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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Influence of surface roughness on multidiffusive mixed convective nanofluid flow
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Influence of surface roughness on multidiffusive mixed convective nanofluid flow

机译：表面粗糙度对多抗动混合对流纳米流体流动的影响

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The main objective of this work is to investigate the mixed convective nanofluid flow along a slender cylinder with a rough surface in the presence of liquid hydrogen and ethanol diffusions. The surface roughness is represented by a deterministic model with low-amplitude high-frequency sinusoidal variations. The governing equations of the flow are expressed in the form of dimensional nonlinear partial differential equations and are solved with the help of non-similar transformations and the numerical technique of quasilinearization. The so obtained non-dimensional linear partial differential equations are discretized by implementing an implicit finite difference scheme for the computation of a numerical solution. The numerical study focuses on the analysis of rough surface effects regarding small parameter alpha and frequency parameter n along with the effects of velocity ratio parameter epsilon. The sinusoidal variations observed in the values of the gradients with their mean values are closely identified with values corresponding to a smooth surface. Also, increasing the slender cylinder's wall roughness increases the magnitude of sinusoidal variations in all the gradients. The addition of nanoparticles into the working fluid reduces the surface friction and transfer of heat, but increases the transfer of mass for both a smooth or rough surface. The presence of thermophoresis and Brownian diffusion causes an increase in the thermal boundary layer. The diffusions of liquid hydrogen and ethanol are considered, and the impact of surface roughness is significant on the mass transfer rates of these liquid gases. Also, the species concentration profiles are higher for liquid hydrogen diffusion as compared to that for ethanol. The effect of the velocity ratio parameter epsilon is to increase the magnitudes of the velocity profile as well as the heat and mass transfer rates but to decrease the species concentration profile and the skin-friction coefficient. Moreover, high
机译：这项工作的主要目的是研究沿着细长圆筒的混合对流纳米流体流，在液态氢气和乙醇扩散的存在下具有粗糙表面。表面粗糙度由具有低振幅高频正弦变化的确定性模型表示。流动的控制方程以尺寸非线性偏微分方程的形式表示，并借助于非相似的变换和QuasilineAlearization的数值来解决。通过实现用于计算数值解决方案的隐含有限差分方案来离散化所获得的非维度线性部分微分方程。数值研究侧重于分析关于小参数α和频率参数n的粗糙表面效应以及速度比参数ε的效果。以其平均值的梯度值观察到的正弦变化与对应于光滑表面的值密切相关。而且，增加细长气缸的壁粗糙度增加了所有梯度的正弦变化的大小。将纳米颗粒添加到工作流体中降低了表面摩擦和热量的转移，但增加了质量的转移，用于光滑或粗糙的表面。耐热度和褐色扩散的存在导致热边界层的增加。考虑液体氢和乙醇的扩散，并且表面粗糙度的影响对于这些液体气体的质量传递速率显着。而且，与乙醇相比，物质浓度型材较高，对于液体氢气扩散较高。速度比参数epsilon的效果是增加速度曲线的大小以及热量和传质速率，而是降低物种浓度曲线和皮肤摩擦系数。而且，高

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