Study on hydrodynamic mixing and bubble motion near the corner in a narrow rectangular channel
Flow and heat transfer in a narrow rectangular channel is becoming increasingly important in many diverse applications. In order to sufficient understand hydrodynamic mixing near the corner in a narrow rectangular channel having the gap of 2.2mm, flow field near the corner is studied experimentally and numerically. The experimental results show that hydrodynamic mixing near the corner is relative to Re, which only exists in turbulent flow, the Re of transition point, where hydrodynamics mixes from disappear to appear, is about 1900. The numerical results show that there are two symmetrical vortexes near the corner in turbulent flow, whose center is about lmm from the narrow side, and there is a maximal transverse velocity which is about 0.87mm from the narrow side. Hydrodynamic mixing increases with increasing Re, but the center of the vortex is almost not changed with increasing Re. The effect of the heating mode on flow field near the corner is negligible, which is mainly controlled by the hydrodynamic condition. Bubble behaviors between the un-heating and heating region near the corner are very complex, three motive mechanisms of the bubbles are visual observed: (1) the bubble slides along the surface at the vertical direction; (2) the bubble slides along the surface towards the corner; (3) the bubble slides along the surface towards the center of the channel. The motive diversities of the bubbles contribute to enhance heat transfer between the unheating and heating region near the corner in a narrow rectangular channel.
Narrow Rectangular Channel Hydrodynamic Mixing Bubble Dynamics
J.J.Xu B.D.Chen X.J.Wang
National Key Laboratoiy of Bubble Physics & Natural Circulation, Nuclear Power Institute of China Chengdu, Sichuan, 610041, P.R.China
国际会议
西安
英文
680-685
2009-07-11（万方平台首次上网日期，不代表论文的发表时间）