Search results
1 – 10 of 980Mehboob Ali, F. Sultan, Waqar Azeem Khan, M. Shahzad, Hina Arif and M. Irfan
The purpose of this paper is to investigate the heat transportation rate by using Cattaneo–Christov heat flux model. Furthermore, homogeneous-heterogeneous reaction is also…
Abstract
Purpose
The purpose of this paper is to investigate the heat transportation rate by using Cattaneo–Christov heat flux model. Furthermore, homogeneous-heterogeneous reaction is also deliberated in the modeling of concentration expression.
Design/methodology/approach
The nonlinear PDEs are reduced to ODEs via implementation of applicable transformations. Numerical scheme bvp4c is used to obtain convergent solutions.
Findings
The main findings are to characterize the generalized Fourier’s heat flux and homogeneous-heterogeneous reactions in 3D flow of non-Newtonian cross fluid.
Originality/value
It is to certify that this paper is neither published earlier nor submitted elsewhere.
Details
Keywords
Waqar Azeem Khan, Mehboob Ali, Muhammad Waqas, M. Shahzad, F. Sultan and M. Irfan
This paper aims to address the flow of Sisko nanofluid by an unsteady curved surface. Non-uniform heat source/sink is considered for heat transfer analysis.
Abstract
Purpose
This paper aims to address the flow of Sisko nanofluid by an unsteady curved surface. Non-uniform heat source/sink is considered for heat transfer analysis.
Design/methodology/approach
Numerical solutions are constructed using bvp4c procedure.
Findings
Pressure profile inside boundary region is increased when A and K are enhanced.
Originality/value
No such analysis is yet presented.
Details
Keywords
Waqar Azeem Khan, Muhammad Waqas, Mehboob Ali, F. Sultan, M. Shahzad and M. Irfan
This paper aims to develop a mathematical model featuring Brownian motion and thermophoresis. The idea of curved stretching subjected to time-dependent non-Newtonian (Sisko) fluid…
Abstract
Purpose
This paper aims to develop a mathematical model featuring Brownian motion and thermophoresis. The idea of curved stretching subjected to time-dependent non-Newtonian (Sisko) fluid flow is introduced.
Design/methodology/approach
Shooting scheme is implemented to compute nonlinear systems.
Findings
Velocity profile of Sisko magnetonanofluid enhances for augmented values of curvature parameter.
Originality/value
To the best of the authors’ knowledge, no such analysis has yet been reported.
Details
Keywords
Chau Ngoc Dang, Warit Wipulanusat, Peem Nuaklong and Boonsap Witchayangkoon
In developing countries, construction organizations are seeking to effectively implement green innovation strategies. Thus, this study aims to assess the importance of green…
Abstract
Purpose
In developing countries, construction organizations are seeking to effectively implement green innovation strategies. Thus, this study aims to assess the importance of green innovation practices and develop a measurement model for quantifying the green innovation degrees of construction firms.
Design/methodology/approach
A mixed-methods research approach is adopted. First, an extensive literature review is performed to identify potential green innovation items, which are then used to design a preliminary questionnaire. Next, expert interviews are conducted to pilot-test this questionnaire. Subsequently, by using a convenience non-probability sampling method, 88 valid responses are collected from construction firms in Vietnam. Then, one-sample and independent-samples t tests are employed to assess the importance of green innovation practices. Fuzzy synthetic evaluation (FSE) is also applied to quantitatively compare such practices. Finally, green innovation level (GIL) is proposed to measure the green innovation indexes and validated by a case study of seven construction firms.
Findings
This study identifies 13 green innovation variables, of which several key practices are highlighted for small/medium and large construction firms. The results of FSE analysis indicate that green process innovation is the most vital green category in construction firms, followed by green product and management innovations, respectively. As a quantitative measure, GIL could allow construction firms to frequently evaluate their green innovation indexes, thereby promoting green innovation practices comprehensively. Hence, construction firms would significantly enhance green competitive advantages and increasingly contribute to green and sustainable construction developments.
