Syed Tauseef Mohyud-Din, Muhammad Usman, Kamran Afaq, Muhammad Hamid and Wei Wang
The purpose of this study is to analyze the effects of carbon nanotubes (CNTs) in the Marangoni convection boundary layer viscous fluid flow. The analysis and formulation for both…
Abstract
Purpose
The purpose of this study is to analyze the effects of carbon nanotubes (CNTs) in the Marangoni convection boundary layer viscous fluid flow. The analysis and formulation for both types of CNTs, namely, single-walled (SWCNTs) and multi-walled (MWCNTs), are described. The influence of thermal radiation effect assumed in the form of energy expression.
Design/methodology/approach
Appropriate transformations reduced the partial differential systems to a set of nonlinear ordinary differential equations (ODEs). The obtained nonlinear ODE set is solved via the least squares method. A detailed comparison between outcomes obtained by the least squares method, RK-4 and already published work is available.
Findings
Nusselt number was analyzed and found to be more effective for nanoparticle volume fraction and larger radiation parameters. Additionally, the error and convergence analysis for the least squares method was presented to show the efficiency of the said algorithm.
Originality/value
The results reveal that velocity is a decreasing function of suction for both CNTs. While enhancing the nanoparticle volume fraction, an increase for both thermal boundary layer thickness and temperature was attained. The radiation parameter has an increasing function as temperature. Velocity behavior is the same for nanoparticle volume fraction and suction. It was observed that velocity is less in SWCNTs as compared to MWCNTs.
Details
Keywords
Shima Yazdani, Erfan Salimipour, Ayoob Salimipour, Mikhail A. Sheremet and Mohammad Ghalambaz
Active flow control on the NACA 0024 airfoil defined as suction-injection jet at the chord-based Reynolds number of 1.5 × 1e + 5 is studied.
Abstract
Purpose
Active flow control on the NACA 0024 airfoil defined as suction-injection jet at the chord-based Reynolds number of 1.5 × 1e + 5 is studied.
Design/methodology/approach
The three-dimensional incompressible unsteady Reynolds-averaged Navier–Stokes equations with the SST k-ω turbulence model are used to study the effects of coflow-jet (CFJ) on the dynamic and static stall phenomena. CFJ implementation is conducted with several momentum coefficients to investigate their turnover. Furthermore, the current work intends to analyze the CFJ performance by varying the Reynolds number and jet momentum coefficient and comparing all states to the baseline airfoil, which has not been studied in prior research investigations.
Findings
It is observed that at the momentum coefficient (Cµ) of 0.06, the lift coefficients at low attack angles (up to a = 15) dramatically increase. Furthermore, the dynamic stall at the given Reynolds number and with the lowered frequency of 0.15 is explored. In the instance of Cµ = 0.07, the lift coefficient curve does not show a noticeable stall feature compared to Cµ = 0.05, suggesting that a more powerful stronger jet can entirely control the dynamic stall.
Originality/value
Furthermore, the current work intends to analyze the CFJ performance by varying the jet momentum coefficient and comparing all states to the baseline airfoil, which has not been studied in prior research investigations.
Details
Keywords
Mahesh S. Shinde, Kishor Mahadeorao Ashtankar, Abhaykumar M. Kuthe, Sandeep W. Dahake and Mahesh B. Mawale
This review paper aims to provide an overview of applications of direct rapid manufacturing assisted mold with conformal cooling channels (CCCs) and shows the potential of this…
Abstract
Purpose
This review paper aims to provide an overview of applications of direct rapid manufacturing assisted mold with conformal cooling channels (CCCs) and shows the potential of this technique in different manufacturing processes.
Design/methodology/approach
Key publications from the past two decades have been reviewed.
Findings
This study concludes that direct rapid manufacturing technique plays a dominant role in the manufacturing of mold with complicated CCC structure which helps to improve the quality of final part and productivity. The outcome based on literature review and case study strongly suggested that in the near future direct rapid manufacturing method might become standard procedure in various manufacturing processes for fabrication of complex CCCs in the mold.
Practical implications
Advanced techniques such as computer-aided design, computer-aided engineering simulation and direct rapid manufacturing made it possible to easily fabricate the effective CCC in the mold in various manufacturing processes.
