نشرا لطیب فی ذکرالنبی الحبیب ﷺ کاتعارف و منہج؛ ایک تجزیاتی مطالعہ An Analytical Study of the

Sira of the Holy Prophet ﷺ is the only subject that can quench the thirst of every subject in the universe and guarantee the solution of every problem. Love and Obedience to the Holy Prophet (peace and blessings of Allah be upon him) is a must. Mawlana Ashraf Ali Thanwi ranks high in the list of biographers through his famous book "Nashr al-Tīb" in remembrance of the Beloved Prophet (May God bless him and his family and grant them peace) which is comprehensive enough to do its function. The book is one of his excellent works in its own way. It is a valuable book in Urdu language which has been presented in an unparalleled manner. It shows the love of the Holy Prophet ﷺ as well as his teachings; mysteries and secrets which is Narrated in the style of Mathnavi Maulana Rum. In the said article, the introduction and method of " Nashr al-Tīb fi Zikr-un-Nabi Al-Habib" will be presented. In order to know the services and style of writing and purpose of Mawlana in Sira Nigari and the only purpose of Sira Nigari is to achieve love of of the Holy Prophet and obedience to Him ﷺ.

Computational Fluid Dynamics Modeling and Simulation of Hollow Fiber Membrane Contactors for Liquid-Liquid Extraction

Dispersion-free membrane-based Liquid-Liquid Extraction (LLE) is an emerging technique to recover a variety of solutes from aqueous streams. The process employs a Hollow Fiber Membrane Contactor (HFMC) that accomplishes the mass transfer between feed and solvent without any dispersion. Compactness of the unit, known and higher interfacial area, less solvent loss and independent control of operating flowrates are benefits of the process that make it attractive for researchers. Fluid dynamics and mass transport modeling of HFMC for dispersion free LLE process has been given the most attention in recent years. In the current study, numerical model has been developed to explore the dispersion free LLE processes. Extraction of copper (II) and aroma compounds from aqueous streams was taken as case study for the validation of the model.Copper (II) was extracted with trifluoro-acetylacetone (TFA) in commercially available HFMCs’ modules from LiquiCelTM (USA). A 2D model was developed for convection-diffusion mass and momentum transfer using continuity and Navier-Stokes equations. The model was simulated with Computational Fluid Dynamics (CFD) technique to study copper (II) extraction. The MatlabTM and COMSOL MultuphysicsTMsoftwares were used as simulation tools. The codes developed in MatlabTM were coupled with COMSOL MultiphysicsTM for recycled based dynamic system. Model was validated with experimental data and simulation was run to check effects of hydrodynamics conditions on contactor performance. Simulations were performed under various operating parameters and membrane geometrical characteristics in order to determine solute extraction efficiency, distribution profiles of copper (II) concentration, flux and velocity in 2-D. CFD model was then extended to investigate the extraction of four aroma compounds. These compounds have been recovered from aqueous solutions with hexane as an organic solvent in HFMC. Another model, which is based on resistance-in-series approach was also applied to study the extraction of copper (II). After validation with experimental results from the literature, the model was run to investigate the distribution of copper (II) at interface, transmembrane flux and height of transfer unit (HTU). The study revealed that an integrated mathematical model and numerical simulations can be effectively applied for the optimum design of membrane-based extraction processes.