اسلامی نظام معاشرت میں عدل اجتماعی کی اطلاقی معاشی نوعیت

There is no doubt that the economic system of Islam is stable and compassionate which is based on "Human Amity." This system and its features are utterly beneficial for humanity irrespective of their caste, creed, reigion and religion etc. The specialities of social justice that are applied in the economic field provide such comprehensive and versatile version which makes the utility of the economic system even more pertinent. The humanity can adopt this system to ensure their well-being and welfare.  More importantly, as this system is based on economic justice rather equality, which means, it’s the natural system that depends on human capacities, efforts, innate necessities and abilities. The more a man strives, the more benefit he gets. However, it also sets out the principle of financing those who try hard but stay behind in the economic race. In addition, the fundamental philosophy of this system is to protect the economic rights of the society and provides resources to everyone for equitable economic struggle, with no discrimination. The economic systems around the world suffer from inflation and precariousness, while Social Justice proves to be a remedy to the said scenarios.

Laminar Flow Enhancement in Channels With Heat Transfer Analysis

Investigation of flow and heat transfer phenomena in a channel filled partially or fully with porous medium is of significant interest as it has numerous applications in heat exchangers, crude oil extraction, jet printers, petroleum reservoir, filtration mechanism, magnetic refrigerator, rocket propulsion etc. It is observed that the pressure gradient and temperature difference play vital role in the channel and pipe flows. Also, presence of porous medium has a significant effect on heat transfer phenomenon. Theoretical analysis of such flows is helpful to examine more complex problems related to flow and heat transfer phenomena. A lot of research has been conducted in this direction. However, characteristics of heat transfer in composite channel flows are yet to be explored as a few literature is available on this topic. Keeping this in mind, emphasis has been paid on the steady of flow and heat transfer characteristics in channels partially or fully filled with porous medium. Newtonian and non-Newtonian fluid known as Casson fluid have been considered and the impact of presence of magnetic field, unsteadiness and suction/injection on fluid flow and heat transfer are observed. The considered problems are mathematically modelled using momentum and energy equations. In some particular cases, entropy generation effects are also investigated to measure the energy losses during these processes. Different techniques like numerical and analytical are used to solve partial differential equations which govern heat transfer and flow phenomena. Regular perturbation method is used to solve analytically the governing equations whereas finite difference scheme are employed to obtain the numerical solutions. The validity and accuracy level of the solutions have been determined either by comparing both the solutions or calculating the residual error. The analysis carried out in this dissertation reveals that the presence of porous medium decreases the velocity of the fluid within the pipes or composite channels. Also, it is noticed that the flow and heat transfer strongly depend on the viscosity ratios, magnetic field parameter, thermal conductivity ratios, inclination angle and porosity parameter. Moreover, the Newtonian fluid velocity is higher than the Casson fluid velocity for irregular channel with convective boundary conditions. In case of composite channel, temperature enhancement is more in porous region as compared to clear region. Furthermore, presence of porous medium, magnetic field parameter and viscous dissipation effects are the major factor responsible for entropy generation.