Originality/value
This research is one of the first attempts to integrate various green innovation practices into a comprehensive formulation. The established indexes offer detailed green innovation evaluations, which could be considered as valuable references for construction practitioners. Furthermore, a reliable and practical tool (i.e. GIL) is proposed to measure the GILs of construction firms in developing countries.
Details
Keywords
William J. Ritchie, George Young, Ali M. Shahzad, Robert W. Kolodinsky and Steven A. Melnyk
The purpose of this paper is to explore product adoption beliefs and actions of a large retail food organization with both corporate-owned stores and privately held franchise…
Abstract
Purpose
The purpose of this paper is to explore product adoption beliefs and actions of a large retail food organization with both corporate-owned stores and privately held franchise stores.
Design/methodology/approach
The authors used a case study approach involving survey data collection from 190 corporate-owned and licensed retail outlets that were members of a large, single organization. Ordinary least squares regression and mean differences (t-tests) were used to test the data. Findings were elaborated upon based upon structured interviews.
Findings
Corporate-owned retail outlets invested heavily in food safety innovation, while franchised retail outlets pursued minimal investment to retain product flexibility. The level of adoption is contingent upon ownership structure, as well as institutional forces emanating from the corporate environment, the customer, and peer organizations.
Research limitations/implications
The findings offer greater insight into methodological issues associated with measurement of new product adoption in particular. The authors have shown that it is critical for researchers to clarify the level of analysis of the study. Quantitative survey analysis revealed both safety and economic motivations to be desirable issues in product adoption considerations. However, when quantitative and qualitative results were combined, very different outcomes were realized as ownership structure differences appear to dominate product adoption decisions. Therefore, when conducting plural organizational form research, the data gathering efforts must be carefully undertaken to ensure that critical drivers of phenomena explored are not overlooked.
Practical implications
Adoption of new product adoption involves the complex interplay between ownership structure/control, economic cost/benefit, managerial choice, and societal norms. Often, organizational research relating to adoption of new processes and innovations collects individual-level data. However, this study shows that adoption decisions occur at multiple levels and that the ownership/structural context must be considered.
Social implications
The study has implications from social innovation/responsibility perspectives. Recent press regarding food safety has put pressure on food processing establishments to consider methods of reducing food safety breaches. No doubt, this has alerted the consumer to potential risks in food processing and influenced their preferences in favor of food safety innovations. Nonetheless, perceptions of the importance of “safety” can be interpreted in a variety of ways, leading to differing courses of action. Interviews with corporate-level executives revealed that they preferred both corporate-owned and franchised retail outlets adopt case ready (CR) meats to stem safety concerns. Yet, this aspiration diffused throughout the organization differently.
Originality/value
Multiple organizational structure forms operating within the same organizational entity, or “plural form” organizations, offer unique opportunities for examination. Applying various theoretical lenses, including agency theory, the resource-based theory, and institutional theory, the authors offer rationale for why different structural types within the same corporate entity may differ in their beliefs and actions concerning product safety, cost, and adoption.
Details
Keywords
Seyyed Masoud Seyyedi, A.S. Dogonchi, M. Hashemi-Tilehnoee, D.D. Ganji and Ali J. Chamkha
Natural convection heat transfer analysis can be completed using entropy generation analysis. This study aims to accomplish both the natural convection heat transfer and entropy…
Abstract
Purpose
Natural convection heat transfer analysis can be completed using entropy generation analysis. This study aims to accomplish both the natural convection heat transfer and entropy generation analyses for a hexagonal cavity loaded with Cu-H2O nanoliquid subjected to an oriented magnetic field.
Design/methodology/approach
Control volume-based finite element method is applied to solve the non-dimensional forms of governing equations and then, the entropy generation number is computed.
Findings
The results portray that both the average Nusselt and entropy generation numbers boost with increasing aspect ratio for each value of the undulation number, while both of them decrease with increasing the undulation number for each amplitude parameter. There is a maximum value for the entropy generation number at a specified value of Hartmann number. Also, there is a minimum value for the entropy generation number at a specified value of angle of the magnetic field. When the volume fraction of nanoparticles grows, the average Nusselt number increases and the entropy generation number declines. The entropy generation number attains to a maximum value at Ha = 14 for each value of aspect ratio. The average Nusselt number ascends 2.9 per cent and entropy generation number decreases 1.3 per cent for Ha = 0 when ϕ increases from 0 to 4 per cent.
