Browsing by Author "Arifuzzaman, M."

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Convective flow of alumina–water nanofluid in a square vessel in presence of the exothermic chemical reaction and hydromagnetic field
(Results in Engineering, Elsevier, 2021-06) Arifuzzaman, M.; Uddin, M.J.
Nanofluids have various operations and prospects in heat transfer engineering to produce novel technological equipment for cooling purposes. In response to nanofluid's possible application, the transient convective alumina-water nanofluid flow in a square vessel in the presence of magnetic field and exothermic chemical reaction has been numerically investigated. We consider a square vessel, where the lower boundary of the vessel is heated, the two vertical side walls are relatively cold, and the upper wall is insulated. The finite element method based on Galerkin scheme is used to solve the governing partial differential equations along the imposing boundary conditions. We verified the present results with the standard experimental published results. The flow and thermal forms, and local Nusselt number are investigated for the numerous appropriate parameters. The time effects on the heat transfer is examined. The result shows that as the Rayleigh number increased from 105 to 106, the heat transfer increased by 72.78%. Compared with the base fluid water, the heat transfer of the alumina-water nanofluid with a nanoparticle volume fraction of 6% increased by 10.42%. The magnetic field and the Arrhenius chemical reaction parameters regulates the nanofluid flow and the heat transfer.
Effect of Acceptor Concentration on Performance of CdTe Solar Cell from Numerical Analysis
(IEEE, 2016-10-28) Noman, M.A.A.; M.S., Islam; Abden, M.J.; Arifuzzaman, M.; Islam, M.A.
In this study, the absorber layer of Cadmium Telluride (CdTe) ultra-thin solar cell was analyzed by using the one dimensional simulator Analysis of Microelectronic and Photonic Structures (AMPS 1D) software. A novel structure of ultra-thin CdS:O/CdTe solar cell is suggested in this research that emphases on conversion efficiency. The maximum conversion efficiency of ~ 26.24% (JSC = 27.05 mA/cm2, VOC = 1.2 V, FF = 0.886) is achieved with 600 nm CdTe absorber layer at the acceptor concentration of 5 × 1019 cm-3. The temperature effect is also examined with an aim to realize the environmental impact on performance of the cell. Our outcomes offer innovative research guidelines for resolving persistent challenges of CdTe photovoltaics.
Structural, Dielectric and Conductivity Studies of Ni-Cu-Cd Ferrite Nanoparticles
(IEEE, 2016-10-28) Arifuzzaman, M.; Abden, M.J.; Ahmed, S.K.; Belal Hossen, M.
In this study, the nanoparticles (NPs) of Ni0.6Cu0.1Cd0.3Fe2O4 (NCCF) ferrite was successfully synthesized by sol-gel auto combusted process. The effects of temperature and size on the structural, dielectric and conductivity properties of NCCF ferrite nanoparticles were investigated. X-ray diffraction (XRD) analysis of the NPs annealed at 550 and 700 ºC displayed the single phase cubic spinel structure with the particle size of 11 and 17 nm, respectively. The surface morphology of the annealed NCCF ferrite nanoparticles was studied by using field emission scanning electron microscopy (FESEM). Dielectric constant of larger particles shows higher values at low frequency as well as lower dielectric loss tangent. Ac conductivity shows conventional trend with size effects.