Article
Physics, Multidisciplinary
G. Vinod Kumar, Khalil Ur Rehman, R. V. M. S. S. K. Kumar, Wasfi Shatanawi
Summary: This study examines the influences of two-dimensional unsteady nanofluid flow over a permeable exponential stretching sheet with the impact of magnetic field parameter, thermal radiation, and a non-uniform heat source or sink. The dimensional equations are transformed into dimensionless form as ordinary differential equations and solved numerically. The results show the distributions of velocity, temperature, and species, as well as skin friction coefficients, heat transfer rate, and mass transfer rate. Comparisons with published work demonstrate agreement for skin friction factor and Nusselt number. The study also reveals the effects of Brownian motion and thermophoresis parameters on the fluid temperature, as well as the impact of unsteady parameter on wall friction and heat transfer rate.
WAVES IN RANDOM AND COMPLEX MEDIA
(2022)
Article
Mathematics
Rusya Iryanti Yahaya, Norihan Md Arifin, Ioan Pop, Fadzilah Md Ali, Siti Suzilliana Putri Mohamed Isa
Summary: This paper investigates the flow of nanofluids over a permeable stretching/shrinking surface and their impact on heat transfer performance. The study found that the thermal conductivity of nanofluids is enhanced with the increase of the heat source parameter. Cu/H2O nanofluid exhibits better heat transfer performance compared to other nanofluids.
Article
Physics, Multidisciplinary
M. D. Shamshuddin, F. Mabood
Summary: The study focuses on a numerical simulation of micropolar nanofluid flow with suspended nanoparticles on a permeable stretching sheet, revealing that an increase in the suction parameter decreases flow velocity and temperature, while injection increases temperature. Additionally, the stretching parameter significantly decreases the skin friction factor, and the heat transfer rate increases with higher values of the radiation parameter.
Article
Thermodynamics
U. S. Mahabaleshwar, K. N. Sneha, A. Chan, Dia Zeidan
Summary: This research focuses on the magnetohydrodynamics (MHD) flow and heat transfer of carbon nanotubes in the boundary layer. The velocity and temperature profiles are examined using different physical parameters and can be solved analytically. The results show that positive values of magnetohydrodynamics flow give stable profiles compared to negative values, and the thickness of the thermal boundary layer increases as the volume fraction of carbon nanotubes increases.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Priyanka Agrawal, Praveen Kumar Dadheech, R. N. Jat, Dumitru Baleanu, Sunil Dutt Purohit
Summary: This study investigates the heat transfer properties of three different radiative hybrid nanofluids flowing over a stretching surface, showing the effects of various parameters on heat transfer and suggesting potential applications in biomedical, microelectronics, thin-film stretching, lubrication, and refrigeration industries.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
Jian-Cun Zhou, Awatef Abidi, Qiu-Hong Shi, M. Riaz Khan, Aysha Rehman, Alibek Issakhov, Ahmed M. Galal
Summary: The study focused on the two-dimensional unsteady radiative stagnation point flow of a Casson fluid across a permeable stretching surface subject to a non-uniform heat source. The mathematical model of the nonlinear partial differential equations (PDEs) was converted to dimensionless ordinary differential equations (ODEs) using similarity transformations. The solution was estimated in terms of temperature, friction drag, Nusselt number, and velocity of fluid under the influence of various flow parameters.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Nepal Chandra Roy, Ioan Pop
Summary: This study investigates the flow and heat transfer behavior of a magnetohydrodynamic nanofluid past over an unsteady permeable shrinking sheet. The numerical solutions obtained show good agreement with the available solutions, and it is found that the increase in volume fraction of nanoparticles, mass transfer parameter, magnetic field parameter, and velocity ratio parameter leads to a significant increase in the local skin friction coefficient and the local Nusselt number. Moreover, all of these parameters increase the occurrence of dual solutions. The velocity and temperature of the fluid increase with a higher volume fraction of nanoparticles, while an increase in mass transfer and magnetic field parameters results in an increase in velocity but a decrease in temperature. However, an increase in the velocity ratio parameter shows the opposite effect.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Thermodynamics
Pingnan Huang, Guanping Dong, Wen Liu
Summary: This paper focuses on the optimization design of laminated-sheet microchannel heat sinks (LS-MHSs) and investigates the effects of different inlet pressures and lamination methods on the optimal design. By comparing the experimental group with the control group, the advantages of the optimized microchannel heat sink in heat transfer performance and comprehensive performance are verified.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Santosh Chaudhary, Ajay Singh, Devendra Kumar, Dumitru Baleanu
Summary: In this study, the steady and incompressible MHD movement of a viscous nanofluid past a non-linear stretching plate, considering heat generation and the presence of a permeable medium, was mathematically investigated. The impacts of porosity and heat generation were explored, and numerical solutions were obtained using MATLAB software. The results showed that porous media parameter affected the velocity profile, while the temperature and mass distribution exhibited contrasting responses. The findings of this study can be applied to the design of high-temperature processing operations.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This study proposes a unique model to investigate the unsteady stagnation point flow in a hybrid nanofluid induced by an exponentially permeable stretching/shrinking sheet with a magnetic field. The results show that the skin friction coefficient and local Nusselt number increase by enhancing the suction/injection parameter and nanoparticles volume fraction.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2021)
