论文部分内容阅读
为了了解水平温度梯度作用下双层流体内热毛细对流的特征,实验观察了环形池内由1cSt硅油和氟化液FC-40组成的双层流体内热毛细对流失稳后的不稳定现象。实验表明,随着上层或下层流体厚度的增加,流动稳定性减弱。当上层厚度为1.5 mm时,内外环间温差超过临界温差后在外环区域产生三维稳态的直条纹、并在内环区域产生热流体波,波纹产生于上层流体。当上层流体厚度为2mm时,液层内三维稳态直条纹占主导。环形池旋转使稳态条纹变为弯曲波纹,并且液层内只有一组传播方向与环形池的旋转方向相反的热流体波。
In order to understand the characteristics of thermal capillary convection in a two-layer fluid under the influence of horizontal temperature gradient, we observed the instability of the convective instability of the thermal capillary in a two-layer fluid composed of 1 cSt silicone oil and fluorinated fluid FC-40 in a toroidal cell. Experiments show that as the thickness of the upper or lower fluid increases, the flow stability decreases. When the thickness of the upper layer is 1.5 mm, three-dimensional steady streaks are generated in the outer ring region when the temperature difference between the inner and outer rings exceeds the critical temperature difference, and a hot fluid wave is generated in the inner ring region and the ripples are generated in the upper fluid. When the thickness of the upper fluid is 2mm, the three-dimensional steady straight stripes in the liquid layer dominate. Rotating the toroidal pool causes the steady-state streaks to become curved corrugations, and there is only one stream of hot fluid in the layer that propagates in the opposite direction of rotation of the toroidal pool.