Abstract:
Present analysis is dedicated to examine the thermal performance of engine oil in the presence of both single and multiple wall carbon nanotubes (SWCNTs and MWCNTs) between two concentric cylinders. Flow is driven with oscillatory pressure gradient and magnetohydrodynamics (MHD) effects are also introduced to control the random motion of the nanoparticles. Arrived broad, it is perceived that the inclusion of nanoparticles increases the thermal conductivity of working fluid significantly for both turbulent and laminar regimes. Fundamental momentum and energy equations are based upon partial differential equations (PDEs) that contain thermos-physical properties of both SWCNTs and MWCNTs. The solution has been evaluated for each mixture, namely: SWCNT-engine oil and MWCNT-engine oil and results are determined for each velocity, temperature, pressure and stress gradient. Graphical results for the numerical values of the emerging parameters, namely: Hartmann number , the solid volume fraction of the nanoparticles, Reynolds number , and the pulsation parameter based on the periodic pressure gradient are analyzed for pressure difference, frictional forces, velocity profile, temperature profile and vorticity phenomena. The assets of various parameters on the flow quantities of observation are investigated. To the same degree a concluding crux, the streamlines are examined and plotted for engine oil based CNTs. Womersley number and nanoparticle volume fraction demonstrate the significant effects on nanofluid flow with in the restricted domain of ducts due to dependence of dynamic viscosity. Based upon whole analysis it concludes that engine oil based SWCNTs provides higher velocity and temperature profile as compared to the engine oil based MWCNTs.