Article
Engineering, Multidisciplinary
Ying-Qing Song, Aamir Hamid, Tian-Chuan Sun, M. Ijaz Khan, Sumaira Qayyum, R. Naveen Kumar, B. C. Prasannakumara, Sami Ullah Khan, Ronnason Chinram
Summary: This study presents an analysis of an unsteady and incompressible flow of Williamson nanoliquid in the presence of variable thermal characteristics. By utilizing appropriate similarity variables, the equations for energy, momentum, and mass are converted into non-linear ODEs. The numerical solution of the boundary value problem is successfully implemented using a computer algorithm, confirming the accuracy of the results.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Serdar Ozguc, Liang Pan, Justin A. Weibel
Summary: This study explores the utilization of additive manufacturing to enhance the design of microchannel heat sinks, utilizing a permeable membrane microchannel design for effective heat exchange surfaces. Optimized designs offer improved thermal resistance compared to standard microchannel designs.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Zhongnong Zhang, Chun Lou
Summary: This paper presents an improved thermodynamic analysis method for evaluating the irreversibility and efficiency of conductive-radiative heat transfer processes. The method calculates the local entropy generation rates and applies exergy analysis to determine the stored exergy and exergetic efficiency of the system. The numerical analysis investigates the effects of heat source distribution, conductive-radiative coefficient, and total heat generation rate on entropy generation and stored exergy of the system.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Antonio Colanera, Alessandro Della Pia, Matteo Chiatto, Luigi de Luca, Francesco Grasso
Summary: This study analyzes the dynamics of a gravitational liquid sheet under different parameters using numerical simulation data and various decomposition methods, revealing distinct fluid motion characteristics in the supercritical and subcritical regimes.
Article
Engineering, Multidisciplinary
Masood Khan, Muhammad Yasir, Ali Saleh Alshomrani, Sivanandam Sivasankaran, Yaser Rajeh Aladwani, Awais Ahmed
Summary: This study focuses on the time-dependent flow of non-Newtonian fluids and investigates the thermal and solutal transport. The research reveals that the strength of homogeneous and heterogeneous reactions enhances the concentration of catalysts at the surface, and the non-uniform heat source/sink parameter plays a major role in determining the heat transportation rate.
AIN SHAMS ENGINEERING JOURNAL
(2022)
Article
Mathematics, Applied
Hao Liu, Yuzhe Li
Summary: This paper investigates the finite-time stealthy covert attack on reference tracking systems with unknown-but-bounded noises. It proposes a novel finite-time covert attack method that can steer the system state into a target set within a finite time interval while being undetectable.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Nikolay A. Kudryashov, Aleksandr A. Kutukov, Sofia F. Lavrova
Summary: The Chavy-Waddy-Kolokolnikov model with dispersion is analyzed, and new properties of the model are studied. It is shown that dispersion can be used as a control mechanism for bacterial colonies.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Qiang Ma, Jianxin Lv, Lin Bi
Summary: This paper introduces a linear stability equation based on the Boltzmann equation and establishes the relationship between small perturbations and macroscopic variables. The numerical solutions of the linear stability equations based on the Boltzmann equation and the Navier-Stokes equations are the same under the continuum assumption, providing a theoretical foundation for stability research.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Samuel W. Akingbade, Marian Gidea, Matteo Manzi, Vahid Nateghi
Summary: This paper presents a heuristic argument for the capacity of Topological Data Analysis (TDA) to detect critical transitions in financial time series. The argument is based on the Log-Periodic Power Law Singularity (LPPLS) model, which characterizes financial bubbles as super-exponential growth (or decay) with increasing oscillations approaching a tipping point. The study shows that whenever the LPPLS model fits the data, TDA generates early warning signals. As an application, the approach is illustrated using positive and negative bubbles in the Bitcoin historical price.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Xavier Antoine, Jeremie Gaidamour, Emmanuel Lorin
Summary: This paper is interested in computing the ground state of nonlinear Schrodinger/Gross-Pitaevskii equations using gradient flow type methods. The authors derived and analyzed Fractional Normalized Gradient Flow methods, which involve fractional derivatives and generalize the well-known Normalized Gradient Flow method proposed by Bao and Du in 2004. Several experiments are proposed to illustrate the convergence properties of the developed algorithms.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Lianwen Wang, Xingyu Wang, Zhijun Liu, Yating Wang
Summary: This contribution presents a delayed diffusive SEIVS epidemic model that can predict and quantify the transmission dynamics of slowly progressive diseases. The model is applied to fit pulmonary tuberculosis case data in China and provides predictions of its spread trend and effectiveness of interventions.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Shuangxi Huang, Feng-Fei Jin