Originality/value
This paper is beneficial to study the direct rapid manufacturing technique for development of the mold with CCC and its applications in different manufacturing processes.
Details
Keywords
Sobia Bhutto, Alamin Mydin, Kamran Hyder, Irshad Hussain Sarki and Gul Muhammad Rind
This study aims to investigate the relationship between workplace spirituality (WPS) and faculty critical thinking (CT) and the mediating effect of knowledge management (KM) among…
Abstract
Purpose
This study aims to investigate the relationship between workplace spirituality (WPS) and faculty critical thinking (CT) and the mediating effect of knowledge management (KM) among faculty at public universities.
Design/methodology/approach
The study employed a quantitative, cross-sectional research design to attain the objective. Using simple random sampling, the data were collected from 295 faculty members working in public universities in Sindh, Pakistan. The hypothesized relationships were tested using structural equation modeling (SEM) based on covariance and mediation analysis was conducted using Preacher and Haye’s (2008) approach.
Findings
Findings revealed a significant positive association between WPS, KM and faculty CT. In addition, the results indicated that KM played a partial mediating role in the relationship between WPS and CT.
Practical implications
Encouraging WPS can cultivate an environment of transparency, teamwork and knowledge exchange, promoting and enhancing faculty CT abilities.
Originality/value
Rare research exists regarding the connections between WPS, KM and CT in the Pakistani higher education system.
Details
Keywords
Syed Awais Ahmad Tipu and Kamel Fantazy
The current study provides new insights into the relationships between knowledge development (KD) and sustainable supply chain performance (SSCP) by exploring the mediating…
Abstract
Purpose
The current study provides new insights into the relationships between knowledge development (KD) and sustainable supply chain performance (SSCP) by exploring the mediating effects of entrepreneurial orientation (EO) in terms of innovativeness, proactiveness and risk taking.
Design/methodology/approach
Data were collected by questionnaire survey from 242 manufacturing organizations. Structural equation modeling (SEM) was used to test the hypotheses.
Findings
The results reveal that innovativeness and proactiveness have full mediating effects on the relationship between KD and SSCP. Though KD is negatively related to risk taking and has insignificant indirect effect on SSCP via risk taking, the mediating effect of risk taking remains moderate positive on the relationship between KD and SSCP.
Research limitations/implications
Given that the current study focuses on manufacturing sector, future research is needed for more comparative studies conducted in different sectors and cultural contexts. The negative link between KD and risk taking also warrants future investigation.
Practical implications
Organizations may reduce their level of risk taking due to the increase in KD. However, in order to enhance SSCP, risk taking is still needed as it mediates the relationship between KD and SSCP.
Originality/value
The mediating effects of innovativeness, proactiveness and risk taking on the relationship between KD and SSCP are unknown. Current study aims to address this gap.
Details
Keywords
Muhammad Ijaz Khan, Muhammad Riaz, Khaled Abd El-Aziz, M. Sana Ullah Sahar, Mumtaz Ahmed Qaisrani and Hafiz Tauqeer Ali
The study highlights our findings, including the confirmation of phase stability through XRD analysis, the characterization of optical properties revealing high absorption and…
Abstract
Purpose
The study highlights our findings, including the confirmation of phase stability through XRD analysis, the characterization of optical properties revealing high absorption and conductivity and the analysis of mechanical stability through elastic constants. Additionally, we present detailed results on the band gap, EELS analysis and the suitability of SrZrO3 perovskite oxides for next-generation optoelectronic devices.
