Nor Ashikin Abu Bakar
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Nor Ashikin Abu Bakar
Official Name
Nor Ashikin, Abu Bakar
Alternative Name
Bakar, N. A.A.
Bakar, Nor Ashikin Abu
Abu Bakar, N.
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Scopus Author ID
56286797000
Researcher ID
AAM-1480-2021

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  • Publication
    Nanofluid stagnation-point flow using Tiwari and Das model over a stretching/shrinking sheet with suction and slip effects
    ( 2020-01-01)
    Yashkun, Ubaidullah
    ;
    Wan Mohd Khairy Adly Wan Zaimi
    ;
    Nor Ashikin Abu Bakar
    ;
    Ferdows M.
    In this paper, we considered the stagnation point flow and heat transfer of nanofluid over the stretching/shrinking surface by utilizing of Tiwari and Das nanofluid model. Additionally, the impact of suction and the first order slip likewise have been taken into the account. The system of governing partial differential equations (PDEs) is changed into the system of non-linear ordinary differential equations (ODEs) by means of similarity transformation. The resultant ODEs are solved by using BVP solver (bvp4c) in MATLAB software. The impact of some physical parameters, for example the suction parameter and the slip parameter on the skin friction coefficients and the local Nusselt number as well as the temperature and velocity profiles have been investigated, tabulated and graphically presented. These profiles and variations demonstrate that there exist dual solutions for a specific range of the stretching/shrinking parameter. Both suction and slip effects has enhance the local Nusselt number which represent heat transfer rate at the surface. It is also found that inclusion of both suction and slip effects expands the range of the dual solutions exist. The existence of the dual solutions only occurs in in the shrinking region. The flow separation in the boundary layer delay due to suction and slip effects imposed in the boundary condition.
  • Publication
    Statistical modeling for nanofluid flow: a stretching sheet with thermophysical property data
    (MDPI, 2020)
    Alias Jedi
    ;
    Azhari Shamsudeen
    ;
    Noorhelyna Razali
    ;
    Haliza Othman
    ;
    Nuryazmin Ahmat Zainuri
    ;
    Noraishikin Zulkarnain
    ;
    Nor Ashikin Abu Bakar
    ;
    Kafi Dano Pati
    ;
    Thanoon Y. Thanoon
    This paper reports the use of a numerical solution of nanofluid flow. The boundary layer flow over a stretching sheet in combination of two nanofluids models is studied. The partial differential equation that governs this model was transformed into a nonlinear ordinary differential equation by using similarity variables, and the numerical results were obtained by applying the shooting technique. Copper (Cu) nanoparticles (water-based fluid) were used in this study. This paper presents and discusses all numerical results, including those for the local Sherwood number and the local Nusselt number. Additionally, the effects of the nanoparticle volume fraction, Brownian motion Nb, and thermophoresis Nt on the performance of heat transfer are discussed. The results show that the stretching sheet has a unique solution: as the nanoparticle volume fraction φ (φ = 0), Nt (Nt = 0.1), and Nb decrease, the rate of heat transfer increases. Furthermore, as φ (φ = 0) and Nb decrease, the rate of mass transfer increases. The data of the Nusselt and Sherwood numbers were tested using different statistical distributions, and it is found that both datasets fit the Weibull distribution for different values of Nt and rotating φ.
  • Publication
    Dual solutions of boundary layer flow and heat transfer in hybrid nanofluid over a stretching/shrinking cylinder
    (Semarak Ilmu Publishing, 2023)
    Nor Ashikin Abu Bakar
    ;
    Rohana Abdul Hamid
    ;
    Najwa Najib
    The boundary layer flow over a stretching/shrinking cylinder in hybrid nanofluid with the effects of suction, partial slip and convective boundary condition is studied. Hybrid nanoparticles Al2O3 and TiO2 with water as based fluid are considered in the study. The partial differential equations are transformed to ordinary differential equations by employing the similarity variables. The numerical results are obtained using the bvp4c solver in MATLAB software. The influence of nanoparticles volume fraction (Al2O3-TiO2 in water-based fluid), curvature parameter, suction parameter, partial slip parameter and Biot number on the velocity profile, temperature profile, skin friction coefficient and heat transfer rate are discussed. The numerical results indicate that for shrinking surface case, the dual solutions exist for a certain range of curvature parameter and suction parameter.