Summary: This paper investigates the error feedback regulator problem for a 1-D wave equation with velocity recirculation. By introducing an invertible transformation and an adaptive error-based observer, an observer-based error feedback controller is constructed to regulate the tracking error to zero asymptotically and ensure bounded internal signals.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Weimin Liu, Shiqi Gao, Feng Xu, Yandong Zhao, Yuanqing Xia, Jinkun Liu
Summary: This paper studies the modeling and consensus control of flexible wings with bending and torsion deformation, considering the vibration suppression as well. Unlike most existing multi-agent control theories, the agent system in this study is a distributed parameter system. By considering the mutual coupling between the wing's deformation and rotation angle, the dynamics model of each agent is expressed using sets of partial differential equations (PDEs) and ordinary differential equations (ODEs). Boundary control algorithms are designed to achieve control objectives, and it is proven that the closed-loop system is asymptotically stable. Numerical simulation is conducted to demonstrate the effectiveness of the proposed control scheme.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Gourav Mandal, Lakshmi Narayan Guin, Santabrata Chakravarty
Summary: The ecological framework investigates the dynamical complexity of a system influenced by prey refuge and alternative food sources for predators. This study provides a thorough investigation of the stability-instability phenomena, system parameters sensitivity, and the occurrence of bifurcations. The bubbling phenomenon, which indicates a change in the amplitudes of successive cycles, is observed in the current two-dimensional continuous system. The controlling system parameter for the bubbling phenomena is found to be the most sensitive. The prediction and identification of bifurcations in the dynamical system are crucial for theoretical and field researchers.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Damian Trofimowicz, Tomasz P. Stefanski, Jacek Gulgowski, Tomasz Talaska
Summary: This paper presents the application of control engineering methods in modeling and simulating signal propagation in time-fractional electrodynamics. By simulating signal propagation in electromagnetic media using Maxwell's equations with fractional-order constitutive relations in the time domain, the equations in time-fractional electrodynamics can be considered as a continuous-time system of state-space equations in control engineering. Analytical solutions are derived for electromagnetic-wave propagation in the time-fractional media based on state-transition matrices, and discrete time zero-order-hold equivalent models are developed and their analytical solutions are derived. The proposed models yield the same results as other reference methods, but are more flexible in terms of the number of simulation scenarios that can be tackled due to the application of the finite-difference scheme.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Yuhao Zhao, Fanhao Guo, Deshui Xu
Summary: This study develops a vibration analysis model of a nonlinear coupling-layered soft-core beam system and finds that nonlinear coupling layers are responsible for the nonlinear phenomena in the system. By using reasonable parameters for the nonlinear coupling layers, vibrations in the resonance regions can be reduced and effective control of the vibration energy of the soft-core beam system can be achieved.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
S. Kumar, H. Roy, A. Mitra, K. Ganguly
Summary: This study investigates the nonlinear dynamic behavior of bidirectional functionally graded plates (BFG) and unidirectional functionally graded plates (UFG). Two different methods, namely the whole domain method and the finite element method, are used to formulate the dynamic problem. The results show that all three plates exhibit hardening type nonlinearity, with the effect of material gradation parameters being more pronounced in simply supported plates.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Isaac A. Garcia, Susanna Maza
Summary: This paper analyzes the role of non-autonomous inverse Jacobi multipliers in the problem of nonexistence, existence, localization, and hyperbolic nature of periodic orbits of planar vector fields. It extends and generalizes previous results that focused only on the autonomous or periodic case, providing novel applications of inverse Jacobi multipliers.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Yongjian Liu, Yasi Lu, Calogero Vetro
Summary: This paper introduces a new double phase elliptic inclusion problem (DPEI) involving a nonlinear and nonhomogeneous partial differential operator. It establishes the existence and extremality results to the elliptic inclusion problem and provides definitions for weak solutions, subsolutions, and supersolutions.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Mathematics, Applied
Shangshuai Li, Da-jun Zhang
Summary: In this paper, the Cauchy matrix structure of the spin-1 Gross-Pitaevskii equations is investigated. A 2 x 2 matrix nonlinear Schrodinger equation is derived using the Cauchy matrix approach, serving as an unreduced model for the spin-1 BEC system with explicit solutions. Suitable constraints are provided to obtain reductions for the classical and nonlocal spin-1 GP equations and their solutions, including one-soliton solution, two-soliton solution, and double-pole solution.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)