Originality/value
A hexagonal enclosure (complex geometry), which has many industrial applications, is chosen in this study. Not only the characteristics of heat transfer are investigated but also entropy generation analysis is performed in this study. The ecological coefficient of performance for enclosures is calculated, too.
Details
Keywords
Pascalin Tiam Kapen, Cédric Gervais Njingang Ketchate, Didier Fokwa and Ghislain Tchuen
For this purpose, a linear stability analysis based on the Navier–Stokes and Maxwell equations is made leading to an eigenvalue differential equation of the modified…
Abstract
Purpose
For this purpose, a linear stability analysis based on the Navier–Stokes and Maxwell equations is made leading to an eigenvalue differential equation of the modified Orr–Sommerfeld type which is solved numerically by the spectral collocation method based on Chebyshev polynomials. Unlike previous studies, blood is considered as a non-Newtonian fluid. The effects of various parameters such as volume fraction of nanoparticles, Casson parameter, Darcy number, Hartmann number on flow stability were examined and presented. This paper aims to investigate a linear stability analysis of non-Newtonian blood flow with magnetic nanoparticles with an application to controlled drug delivery.
Design/methodology/approach
Targeted delivery of therapeutic agents such as stem cells and drugs using magnetic nanoparticles with the help of external magnetic fields is an emerging treatment modality for many diseases. To this end, controlling the movement of nanoparticles in the human body is of great importance. This study investigates controlled drug delivery by using magnetic nanoparticles in a porous artery under the influence of a magnetic field.
Findings
It was found the following: the Casson parameter affects the stability of the flow by amplifying the amplitude of the disturbance which reflects its destabilizing effect. It emerges from this study that the taking into account of the non-Newtonian character is essential in the modeling of such a system, and that the results can be very different from those obtained by supposing that the blood is a Newtonian fluid. The presence of iron oxide nanoparticles in the blood increases the inertia of the fluid, which dampens the disturbances. The Strouhal number has a stabilizing effect on the flow which makes it possible to say that the oscillating circulation mechanisms dampen the disturbances. The Darcy number affects the stability of the flow and has a stabilizing effect, which makes it possible to increase the contact surface between the nanoparticles and the fluid allowing very high heat transfer rates to be obtained. It also emerges from this study that the presence of the porosity prevents the sedimentation of the nanoparticles. By studying the effect of the magnetic field on the stability of the flow, it is observed that the Hartmann number keeps the flow completely stable. This allows saying that the magnetic field makes the dissipations very important because the kinetic energy of the electrically conductive ferrofluid is absorbed by the Lorentz force.
Originality/value
The originality of this paper resides on the application of the linear stability analysis for controlled drug delivery.
Details
Keywords
Basharat Ullah, Faisal Khan, Bakhtiar Khan and Muhammad Yousuf
The purpose of this paper is to analyze electromagnetic performance and develop an analytical approach to find the suitable coil combination and no-load flux linkage of the…
Abstract
Purpose
The purpose of this paper is to analyze electromagnetic performance and develop an analytical approach to find the suitable coil combination and no-load flux linkage of the proposed hybrid excited consequent pole flux switching machine (HECPFSM) while minimizing the drive storage and computational time which is the main problem in finite element analysis (FEA) tools.
Design/methodology/approach
First, a new HECPFSM based on conventional consequent pole flux switching permanent machine (FSPM) is proposed, and lumped parameter magnetic network model (LPMNM) is developed for the initial analysis like coil combination and no-load flux linkage. In LPMNM, all the parts of one-third machine are modeled which helps in reduction of drive storage, computational complexity and computational time without affecting the accuracy. Second, self and mutual inductance are calculated in the stator, and dq-axis inductance is calculated using park transformation in the rotor of the proposed machine. Furthermore, on-load performance analysis, like average torque, torque density and efficiency, is done by FEA.