  • Publication
    Slip effect on unsteady hybrid nanofluid flow over a stretching/shrinking surface
    (AIP Publishing, 2023)
    Najwa Najib
    ;
    Nor Ashikin Abu Bakar
    ;
    Nor Fadhilah Dzulkifli
    The focus on this paper is to investigate the effect of slip in hybrid nanofluid past a stretching/shrinking surface by depending on time. The partial differential equations of governing equations are transformed to ordinary differential equations by employing appropriate similarity transformation. The equations are then solved numerically using bvp4c function in MATLAB software. The results of skin frictions coefficient and heat transfer rate are depicted in tables and graphs. It poses dual solutions for a certain domain of each solution.
  • Publication
    Engineering students' performances in mathematics through project-based learning
    (Horizon Research Publishing, 2020)
    N. Razali
    ;
    N. A. Zainuri
    ;
    H. Othman
    ;
    Z. M. Nopiah
    ;
    Nor Ashikin Abu Bakar
    Project-based learning is an example of active learning and is student-driven, interdisciplinary, collaborative and technology-based. To test the hypothesis that project-based learning maximises course performance, we analysed a difficulty index of examination scores or failure rates and compared between 422 students in the 2016/2017 session, who took the Vector Calculus course and project-based learning with 342 students from the 2015/2016 session without project-based learning. The analysis of the difficulty index is used to investigate the achievement of the course outcome and the analysis on the correlation between the project-based learning scores and the final exam scores are identified using Pearson's product-moment correlation. The effect sizes indicate that on average examination scores improved by about 12% with project-based learning and students in classes with project-based learning were 3.4 times more likely to get as than students in classes without project-based learning. It is observed that the difficulty index for all course outcomes are achieved and distributed between a good range of 0.3–0.8. It is also proven that the students find it easier to answer the exam questions after the project-based learning is implemented based on the results of their mid and final semester exams.
      17  1
  • Publication
    Stability analysis on stagnation-point flow and heat transfer towards a permeable stretching/shrinking sheet with heat source in a casson fluid
    ( 2020-01-01)
    Yashkun U.
    ;
    Fatinnabila Kamal
    ;
    Wan Mohd Khairy Adly Wan Zaimi
    ;
    Nor Ashikin Abu Bakar
    ;
    Norshaza Atika Saidin
    This paper deals with a stagnation-point boundary layer flow and heat transfer of a Casson fluid towards a stretching/shrinking sheet. The main objective of the present study is to analyse the effects of the injection parameter and heat source on the velocity and temperature profiles as well as the skin friction coefficient and the Nusselt number. It is vital to study the heat transfer and fluid flow problems in the presence of injection and heat source effects due to a wide variety of applications in engineering and industry. The governing nonlinear partial differential equations are transformed into a system of nonlinear ordinary differential equations by using similarity transformation, before being solved numerically using the boundary value problem solver bvp4c routine in MATLAB. Dual solutions are found to exist for the shrinking sheet case, whereas the solution is unique for the stretching case. The stability analysis has been performed to determine the stable solution. It is shown that the first solutions are stable and physically reliable while the second solutions are not. Further, the present results have been compared with the previous published results for a particular case and the comparisons are found to be in good agreement. The local Nusselt number is decreases with an increase in heat source parameter. Rising values of the injection parameter has decreases both the skin friction coefficient and the local Nusselt number.
      5  16
  • Publication
    Unsteady stagnation-point flow and heat transfer over an exponential stretching/shrinking sheet in hybrid nanofluid exhibiting slip effect
    (AIP Publishing, 2024-08-19)
    Nor Fadhilah Dzulkifli
    ;
    Najwa Najib
    ;
    Nor Ashikin Abu Bakar
    This study focuses on the investigation of unsteady stagnation-point flow and heat transfer over an exponential stretching/shrinking sheet immersed in a hybrid nanofluid. Hybrid nanofluid is an engineered fluid and can enhance thermal conductivity and heat transfer efficiency and stagnation-point flow is important in designing heat exchangers. Hence, the heat exchange process such as in power generation, and refrigeration becomes more effective. This mathematical model applied the Tiwari and Das model where Al2O3 - Cu hybrid nanofluid is considered. The base fluid is water, and the shape of the nanoparticle is considered in sphere shape. The ordinary differential equations are solved using the bvp4c function in the Matlab program to obtain the skin friction coefficient, heat transfer rate as well as velocity and temperature profiles. This study provides some tables of the skin-fiction coefficients and heat transfer rate values for the validation with the previous study and new values for the future study. This study reveals that dual solutions exist for suction s > sc. The increase of copper nanoparticles expands the solution and increases the skin friction coefficient at the surface. Meanwhile, by considering the higher effect of the slip parameter, the findings show an increment in both skin friction coefficient and heat transfer rate at the surface. The heat transfer rate is seen increasing by considering the same value of nanoparticle Volume fraction for copper and alumina compared to the different values.