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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >FLOW CHARACTERISTICS OF LOW CONCENTRATION NON-NEWTONIAN FLUID THROUGH A CHANNEL WITH AN OBSTRUCTION AT THE ENTRY
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FLOW CHARACTERISTICS OF LOW CONCENTRATION NON-NEWTONIAN FLUID THROUGH A CHANNEL WITH AN OBSTRUCTION AT THE ENTRY

机译：通过入口的低浓度非牛顿流体通过通道的流动特性

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摘要

The flow of Newtonian fluid (eg. water) in the test channel with an obstruction at the entrance placed in a wider channel was seen to be stagnant, forward or reverse depending on the position of the obstruction. This interesting flow phenomenon has potential benefit and can be employed in the control of energy and various flows in process engineering. This study was extended to non-Newtonian fluid for further investigation using flat plate as an obstruction. A low concentration polyacrylamide fluid solution (0.018%) showing non-Newtonian fluid behavior was used in this investigation. The parameters that affect the flow inside and around the test channel were the gap (g) between the obstruction geometry and the test channel, the Reynolds number and the length of the test channel. The maximum reverse flow inside the test channel observed was 20%-25% of the outside test channel velocity at g/w (gap to width) ratio of 1 for Reynolds number of 1000 to 3500. The results of the influence of the test channel length and the Reynolds number on the velocity ratio (Vi/Vo: inside velocity/outside velocity in the test channel) is also presented and discussed.
机译：牛顿流体（例如水）在试验通道中的流动在入口处有障碍物，而该障碍物位于较宽的信道中，视障碍物的位置而定，其流动是停滞，前进或后退。这种有趣的流动现象具有潜在的好处，可用于过程工程中的能量和各种流动的控制。这项研究扩展到非牛顿流体，以使用平板作为阻塞物进行进一步研究。本研究使用低浓度聚丙烯酰胺流体溶液（0.018％），显示出非牛顿流体行为。影响测试通道内部和周围流动的参数是障碍物几何形状和测试通道之间的间隙（g），雷诺数和测试通道的长度。当雷诺数为1000到3500时，在g / w（间隙与宽度）的比率为1时，观察到的测试通道内部的最大逆流为外部测试通道速度的20％-25％。测试通道的影响结果还给出并讨论了速度比上的长度和雷诺数（Vi / Vo：测试通道中的内部速度/外部速度）。

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