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A parametric study to simulate the non‐Newtonian turbulent flow in spiral tubes
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-10-22 , DOI: 10.1002/ese3.514 Kamran Valizadeh 1 , Soroush Farahbakhsh 2 , Amir Bateni 3 , Amirhossein Zargarian 4 , Afshin Davarpanah 5, 6 , Araz Alizadeh 7 , Mojtaba Zarei 8
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-10-22 , DOI: 10.1002/ese3.514 Kamran Valizadeh 1 , Soroush Farahbakhsh 2 , Amir Bateni 3 , Amirhossein Zargarian 4 , Afshin Davarpanah 5, 6 , Araz Alizadeh 7 , Mojtaba Zarei 8
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Non‐Newtonian fluids are considered to those types of fluids that do not follow Newton's law of viscosity where viscosity would change in either more solid or liquid. The objective of this study, a parametric simulation, was performed to investigate the considerable influence of non‐Newtonian fluids on different parameters on spiral tubes. Firstly, governing equations have derived by computational fluid dynamics methods to compare the laminar and turbulent flows. Then, the turbulent flow, the non‐Newtonian flow, power law flow, and cross models are simulated according to the boundary conditions. Consequently, for the Reynolds range of 600‐2500, increasing the Reynolds number decreases the friction coefficient. It is observed that in slow flow, there is no significant difference between the results of cross and power law models. The distribution of velocity profile has slight variation at the pipe outlet for Reynolds 9000 and 20 000. In other words, the flow is constant in developed region inside the spiral pipe. Moreover, the investigation of pressure drop inside the pipe revealed that regarding the increase in Reynolds number, the friction coefficient decreases. In spiral tubes, due to the presence of secondary currents, the friction coefficient is higher than the direct tube.
中文翻译：
模拟螺旋管中非牛顿湍流的参数研究
非牛顿流体被认为是不遵循牛顿粘度定律的那些类型的流体，其粘度在更多固体或液体中都会发生变化。本研究的目的是进行参数模拟，以研究非牛顿流体对螺旋管上不同参数的巨大影响。首先，通过计算流体动力学方法推导了控制方程，以比较层流和湍流。然后，根据边界条件模拟了湍流，非牛顿流，幂律流和交叉模型。因此，对于600-2500的雷诺范围，增加雷诺数会降低摩擦系数。可以看出，在慢流量中，交叉定律和幂定律模型的结果之间没有显着差异。对于雷诺9000和20000，速度分布在管道出口处略有变化。换句话说，在螺旋管内部的展开区域中，流量是恒定的。此外，对管内压降的研究表明，随着雷诺数的增加，摩擦系数减小。在螺旋管中，由于存在次级电流，因此摩擦系数高于直接管。
更新日期：2019-10-22
中文翻译：
模拟螺旋管中非牛顿湍流的参数研究
非牛顿流体被认为是不遵循牛顿粘度定律的那些类型的流体，其粘度在更多固体或液体中都会发生变化。本研究的目的是进行参数模拟，以研究非牛顿流体对螺旋管上不同参数的巨大影响。首先，通过计算流体动力学方法推导了控制方程，以比较层流和湍流。然后，根据边界条件模拟了湍流，非牛顿流，幂律流和交叉模型。因此，对于600-2500的雷诺范围，增加雷诺数会降低摩擦系数。可以看出，在慢流量中，交叉定律和幂定律模型的结果之间没有显着差异。对于雷诺9000和20000，速度分布在管道出口处略有变化。换句话说，在螺旋管内部的展开区域中，流量是恒定的。此外，对管内压降的研究表明，随着雷诺数的增加，摩擦系数减小。在螺旋管中，由于存在次级电流，因此摩擦系数高于直接管。
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