Effects of Nanoparticle Shapes on SiO2-engine Oil Nanofluid Flow and Heat Transfer Over a Stretchable Rotating Disk

In the present study, we considered the flow and heat transfer of SiO2-engine oil nanofluid on a radially stretching rotating disk, and the effects of the shape of SiO2 nanoparticles are studied. Traditional von Kármán transformations are applied to simplify the governing differential equations. The solutions of the resulting ordinary differential equations are obtained numerically by the BVP4C, a MATLAB built-in function, and the impact of stretching parameter for five different shaped SiO2 nanoparticles (sphere, cylinder, blade brick, and platelet) are examined. Additionally, on velocity and temperature fields, the effects of volume fraction are analyzed and the impact of stretching parameter on the skin friction coefficient and Nusselt number for different shapes of SiO2 nanoparticles are also studied. For validation, the equations are also solved by the spectral local linearization (SLLM) method. The results obtained using both the techniques are compared with the previously published data, which further shows the accuracy of our solutions.