Axial Wall Slits Effect on the Helical Flow in the Gap between two Concentric Cylinders
Axial Wall Slits Effect on the Helical Flow in the Gap between two Concentric Cylinders
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DOI：
10.5293/ijfms.2012.5.2.060
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发表时间：
2012-06
影响因子：
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通讯作者：
Liu Dong;Y. Xiaoyong;Ding Jian;kim Hyoung-Bum
中科院分区：
文献类型：
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作者：
Liu Dong;Y. Xiaoyong;Ding Jian;kim Hyoung-Bum
利用DPIV技术研究了旋转雷诺数较小时的螺旋流场。壁面狭缝沿外筒内壁沿着方位分布，每种模型的狭缝数分别为9和18，另一种模型也进行了研究以作对比。在三种模型中都可以观察到螺旋涡的流动状态。负温度梯度决定了螺旋涡的旋转和运动方向。但螺旋波涡流动只在平面和9缝模型中出现。结果表明，缝壁的存在加速了转变过程。
The helical flow regime was investigated by using DPIV when the rotating Reynolds number is small. The wall slits were azimuthally located along the inner wall of outer cylinder and the slits number of each model was 9 and 18, another plain wall model was also studied for comparison purpose. The helical vortex flow regime can be observed in all the three models. The negative temperature gradients determine the direction of the rotation and movement of the helical vortex. But the helical wavy vortex flow can only be found in the plane and 9-slit models. And the result showed that the existence of slit wall accelerated the transition process.