Findings
The developed LPMNM is validated by FEA via JMAG v. 19.1. The results obtained show good agreement with an accuracy of 96.89%.
Practical implications
The proposed HECPFSM is developed for high-speed brushless AC applications like electric vehicle (EV)/hybrid electric vehicle (HEV).
Originality/value
The proposed HECPFSM offers better flux regulation capability with enhanced electromagnetic performance as compared to conventional consequent pole FSPM. Moreover, the developed LPMNM reduces drive storage and computational time by modeling one-third of the machine.
Details
Keywords
Pascalin Tiam Kapen, Cédric Gervais Njingang Ketchate, DIdier Fokwa and Ghislain Tchuen
This paper aims to investigate a linear and temporal stability analysis of hybrid nanofluid flow between two parallel plates filled with a porous medium and whose lower plate is…
Abstract
Purpose
This paper aims to investigate a linear and temporal stability analysis of hybrid nanofluid flow between two parallel plates filled with a porous medium and whose lower plate is fixed and the upper plate animated by a uniform rectilinear motion.
Design/methodology/approach
The nanofluid is composed of water as a regular fluid, silver (Ag) and alumina (Al2O3) as nanoparticles. The mathematical model takes into account other effects such as the magnetic field and the aspiration (injection/suction). Under the assumption of a low magnetic Reynolds number, a modified Orr–Sommerfeld-type eigenvalue differential equation governing flow stability was derived and solved numerically by Chebyshev’s spectral collocation method. The effects of parameters such as volume fraction, Darcy number, injection/suction Reynolds number, Hartmann number were analyzed.
Findings
It was found the following: the Darcy number affects the stability of the flow, the injection/suction Reynolds number has a negligible effect, the volume fraction damped disturbances and the magnetic field plays a very important role in enlarging the area of flow stability.
Originality/value
The originality of this work resides in the linear and temporal stability analysis of hydromagnetic Couette flow for hybrid nanofluid through porous media with small suction and injection effects.
Details
Keywords
Khuram Shahzad, Tahir Ali, Marko Kohtamäki and Josu Takala
This study aims to present an integrated framework and investigate the enabling roles of governance mechanisms (i.e. contract, interdependence, trust and communication) in the…
Abstract
Purpose
This study aims to present an integrated framework and investigate the enabling roles of governance mechanisms (i.e. contract, interdependence, trust and communication) in the choice of effective conflict resolution strategies (CRS) that in turn facilitate buyer–supplier relationship (BSR) performance.
Design/methodology/approach
Using Web-survey, data are collected from 170 Finnish small- and medium-sized enterprises that have key relationships with suppliers. This study uses structural equation modeling to test the research framework and hypotheses of the study.
Findings
The results based on empirical evidence demonstrate how the firms’ choice of CRS depends on the governance mechanisms. The problem solving approach is the most preferable choice, while the legalistic approach remains the last resort influenced by different governance mechanisms. Interdependence and trust between firms drive them to compromise while resolving inter-organizational conflicts. The selected strategies by firms may also either reinforce or deteriorate relationship performance.
Practical implications
Supply chain managers should recognize the context in which these choices of CRS are made, as it guides them to anticipate their partner’s behavior as well as influences their strategy choice decisions when coping with conflicts. A trustworthy environment supports in providing a certain level of confidence while interdependency drives firms to compromise. The legalistic strategy can hurt the partner’s feelings and diminish relationship performance.
Originality/value
Conflicts in BSR have become inevitable, but the existing literature is missing evidence on how companies use CRS to enhance relationship performance. Hence, this study differs from those of earlier conflict studies, as it provides a more integrative perspective of buyer–supplier conflict resolution process. This study argues that relationship governance mechanisms can be connected to the choice of effective CRS when tensions arise. Moreover, by assessing the relationship between CRS and relationship performance, this study offers valuable insights to understand that effective strategies enable partners to mutually adapt constructive approaches that facilitate cooperative behavior and accommodate both parties’ interests and needs.
Details