with Reynolds numbers (Re) ranging from 0.87 × 105 to 1.23 × 105 is experimentally studied by using particle image velocimetry (PIV) measurements.The microbubbles are produced by water electrolysis.The velocity profiles,Reynolds stress and instantaneous structures of the boundary layer,with and without micro-bubbles,are measured and analyzed.The presence of micro-bubbles changes the streamwise mean velocity of the fluid and increases the wall shear stress.The results show that micro-bubbles have two effects,buoyancy and extrusion,which dominate the flow behavior of the mixed fluid in the turbulent boundary layer.The buoyancy effect leads to upward motion that drives the fluid motion in the same direction and,therefore,enhances the turbulence intense of the boundary layer.While for the extrusion effect,the presence of accumulated micro-bubbles pushes the flow structures in the turbulent boundary layer away from the near-wall region.The interaction between these two effects causes the vorticity structures and turbulence activity to be in the region far away from the wall.The buoyancy effect is dominant when the Re is relatively small,while the extrusion effect plays a more important role when Re rises.

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《力学学报：英文版》 |2018年第005期|830-838|共9页
作者
Peng-Long Zhao; Yao-Hui Chen; Gang Dong; Yi-Xin Liu; Xu-Jian Lyu;
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作者单位

Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China;

Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China;

Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China;

Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China;

School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;

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Experimental study on flow control of the turbulent boundary layer with micro-bubbles

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