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首页> 外文会议>OCEANS 2017 - Aberdeen >Impingement of NEWTONIAN and non-Newtonian dry-bed bores on a vertical structure
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Impingement of NEWTONIAN and non-Newtonian dry-bed bores on a vertical structure

机译：牛顿和非牛顿干床孔在垂直结构上的撞击

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An experimental work has been devised to investigate the bore height and velocity on a dry flatbed as well as the impingement forces acting on a vertical structure subjected to both Newtonian (water) and non-Newtonian (kaolin clay at 20% concentration) fluids using physical modelling. Rheological analysis has shown that within the observed shear rate range (10 to 500 1/s), the kaolin mixture exhibits Herschel-Bulkley characteristics and the apparent viscosity of the fluid fitted well with the Sisko model. A dam-break system has been used to generate the Newtonian and non-Newtonian bores with the help of a 45 cm fluid depth reservoir located at one end of the wave flume. The experimental results shows that the maximum wave height produced by the non-Newtonian bore experiences up to 70% wave reduction along the length of the flume, as compared to 10% wave reduction for the Newtonian bores. While both fluids are subjected to supercritical flow range, the Reynolds number otherwise shows that the Newtonian bores are within turbulent range whereas for the case of non-Newtonian, the flow is laminar. Nevertheless, the pressure exerted by the non-Newtonian laminar flow (for the submerged part of the structure) is higher compared to that of the turbulent Newtonian bore. Bore surges and runup have shown to pose great influences on the overall pressure distribution along the height of the test model to which the Newtonian bores tends to generate larger surface fluxes compared to the non-Newtonian ones.
机译：已经设计了一项实验工作，以研究干平板上的孔高度和速度，以及在垂直结构上承受牛顿（水）和非牛顿（浓度为20％的高岭土）流体的冲击力，方法是物理造型。流变学分析表明，在观察到的剪切速率范围内（10至500 1 / s），高岭土混合物表现出Herschel-Bulkley特性，并且流体的表观粘度与Sisko模型完全吻合。借助溃坝系统，借助位于波浪槽一端的45 cm流体深度储层，可以生成牛顿和非牛顿的钻孔。实验结果表明，由非牛顿孔产生的最大波高沿水槽的长度减少了70％，而牛顿孔减少了10％。当两种流体都处于超临界流动范围时，雷诺数否则表明牛顿孔在湍流范围内，而对于非牛顿的情况，流动是层流的。但是，非牛顿层流（对于结构的淹没部分）施加的压力要比湍流牛顿孔的压力高。事实表明，孔涌和上升对沿测试模型高度的整体压力分布产生了很大的影响，与非牛顿的相比，牛顿的钻孔往往会产生更大的表面通量。

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