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- 저자 : Umair Azhar (검색결과 2 건)
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Umair Rashid,Azhar Iqbal,Haiyi Liang,Jamshid ul Rahman 한국자기학회 2020 Journal of Magnetics Vol.25 No.3
The objective of present study is to examine the effects of nanoparticles shapes on magnetohydrodynamic (MHD) boundary layer flow and heat transfer of nanofluid over a flat plate in the presences of thermal radiation. Three categories of fluids such as pure water, ethylene glycol and engine oil with Prandtl number (Pr) = 7.8 containing three different shapes of Gold (Au) nanoparticles i.e. sphere, platelet and lamina have used in this study. By using unique similarity transformation, the governing partial differential equations (PDEs) are converted into a system of non-linear ordinary differential equations (ODEs) which have tackled numerically by bvp4c program. The behaviours of several pertinent parameters i.e. solid volume fraction (φ), magnetic field (M) and thermal radiation (Rd) for different shapes of nanoparticles also elucidated in detail. The results indicated that all selected parameters have a significant impact on the thermal boundary layer. The Nusselt number is presented in graphically form. The nanoparticles of sphere shape in Au-Ethylene glycol are more significant for temperature disturbance. The heat transfer rate has found greater for lamina shapes in Au- Engine oil.
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Muhammad Altaf Nazir,Tayyaba Najam,Muhammad Sohail Bashir,Muhammad Sufyan Javed,Muhammad Aswad Bashir,Muhammad Imran,Umair Azhar,Syed Shoaib Ahmad Shah,Aziz ur Rehman 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.1
The use of highly efficient, environment-friendly and economically inexpensive materials for the adsorption removal of contaminants from water has always been considered as emerging task. In this study, we synthesized hybrid tri-metallic nickel cobalt layered double hydroxide (NiCoAl-LDH) porous material for the adsorption removal of Eosin yellow (EY) and Malachite green (MG) from water. The characterization results disclosed that tri-metallic LDH has been synthesized with extraordinary purity, identical morphology and high surface area (134.21 m2·g−1). The NiCoAl-LDH performs the best for adsorption of EY (qe=37.30mg·g−1 at pH=2) and MG (qe=39.61 mg·g−1 at pH=10). The Langmuir and Freundlich isotherm models were applied to explain the adsorption process of dyes on the surface of LDH. The Langmuir model (R2=0.991 and 0.999 for Eosin Y and Malachite G, respectively) was very appropriate to explain the process of adsorption on NiCoAl-LDH as homogeneous (monolayer). The maximum adsorption capacity of EY and MG calculated with Langmuir model was 78.74 and 110.13 mg·g−1 at 30 °C, respectively. Also with 240 minutes contact time 94.8% EY and 89.9% MG was adsorbed by as synthesized NiCoAl-LDH nanosheets. The NiCoAl-LDH nanosheets showed excellent performance of reusability of up to five regeneration cycles. The results showed that the adsorption capacity of NiCoAl-LDH nanosheets after five regeneration cycles, to adsorb EY, decreased only from 40.80 to 36.93 mg·g−1 and that of MG from 79.21 to 75.42 mg·g−1, which is acceptable. The overall results Suggest that the fabricated NiCoAl-LDH is favorable for the purification of dye contaminated water.
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