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  • 1
    Online Resource
    Online Resource
    RETRACTED: Influence of homogeneous/heterogeneous reactions on a radiative second-grade micropolar fluid flow over an exponentially stretching Riga plate with Joule heating
    SAGE Publications ; 2021
    In:  Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, SAGE Publications
    Type of Medium: Online Resource
    ISSN: 0954-4089 , 2041-3009
    URL: Article
    DOI: 10.1177/09544089211067676
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2024897-0
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  • 2
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    Online Resource
    Thermal slip and homogeneous/heterogeneous reaction characteristics of second-grade fluid flow over an exponentially stretching sheet
    SAGE Publications ; 2021
    In:  Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, SAGE Publications
    Abstract: This paper deals with an unsteady magnetohydrodynamic two-dimensional second-grade fluid flow towards a permeable exponentially stretching surface with heterogeneous–homogeneous reactions. The nonuniform heat source/sink, thermal slip, and thermal radiation effect are also considered to analyze the thermal attributes. The modeled equations of motions are converted into nonlinear ordinary differential equations (ODEs) by suitable transformations. A MATLAB Bvp4c approach is employed for the numerical solution of ODEs. The outcomes of various parameters are scrutinized by graphs. The quantities of interests such as Nusselt number and the skin friction are presented and discussed. The resistance effects take place due to higher estimations of second-grade parameter, as a result, the velocity field declines. The temperature field raises with the increment of radiation parameter. The concentration of nanoparticles decaying when heterogeneous-homogeneous reactions become larger. Moreover, from the tabulated data, it is noticed the growing estimations of K and M boosts the coefficient of skin friction.
    Type of Medium: Online Resource
    ISSN: 0954-4089 , 2041-3009
    URL: Article
    DOI: 10.1177/09544089211064187
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2024897-0
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  • 3
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    Online Resource
    Active and passive control of nanoparticles in squeezing flow under the influence of magnetic field of variable intensity
    SAGE Publications ; 2022
    In:  Advances in Mechanical Engineering Vol. 14, No. 1 ( 2022-01), p. 168781402210752-
    Details
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 14, No. 1 ( 2022-01), p. 168781402210752-
    Abstract: According to researchers, the nano-particles utilized in nano-fluids are typically comprised of metals, oxides, carbides, or carbon nanotubes. Nano-fluids have a wide range of applications including heat transfer, soil remediation, lubrication, oil recovery, and detergency. The current study focuses on the investigation of the active and passive control of nanoparticles between the squeezing plates in the presence of a magnetic field. The traditional Navier-Stokes nano-fluid equation along with the Maxwell equation, the magnetic force term, the energy equation, and the volume fraction equation are converted into the ordinary differential equations for establishing natural parameters. The Coupled systems of non-linear ODEs are then solved numerically through parametric continuation method. The Nusselt number, entropy generation, and nanoparticles volume fractions profiles are shown graphically to see the effect of several parameter under consideration. For accuracy, the results obtained by PCM has been compared with the result by BVP4C. It has been observed that the increase in the squeezing parameter decreases the fluid temperature. The active control of nano-particles decreases the mass transfer while passive control increases the mass transfer. Also, the active and passive of nanoparticles increases the temperature gradient with the increase of thermophoresis parameter. The same but opposite behavior is also observed for mass transfer. The increase in [Formula: see text], [Formula: see text] , and [Formula: see text] for active and passive of nanoparticles and boundary layer thickness decreases the entropy generation.
    Type of Medium: Online Resource
    ISSN: 1687-8132 , 1687-8140
    URL: Article
    DOI: 10.1177/16878140221075200
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2501620-9
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  • 4
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    Online Resource
    An Empirical Analysis of the Influence of Project Governance and Information Technology Governance on Project Delay
    SAGE Publications ; 2022
    In:  Global Business Review
    Details
    In: Global Business Review, SAGE Publications
    Abstract: Project delay adversely affects the cost overrun, poor quality and stakeholder’s disputes thus resulting in unsuccessful projects. Project delay has a number of antecedents including the governance of project and information technology. The study provides empirical analysis of determinants of schedule delays in project completion. This will test the hypothesis that assumes that project governance and information technology governance are major predictor of project schedule delays. The study considers the software industry located in twin cities of Islamabad and Rawalpindi, Pakistan. According to the Pakistan Security and Exchange Commission, there are 245 software houses registered in Islamabad while 80 are registered in Rawalpindi. The study has used survey questionnaires to gather required information. Data was collected through simple random sampling techniques from 220 respondents. The data collected was analysed by doing structural equation modelling (SEM) to examine the said relationships. The reliability and validity of the instrument is established by the Cronbach’s α, composite reliability, and average variance extracted having values above threshold of 0.7, 0.7, and 0.5, respectively. The regression weight for first hypothesis (H1) assuming negative relationship between ITG and PD is −0.292. The second hypothesis (H2) assuming negative relationship between PG and PD has regression value of −0.418. The values of both hypotheses are significant. The study empirically tests the relationship between ITG, PG, and PD. The results suggest that better project governance (PG) reduces project delay (PD) and vice versa. Similarly, an appropriate information technology governance (ITG) also reduces the project delay (PD).
