Graduate on Time: Factors of Failure in UiTM Cawangan Johor

The percentage of diploma students who graduate on time in UiTM Cawangan Johor for each semester was inadequate. Therefore, this study seeks to explore the factors that influence students to be unsuccessfully graduating on time. A sample of 17 extended full-time modes (SML) students in the semester of July – August 2018 (intersession semester) had been utilised as the primary data. In this research, the descriptive analytics study was also used. The students were asked an open-ended question to get the required information based on the objective of the study. In 30 minutes, 97 answers were received and recorded. Based on the answers obtained by the students, there are 10 categories that can be identified according to the similarities of answers given by the students. The 10 categories are then called the factors. It includes (1) learning abilities, (2) attitude towards learning, (3) time management, (4) system, (5) lecturer, (6) strategy, (7) low self-confidence, (8) peer, (9) lack of family support and (10) financial difficulties. This study is important because it attempts to generate research-based recommendations in order to improve the percentage of students who graduate on time in UiTM Cawangan Johor. The findings of the study may suggest new methods of activities or programmes that are needed to be taken into consideration by the university in the future. The increase in GOT students will only materialise if the actions have been taken, which is depending on the findings of this study

Flow and heat transfer of Williamson hybrid ferrofluid with combined convective transport

The present research investigated the characteristics of combined convective blood flow carrying copper and magnetite nanoparticles over a shrinking sheet, modelled as Williamson hybrid ferrofluid. The mathematical model is converted to similarity equations by suitable transformations. The similarity equations are then solved using the bvp4c function. The characteristics and effects of Williamson and combined convective transport parameter, as well as the nanoparticle volume fraction in the Williamson hybrid ferrofluid towards the temperature profiles, velocity profiles as well as the Nusselt number and the skin friction coefficient are analyzed and discussed. Outcomes reveal the increment in Williamson parameter suppress the heat transfer performance of the fluid but not for the combined convective transport parameter. Meanwhile the heat transfer performance is also improved as concentration of copper is increased

The mixed of hybrid nanofluid GO-MoS2/engine oil over a shrinking sheet with mass flux effect: Reiner-Philippoff model

The mixed convection flow and heat transfer of the hybrid nanofluid over a shrinking sheet are investigated. Molybdenum disulphide (MoS2) and graphene oxide (GO) are employed as two hybrid nanoparticles while engine oil (EO) as the base fluid is considered. In this study, the Reiner-Philippoff model as one of non-Newtonian types is deliberated since it has the ability to function on three distinct types of fluids: viscous, shear thickening and shear thinning. The Reiner-Philippoff relation, the momentum and energy equations under Tiwari and Das model are all employed in the study. Influences from mass flux are also considered in the flow. Before computation using the bvp4c function in MATLAB, the respected equations are first converted into ordinary differential equation form using the similarity transformation. When the established and current models are discovered to be identical in a specific case, a direct comparative investigation is conducted to confirm the correctness of the current model. In addition, the present results are shown graphically and in tabular form. It is hypothesized that the presence of a hybrid nanofluid significantly affects the fluid characteristic and gives more satisfactory results than a single nanofluid. The skin friction coefficient and heat transfer rate of hybrid nanofluids are greater than the nanofluids. In terms of velocity and temperature profile, the reduction in velocity and the enhancement in temperature profile are caused by a rise in the Reiner-Philippoff parameter. The same outcome is also seen when the volume fraction of hybrid nanofluids increases

Thermophysical correlation of hybrid nanofluids (HNFs): A thematic review

Hybrid nanofluidsrepresentinnovative fluid class that combine the advantages of nanoparticles with base fluid to enhance the heat transfer capabilities. It exhibits higherheat transfer capabilities compared to traditional nanofluids. Researchers have seized abundant opportunity to further investigate the unknown behaviour of hybrid nanofluidsover different geometries and physical parameters numerically by implementing a certain model of correlation. However, fromthe literature, these correlation models sometimes underestimate the experimental data of thermal performance. Thus, it is crucial for this review paper to discuss these modelsfor advancing research in this field. Utilizing keyword search and filtering parameters, 354 journal articles from the Scopus and Web of Science (WoS) databases were found.Following the application of the inclusion and exclusion criteria process, only 60 papers were evaluated as final articles. These studies were further classifiedinto seventypes ofcorrelations: Devi, Modified Devi Type A, Modified Devi Type B, Modified Devi Type C, Takabi, Modified Takabiand Xue model.It is found that Xue model is widely used for solving hybrid nanofluidsflow problem which dealing with carbon nanotube particle. While Devi and Takabi-based model are extensively used for non-carbon nanotube particle. Thisstudy provides valuable insightsfor future research to further study the hybrid nanofluid flow precisely and increase the heat transfer performance

Combined convective transport of Williamson hybrid nanofluid over a shrinking sheet

In this study, the combined convective transport of Williamson hybrid nanofluid flow over a shrinking sheet containing Alumina (Al2O3) and Copper (Cu) nanoparticles with Engine Oil (EO) as its base fluid is investigated. The mathematical model is converted to similarity equations by suitable transformations. The bvp4c function in MATLAB is utilized to solve the similarity equations numerically. The comparison of the present model with the established model for verification purposes shows a reasonable agreement. The influences of several fluid parameters on the fluid flow behaviour are analysed. Outcomes reveal the increment in combined convective transport and suction parameter improve the performance of heat transport of the fluid. Furthermore, the non-Newtonian Williamson hybrid nanofluid provided better heat transport performance compared to nanofluid with the same value of nanoparticle concentration

