Yazar "Alam, Mohammad Mahtab" seçeneğine göre listele

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    Central composite design (CCD)-Response surface methodology (RSM) for modeling and simulation of MWCNT-water nanofluid inside hexagonal cavity: Application to electronic cooling
    (Elsevier, 2023) Wang, Jianfeng; Khan, Shan Ali; Yasmin, Sumeira; Alam, Mohammad Mahtab; Liu, Haihu; Farooq, Umar; Akguel, Ali
    Purpose: In application of hexagonal shapes, engineers and researchers use mathematical modeling, computational fluid dynamics (CFD), and experimental techniques to study natural convection inside hexagonal cavities and improve the design and efficiency of engineering systems. The exploration of fluid performance in hexagonal cavity has been an important problem from the earlier in the fluid mechanics field. The present transient study about thermal reaction and behavior of natural convectional MWCNT-water nanofluid flow privileged a hexagonal cavity in the occurrence of magnetic field is scrutinized. The flow domain of hexagonal structure cavity is a partitioned with lower heated cavity wall and inner four blocks are also heated. The upper wall of the cavity is considered insulated. Furthermore the other remaining walls of the hexagonal cavity are cold.Approach: The two-dimensional steady, incompressible, governing equations which involve continuity, velocity, and temperature equations of mono nanofluid in a dimensionless form are expressed in vertically and horizontal directions respectively. Moreover, transformed the governing equations into their dimensionless system then elucidated numerically with the help of Galerkin Finite Element Method. Furthermore response surface methodology (RSM) has been utilized to obtaining the optimal values of the designed parameters. This combined process was successfully sculpted and optimized utilized a central composite design with response surface methodology.Findings: The numerical fallouts of the flow controlling parameters scrutinized containing streamlines, velocities components and isotherms are elaborated. The investigation depicts enhanced convection velocity and temperature outcomes for different values of Rayleigh number. The average Nusselt number is drops as Rayleigh number boosts up. It is concluded that the Nusselt number is reduces for Hartmann number. For larger nanoparticles fraction Nusselt number increases.Limitations: This analysis has particular scope for improvement. In additions, studies can be showed on the improvement of hexagonal cavity walls designs, thickness, and size of the walls of enclosure cavity. Furthermore the heated blocks are involved inside the cavity.Practical application: The natural convection flow through hexagonal cavity reveals major importance and those geometrical shapes are playing major role in electronic cooling. In electronics, hexagonal cavities can be found in heat sinks and electronic packages. Natural convection plays a crucial role in dissipating heat from electronic devices, such as microprocessors, power electronics, and LED lighting systems. Nanofluids exhibit potential heat transfer as compared to conventional coolants. With this aim, the current analysis enlightens the natural convection flow of MWCNTs-water nanofluid inside hexagonal cavity and square-shaped blocks.Originality: This analysis is original, and no previous investigation has been accompanied considering the enclosure domain of cavity and variation of the walls number.
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    Dynamical study of a novel 4D hyperchaotic system: An integer and fractional order analysis
    (Elsevier, 2023) Iskakova, Kulpash; Alam, Mohammad Mahtab; Ahmad, Shabir; Saifullah, Sayed; Akguel, Ali; Yilmaz, Guelnur
    In this article, a new nonlinear four-dimensional hyperchaotic model is presented. The dynamical aspects of the complex system are analyzed covering equilibrium points, linear stability, dissipation, bifurcations, Lyapunov exponent, phase portraits, Poincare mapping, attractor projection, sensitivity and time series analysis. To analyze hidden attractors, the proposed system is investigated through nonlocal operator in Caputo sense. The existence of solution of the system in fractional sense is studied by fixed point theory. The stability of fractional order system is demonstrated via Matignon stability criteria. The fractional order system is numerically studied via newly developed numerical method which is based on Newton polynomial interpolation. The evolution of the attractors are depicted with different fractional orders. For few fractional orders, some hidden strange chaotic attractors are observed through graphs. Theoretical and numerical studies demonstrate that this model has complex dynamics with some stimulating physical characteristics. To verify and validate the results, we implement Field Programmable Analog Arrays (FPAA).(c) 2023 International Association for Mathematics and Computers in Simulation (IMACS). Published by Elsevier B.V. All rights reserved.
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    Numerical analysis of magneto-radiated annular fin natural-convective heat transfer performance using advanced ternary nanofluid considering shape factors with heating source
    (Elsevier, 2023) Adnan; AlBaidani, Mashael M.; Mishra, Nidhish Kumar; Alam, Mohammad Mahtab; Eldin, Sayed M.; AL-Zahrani, Asla A.; Akgul, Ali
    Applications: The fins performance under natural convection is essential to make it more functional for large scale applications more specifically in thermal engineering. For this, it is important to introduce new techniques to enhance the fins performance instead of traditional way. Thus, this study introduces a new way to make the fin more efficient using ternary nanomaterial under nanoparticles shape factor. The annular fin significantly contributes in electronics to exhaust the hot air, injector pumps and applied thermal engineering.Purpose: and Methodology: This work focuses on the fin energy model using shape factors. Therefore, the ternary nanofluid, natural convection, thermal radiation and magnetic field used to develop the model. Then, the RKF-45 implemented to investigate physical results.Core findings: Keen analysis of the physical results reveal that the coefficient of thermal conductivity ranging from 0.0% < alpha 1 < 3.0% and natural convection have major role in the fins energy performance. Induction of magnetic field and thermal radiation Rd are reliable for the fin cooling and, heating source Q1 = 0.2,0.4,0.6,0.8 promote the fin energy capability in the existence of (Al2O3-CuO-Cu) ternary nanomaterial with concentration factor up to 2%. On the comparative basis, ternary nanomaterial makes the fin more efficient than hybrid nanomaterial.