本文利用基于Front Tracking的3D直接数值模拟方法对高粘度流体中倾斜壁面附近上升的气泡进行了直接数值模拟,以研究气泡与壁面相互作用以及壁面附近气泡运动的机理.在不同的壁面倾斜角(10°,30°和50°)下针对Eo数分别等于0.7和10的两种典型工况计算了气泡的变形、运动轨迹和上升速度并与实验进行了对比.发现倾斜壁面使得气泡被压扁,在较大的倾斜角下气泡不对称变形程度更大、由此导致的流场不对称性也更大,表明壁面垂直方向的速度受到抑制是壁面引发升力的原因.对于不同的倾角,气泡最终都会沿着倾斜表面滑动,而且倾角越大,气泡中心越接近壁面.气泡的上升速度则随着倾角的增大而单调减小,同实验结果的对比吻合良好.
参考文献
| [1] | Kodama Y.A Full-Scale Experiment on Microbubbles for Skin Friction Reduction Using Seiun-Maru,Part 1:The Preparatory Study[J].J SOC of Naval Architects of Japan,2002(192):1-13. |
| [2] | E E Zukoski .Influence of Viscosity,Surface Tension,and Inclination Angle on the Motion of Long Bubbles in Closed Tubes[J].Journal of Fluid Mechanics,1966,25(04):821-837. |
| [3] | Maxworthy T .Bubble Rise Under an Inclined Plate[J].Journal of Fluid Mechanics,1991,229:659-674. |
| [4] | J Masliyah;R Jauhari;M Gray .Drag Coefficients for Air Bubbles Rising Along an Inclined Sureface[J].Chemical Engineering Science,1994,49(12):1905-1911. |
| [5] | H K Tsao;D L Koch .Observations of High Reynolds Number Bubbles Interaction with a Rigid Wall[J].Physics of Fluids,1997,9(01):44-56. |
| [6] | Callie E.Shosho;Michael E.Ryan .An experimental study of the motion of long bubbles in inclined tubes[J].Chemical Engineering Science,2001(6):2191-2204. |
| [7] | Ashihara M;Kitagawa A;Murai Y.Discussion on Wall Inclination Effect on Drag of Single Wall-Sliding Bubble[A].Osaka,Japan,2003 |
| [8] | B Couet;G S Strumolo .The Effects of Surface Tension and Tube Inclination on a Two-Dimensional Rising Bubble[J].Journal of Fluid Mechanics,1987,184:1-14. |
| [9] | Murray Rudman .A volume-tracking method for incompressible multifluid flows with large density variations[J].International Journal for Numerical Methods in Fluids,1998(2):357-378. |
| [10] | Lee J;Vanden-Broeck J M .Bubbles Rising in an Inclined Two-Dimensional Tube and Jets Falling Along a Wall[J].J Australian Mathematical Society Series B-Applied Mathematics,1998,39:332-349. |
| [11] | M. Cook;M. Behnia .Bubble motion during inclined intermittent flow[J].International journal of heat and fluid flow,2001(5):543-551. |
| [12] | 陈斌,T.Kawamura,Y.Kodama.静止水中单个上升气泡的直接数值模拟[J].工程热物理学报,2005(06):980-982. |
| [13] | 陈斌.高粘度流体中上升气泡的直接数值模拟[J].工程热物理学报,2006(02):255-258. |
| [14] | Takafumi Kawamura;Yoshiaki Kodama .Numerical simulation method to resolve interactions between bubbles and turbulence[J].International journal of heat and fluid flow,2002(5):627-638. |
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