Combined convective transport of Williamson hybrid nanofluid over a shrinking sheet

In this study, the combined convective transport of Williamson hybrid nanofluid flow over a shrinking sheet containing Alumina (Al2O3) and Copper (Cu) nanoparticles with Engine Oil (EO) as its base fluid is investigated. The mathematical model is converted to similarity equations by suitable transformations. The bvp4c function in MATLAB is utilized to solve the similarity equations numerically. The comparison of the present model with the established model for verification purposes shows a reasonable agreement. The influences of several fluid parameters on the fluid flow behaviour are analysed. Outcomes reveal the increment in combined convective transport and suction parameter improve the performance of heat transport of the fluid. Furthermore, the non-Newtonian Williamson hybrid nanofluid provided better heat transport performance compared to nanofluid with the same value of nanoparticle concentration

Free convection boundary layer flow of Brinkman-viscoelastic fluid over a horizontal circular cylinder with constant wall temperature

The demand on the complex model on the study of fluid flow problem is crucial since the real fluid exist in industry applications cannot be presented by the conventional fluid anymore due to the complex properties of the materials. Since then, many mathematicians and scientist try to create the model that can be presented those fluids. Fluid which having characteristics viscous and elasticity can be categorized as non-Newtonian type of fluid due to its relations which against Newton’s Law of viscosity. The application of the fluid is widespread in industrial applications including oils and gas sectors, the automobile industry and manufacturing processes. Paints is one of the examples of viscoelastic fluid since almost wall is painted by the materials polymer and solvents. Therefore, this work is intended to investigate the viscoelastic fluid flow with the porosity condition which then called as Brinkman-viscoelastic model. The flow is presumed to transfer over a geometry horizontal circular cylinder (HCC). The thermal boundary condition is set to be constant wall temperature (CWT). The governing equations which based on Navier Stokes equations are first transformed to the less complex form by utilizing a non-dimensionless and a non-similarity variable. The resulting equations were obtained in the partial differential equations (PDEs) and at the lower stagnation point case, the model is reduced to the ordinary differential equations (ODEs). The Keller-box method (KBM) is applied to solved the final equations. The validation process is performed by direct comparing with the established output in literature and found to be in a very strong agreement. This process is valid since the present model can be reduced to the previous model at the limiting case where the identical equations were obtained. The results of the present model are then computed and presented in tabular form and also illustrated in graphical form. It is noticed that the viscoelastic parameter and Brinkman Parameter significantly affected the fluid flow characteristics

Exploration of recent developments of hybrid nanofluids

Over the past two decades, research on hybrid nanofluids has developed at a breakneck pace. Hybrid nanofluids are the potential fluids that outperform conventional nanofluids heat transfer fluids regarding thermophysical characteristics and thermal performance. Hybrid nanofluids are traditionally prepared by emulsifying each nanoparticle into the base fluid independently or diffusing both particles as a composite form into the base fluid. Despite the popularity and broad application of hybrid nanofluids in industrial/manufacturing processes, the review article classifying the mathematical models and categorization of the various hybrid nanofluids is limited in the scientific community. In light of this, this study examines recent and past research articles on deterministic hybrid nanofluid flow problems by exploiting different categorizations and metrics (method to solve the differential equation, the geometry of choice and thermophysical effects that have been employed as well as the nano-particle types). Researchers will be able to use the findings of this study for a future research proposal. Essentially, it is to fill in the gaps in the literature, particularly regarding the mathematical model for hybrid nanofluid flow problems and determining the geometry, thermophysical properties, and nanoparticle type

Mathematical model of Reiner-Philippoff embedded with Al2O3 and Cu particles over a shrinking sheet with mixed convection and mass flux effect

The investigation on the Reiner–Philippoff fluid model embedded with two different nanoparticles (Al2O3 and Cu) over a shrinking sheet is carried out. The Tiwari and Das model are applied in the study covering the continuity, momentum, energy equations, and Reiner-Philippoff relation. The flow studied also considers the mixed convection and mass flux influences. The respective equations are first transformed into ordinary differential equation form using the similarity transformation before performing the computation work using the bvp4c function in MATLAB. The present model is identical to the established model in special cases, and then a direct comparative study is executed to verify the current model. The results for respective problems are presented in tabular and graphical form. It is perceived that the presence of nanoparticles affects the fluid characteristic significantly

Mathematical model of Reiner-Philippoff embedded with Al2O3 and Cu particles over a shrinking sheet with mixed convection and mass flux effect

The investigation on the Reiner–Philippoff fluid model embedded with two different nanoparticles (Al2O3 and Cu) over a shrinking sheet is carried out. The Tiwari and Das model are applied in the study covering the continuity, momentum, energy equations, and Reiner-Philippoff relation. The flow studied also considers the mixed convection and mass flux influences. The respective equations are first transformed into ordinary differential equation form using the similarity transformation before performing the computation work using the bvp4c function in MATLAB. The present model is identical to the established model in special cases, and then a direct comparative study is executed to verify the current model. The results for respective problems are presented in tabular and graphical form. It is perceived that the presence of nanoparticles affects the fluid characteristic significantly