Design/methodology/approach
Cubic SrZrO3 perovskite oxides were designed within the framework of density functional theory (DFT) via the CASTEP code under varying stress conditions (0–100 GPa), aiming to explore the key properties for diverse applications. The phase stability was confirmed by XRD analysis. From 0 to 40 GPa, there is an increase in the band gap from 3.330 to 3.615 eV, while it narrows from 3.493 to 3.155 eV beyond 60 GPa. The optical characteristics revealed high absorption, superior conductivity and a lower loss function. Significantly, the elastic constants (C11, C12 and C44) satisfy the Born-stability criterion, ensuring the mechanical stability of the compound. Additionally, the Poisson’s ratio, Pugh ratio (B/G), Frantsevich ratio, Cauchy pressure (PC) and anisotropy factor ensured both ductile and anisotropic characteristics. Higher values of Young’s modulus and shear modulus signify a superior ability to withstand longitudinal stresses. In the EELS analysis, distinctive energy-loss peaks resulting from absorption and emission correlated with diverse electronic transitions and energy levels associated with Sr, Zr and O atoms are used to probe the precise exploration of the electronic and optical characteristics of materials with a high degree of accuracy. Based on these findings, the designed SrZrO3 perovskite oxides are particularly suitable for applications in various optoelectronic devices.
Findings
CASTEP codes were utilized to design the cubic SrZrO3 perovskite under varying stress conditions ranging from 0 to 100 GPa. The phase stability was confirmed through XRD analysis. A distinctive trend in the band gap was observed: an increase from 3.330 eV to 3.615 eV as the stress increased from 0 to 40 GPa and a decrease from 3.493 to 3.155 above 60 GPa. A higher absorption and conductivity and a lower loss function were found for the optical properties. The mechanical stability was ensured by elastic constants (C11, C12, and C44) satisfying the Born-stability criteria. Additionally, the Poisson’s ratio, Pugh’s ratio (B/G), Frantsevich ratio, Cauchy pressure (PC) and anisotropy factor were used to verify the ductility and anisotropy of the materials. Higher values of Young’s modulus and shear modulus indicate a superior ability to withstand longitudinal stresses. EELS analysis revealed distinctive energy-loss peaks associated with Sr, Zr and O atoms, enabling precise exploration of the electronic and optical characteristics with a high degree of accuracy. As expected, the designed SrZrO3 perovskite oxides exhibit favorable properties, making them particularly suitable for next-generation optoelectronic devices.
Originality/value
In this study, we utilized DFT within the CASTEP code framework to investigate the properties of cubic SrZrO3 perovskite oxides under varying stress conditions ranging from 0 to 100 GPa. Our research aimed to explore the key properties of SrZrO3 for diverse applications, particularly in optoelectronic devices.
Details
Keywords
Thanh Tiep Le, Bich Nguyen Ngoc, Khanh Tran Ho Phuong, My Luong Hoang, Ngan Phan Kim and Ly Le Thi Cam
This research aims to investigate the relationships between organizational learning (OL), corporate social responsibility (CSR), corporate financial performance (CFP) and…
Abstract
Purpose
This research aims to investigate the relationships between organizational learning (OL), corporate social responsibility (CSR), corporate financial performance (CFP) and sustainable corporate performance (SCP) within the context of food-manufacturing family enterprises in Vietnam. Specifically, the study strengthens the combination of these three factors that collectively contribute to enhancing SCP. Furthermore, the research explores the role of service quality (SQ) and green brand innovativeness (GBI) as strategic levers for achieving a competitive edge in SCP within family enterprises.
Design/methodology/approach
This study was used the quantitative method to evaluate the influence of CSR, OL, CFP, SQ and GBI on the SCP of family enterprises. The study sample comprised 456 responses from top and middle management of organizations and used the smart partial least squares SEM (version 3.3.2) to analyze the data in the year 2024.
Findings
The study provides significant positive relationships between OL, CSR and CFP in contributing to enhancing SCP within family enterprises. Results suggest that firms with strong OL, CSR and CFP collectively could improve SCP. Furthermore, SQ and GBI emerged as integral factors in differentiating family enterprises in terms of SCP. While SQ plays a significant role in building customer loyalty and trust, GBI is crucial for positioning family enterprises as a sustainable one in the market. Thus, this study contributes to the existing academic knowledge by providing insights into how family enterprises can effectively balance economic, social and environmental objectives for long-term sustainability.
Originality/value
While previous studies have explored these factors independently, this study offers a novel perspective by examining their performances correlatively. The outcomes of this study provide valuable guidance for family enterprises’ managers, CEOs and business leaders to make strategic sustainability plans and create competitive edge when it comes to SCP.