    Type of Medium: Online Resource
    ISSN: 0972-1509 , 0973-0664
    URL: Article
    DOI: 10.1177/09721509221121179
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2211884-6
    SSG: 3,2
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  • 5
    Online Resource
    Online Resource
    Numerical and experimental investigation of Johnson–Cook material models for aluminum (Al 6061-T6) alloy using orthogonal machining approach
    SAGE Publications ; 2018
    In:  Advances in Mechanical Engineering Vol. 10, No. 9 ( 2018-09), p. 168781401879779-
    Details
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 10, No. 9 ( 2018-09), p. 168781401879779-
    Abstract: This research focuses on the study of the effects of processing conditions on the Johnson–Cook material model parameters for orthogonal machining of aluminum (Al 6061-T6) alloy. Two sets of parameters of Johnson–Cook material model describing material behavior of Al 6061-T6 were investigated by comparing cutting forces and chip morphology. A two-dimensional finite element model was developed and validated with the experimental results published literature. Cutting tests were conducted at low-, medium-, and high-speed cutting speeds. Chip formation and cutting forces were compared with the numerical model. A novel technique of cutting force measurement using power meter was also validated. It was found that the cutting forces decrease at higher cutting speeds as compared to the low and medium cutting speeds. The poor prediction of cutting forces by Johnson–Cook model at higher cutting speeds and feed rates showed the existence of a material behavior that does not exist at lower or medium cutting speeds. Two factors were considered responsible for the change in cutting forces at higher cutting speeds: change in coefficient of friction and thermal softening. The results obtained through numerical investigations after incorporated changes in coefficient of friction showed a good agreement with the experimental results.
    Type of Medium: Online Resource
    ISSN: 1687-8140 , 1687-8140
    URL: Article
    DOI: 10.1177/1687814018797794
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2501620-9
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  • 6
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    Online Resource
    Parametric analysis of the heat transfer behavior of the nano-particle ionic-liquid flow between concentric cylinders
    SAGE Publications ; 2021
    In:  Advances in Mechanical Engineering Vol. 13, No. 6 ( 2021-06), p. 168781402110240-
    Details
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 13, No. 6 ( 2021-06), p. 168781402110240-
    Abstract: This paper investigates the enhanced viscous behavior and heat transfer phenomenon of an unsteady two di-mensional, incompressible ionic-nano-liquid squeezing flow between two infinite parallel concentric cylinders. To analyze heat transfer ability, three different type nanoparticles such as Copper, Aluminum [Formula: see text], and Titanium oxide [Formula: see text] of volume fraction ranging from 0.1 to 0.7 nm, are added to the ionic liquid in turns. The Brinkman model of viscosity and Maxwell-Garnets model of thermal conductivity for nano particles are adopted. Further, Heat source [Formula: see text], is applied between the concentric cylinders. The physical phenomenon is transformed into a system of partial differential equations by modified Navier-Stokes equation, Poisson equation, Nernst-Plank equation, and energy equation. The system of nonlinear partial differential equations, is converted to a system of coupled ordinary differential equations by opting suitable transformations. Solution of the system of coupled ordinary differential equations is carried out by parametric continuation (PC) and BVP4c matlab based numerical methods. Effects of squeeze number ( S), volume fraction [Formula: see text] , Prandtle number (Pr), Schmidt number [Formula: see text], and heat source [Formula: see text] on nano-ionicliquid flow, ions concentration distribution, heat transfer rate and other physical quantities of interest are tabulated, graphed, and discussed. It is found that [Formula: see text] and Cu as nanosolid, show almost the same enhancement in heat transfer rate for Pr = 0.2, 0.4, 0.6.
    Type of Medium: Online Resource
    ISSN: 1687-8140 , 1687-8140
    URL: Article
    DOI: 10.1177/16878140211024009
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2501620-9
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