Author's Declaration I, Rabil Tabassum, 13-PhD-MT-003 hereby state that my PhD thesis titled "Ste... more Author's Declaration I, Rabil Tabassum, 13-PhD-MT-003 hereby state that my PhD thesis titled "Steady Flow of Fluids with Variable Viscosity" is my own work and has not been submitted previously by me for taking any degree from HITEC University, Taxila. Or anywhere else in the country/world. At any time if my statement is found to be incorrect even after my Graduate the university has the right to withdraw my PhD degree.
In this study, we discussed the enhancement of thermal conductivity of elasticoviscous fluid fill... more In this study, we discussed the enhancement of thermal conductivity of elasticoviscous fluid filled with nanoparticles, due to the implementation of radiation and convective boundary condition. The flow is considered impinging obliquely in the region of oblique stagnation point on the stretching surface. The obtained governing partial differential equations are transformed into a system of ordinary differential equations by employing a suitable transformation. The solution of the resulting equations is computed numerically using Chebyshev spectral newton iterative scheme. An excellent agreement with the results available in literature is obtained and shown through tables. The effects of involving parameters on the fluid flow and heat transfer are observed and shown through graphs. It is importantly noted that the larger values of Biot number imply the enhancement in heat transfer, thermal boundary layer thickness, and concentration boundary layer thickness.
Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2017
The dynamic properties of nanofluids have made them an area of intense research during the past f... more The dynamic properties of nanofluids have made them an area of intense research during the past few decades. In this article, flow of nonaligned stagnation point nanofluid is investigated. Copper–water based nanofluid in the presence of temperature-dependent viscosity is taken into account. The governing nonlinear coupled ordinary differential equations transformed by partial differential equations are solved numerically by using fourth-order Runge–Kutta–Fehlberg integration technique. Effects of variable viscosity parameter on velocity and temperature profiles of pure fluid and copper–water nanofluid are analyzed, discussed, and presented graphically. Streamlines, skin friction coefficients, and local heat flux of nanofluid under the impact of variable viscosity parameter, stretching ratio, and solid volume fraction of nanoparticles are also displayed and discussed. It is observed that an increase in solid volume fraction of nanoparticles enhances the magnitude of normal skin frict...
Oblique radiative solar nano-polymer gel coating heat transfer and slip flow: manufacturing simulation
In the current work we study numerically the time-independent twodimensional, non-aligned (obliqu... more In the current work we study numerically the time-independent twodimensional, non-aligned (oblique) slip flow of copper metal-doped water-based nano-polymeric sol gels under radiative heat flux. Reynolds temperature-dependent viscosity model is employed for the solar coating rheology. The Tiwari-Das nanofluid volume fraction model and Maxwell-Garnet model are used to simulate nanofluid thermal conductivity. The transformed ordinary differential conservation equations are solved with the Runge-Kutta-Fehlberg scheme and shooting quadrature in MATLAB symbolic software. Validation of solutions is conducted with a Variational Iterative Method (VIM). The response in non-dimensional normal and tangential velocity components, temperature, wall shear stress, local heat flux and streamline distributions to variation in obliqueness parameter, radiation-conduction Rosseland number, thermal slip parameter, Reynolds viscosity parameter, nanoparticles volume fraction is described and interpreted a...
Smart fluids are the fluids whose properties can be changed by applying an electric or a magnetic... more Smart fluids are the fluids whose properties can be changed by applying an electric or a magnetic field. Such type of fluid finds tremendous applications in electronic devices, semi-active dampers, magnetic resonance imaging, in space craft propulsion and many more. This communication addresses water based magneto ferrofluid striking at a stretching surface in an oblique manner. In order to present physically realistic analysis, viscosity is assumed to be dependent upon temperature as well as volume fraction of magnetite nanoparticle. The flow governing problem is altered into nonlinear coupled system of ordinary differential equations via scaling transformation which is then solved numerically by means of Runge-kutta Fehlberg scheme. Impact of sundry parameters such as magnetic field parameter, nanoparticle volume fraction, heat generation parameter and variable viscosity parameter on velocity and temperature profile of magneto ferrofluid is presented graphically and discussed in a physical manner. Practical measures of interest namely skin friction and heat flux at the surface are computed. Streamline patterns are traced out to examine the flow pattern. It is found that skin friction and rate of heat transfer at the wall enhances by strengthening the applied magnetic field. Local heat flux can also be enhanced with increasing the volume fraction of magnetite nanoparticles.
Transport theories in porous media are quite operative to analyse heat transferral phenomenon in ... more Transport theories in porous media are quite operative to analyse heat transferral phenomenon in biological tissues, reducing bio convective flow instabilities by means of porous media and many more. Inspired by these remarkable features, the present study is conducted to analyse heat transfer phenomenon for obliquely striking nanofluid through a porous media. Copper (Cu) nanoparticles are suspended in traditional Hydrogen Oxide based fluid. Scaling group of transformations is conveniently employed to reduce governing transport equations and is tackled numerically afterwards. Influence of nanoparticles volume fraction, stretching ratio and porosity parameter on physical measures of concern such as normal and tangential skin friction and corresponding heat flux at wall is portrayed. Streamline patterns are traced out to discover the influence of porosity factor on actual flow behavior. It was observed that solid volume fraction of copper nanoparticles enhanced the skin friction coefficients and heat flux. Increasing the porosity parameter leads to greater heat flux and tangential skin friction co-efficient.
Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2019
Manufacturing of modern coating materials doped with magnetic nanoparticles has arisen as an exci... more Manufacturing of modern coating materials doped with magnetic nanoparticles has arisen as an exciting new area of materials processing fluid dynamics. Methanol is primarily used in chemical manufacturing, specialized vehicles fuel, energy carrier, as an antifreeze in pipelines, in wastewater treatment plant, and many more. In this article, a mathematical model is therefore developed to study crosswise flow of methanol-based ferromagnetic fluid through a permeable medium with suction/injection effects. Temperature-dependent viscosity is taken with Reynolds exponential model. The Tiwari–Das and Maxwell–Garnett nanofluid models are used, which alters the electrical conductivity, density, and thermal conductivity properties with nanoparticle volume fraction. The two-dimensional mass, momentum, and energy equations are normalized into nonlinear system comprising ordinary differential equations via appropriate similarity transformations. The solution of the emerging physical problem is at...
Ti t l e Th e r m al sli p in o bliq u e r a di a tiv e n a n o-p oly m e r g el t r a n s p o r ... more Ti t l e Th e r m al sli p in o bliq u e r a di a tiv e n a n o-p oly m e r g el t r a n s p o r t wi t h t e m p e r a t u r e-d e p e n d e n t vis co si ty : s ol a r c oll e c t o r n a n o m a t e ri al c o a ti n g m a n uf a c t u ri n g si m ul a tio n
Uploads
Papers by Rabil Tabassum