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Rotational nanofluids for oxytactic microorganisms with convective boundary conditions using bivariate spectral quasi-linearization method
Journal of Central South University ( IF 4.4 ) Pub Date : 2020-04-15 , DOI: 10.1007/s11771-020-4334-x
Mlamuli Dhlamini , Hiranmoy Mondal , Precious Sibanda , Sandile Motsa

In this study, we considered the three-dimensional flow of a rotating viscous, incompressible electrically conducting nanofluid with oxytactic microorganisms and an insulated plate floating in the fluid. Three scenarios were considered in this study. The first case is when the fluid drags the plate, the second is when the plate drags the fluid and the third is when the plate floats on the fluid at the same velocity. The denser microorganisms create the bioconvection as they swim to the top following an oxygen gradient within the fluid. The velocity ratio parameter plays a key role in the dynamics for this flow. Varying the parameter below and above a critical value alters the dynamics of the flow. The Hartmann number, buoyancy ratio and radiation parameter have a reverse effect on the secondary velocity for values of the velocity ratio above and below the critical value. The Hall parameter on the other hand has a reverse effect on the primary velocity for values of velocity ratio above and below the critical value. The bioconvection Rayleigh number decreases the primary velocity. The secondary velocity increases with increasing values of the bioconvection Rayleigh number and is positive for velocity ratio values below 0.5. For values of the velocity ratio parameter above 0.5, the secondary velocity is negative for small values of bioconvection Rayleigh number and as the values increase, the flow is reversed and becomes positive.



中文翻译:

双变量谱拟线性化方法用于对流边界条件下含氧微生物的旋转纳米流体

在这项研究中,我们考虑了旋转的粘性,不可压缩的导电纳米流体的三维流动,该纳米流体具有趋化性微生物和漂浮在流体中的绝缘板。本研究考虑了三种情况。第一种情况是当流体拖曳板时,第二种情况是当板拖曳流体时,第三种情况是板以相同速度漂浮在流体上。当它们随着流体中的氧气梯度游向顶部时,密度较大的微生物会产生生物对流。速度比参数在此流动的动力学中起关键作用。将参数更改为低于临界值或高于临界值会改变流动的动力学。哈特曼数,对于高于和低于临界值的速度比值,浮力比和辐射参数对次级速度具有相反的影响。另一方面,对于高于和低于临界值的速度比值,霍尔参数对一次速度有相反的影响。生物对流瑞利数降低了初速度。次级速度随着生物对流瑞利数值的增加而增加,并且对于低于0.5的速比值是正的。对于速度比参数的值大于0.5,对于较小的生物对流瑞利数,次级速度为负,并且随着该值的增加,流量反向并变为正。另一方面,对于高于和低于临界值的速度比值,Hall参数对一次速度有相反的影响。生物对流瑞利数降低了初速度。次级速度随着生物对流瑞利数值的增加而增加,并且对于低于0.5的速比值是正的。对于速度比参数的值大于0.5,对于较小的生物对流瑞利数,次级速度为负,并且随着该值的增加,流量反向并变为正。另一方面,对于高于和低于临界值的速度比值,霍尔参数对一次速度有相反的影响。生物对流瑞利数降低了初速度。次级速度随着生物对流瑞利数值的增加而增加,并且对于低于0.5的速度比值为正。对于速度比参数的值大于0.5,对于较小的生物对流瑞利数,次级速度为负,并且随着该值的增加,流量反向并变为正。

更新日期:2020-04-15
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