Article
Thermodynamics
Abd Rahim Abu Talib, Ali Kareem Hilo
Summary: The study found that combining a corrugated wall with a BFS channel can significantly enhance heat transfer, but also increases friction. The channel with a 4mm amplitude height and 20mm wavelength performed the best at 5000 Re, reaching a performance evaluation criterion factor of 1.33.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Metallurgy & Metallurgical Engineering
Hamid-Reza Bahrami
Summary: This study investigates the effects of a semi-porous baffle placed behind a backward-facing step on energy transfer and pressure drop. The results show that the proper length of the porous medium can enhance Nusselt numbers, with low permeable porous media providing better energy transfer.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Thermodynamics
Khalil Ur Rehman, Wasfi Shatanawi, Andac Batur Colak
Summary: This study considers a partially heated double forward-facing step and investigates the transformation of the centers of heated obstructions and the variation of Nusselt number through numerical analysis. The results indicate that the drag coefficient for partially heated obstructions decreases with the Reynolds number and the developed ANN model can accurately predict drag and lift coefficients.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Huagen Li, Kaipeng Liu, Tianfeng Liu, Run Hu
Summary: Researchers have proposed and realized a homogeneous zero-index thermal metadevice based on temperature modulation, which achieves stable camouflage and super-expansion effects without the energy consumption and inhomogeneity of high-speed rotation. The results of theoretical simulations and experiments confirm a uniform infinite effective thermal conductivity (IETC) and the corresponding thermal functionalities beyond cloaking.
Article
Thermodynamics
Cong Qi, Zi Ding, Jianglin Tu, Yuxing Wang, Yinjie Wang
Summary: The study found that increasing the number of steps will increase the Nu value of the downstream wall of the steps. The increase in flow velocity has the greatest influence on the Nu value of the lower wall of the step, and the heat exchange effect of the hybrid nanofluids is better than that of water.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
V. I. Terekhov, A. Yu. Dyachenko, Ya. J. Smulsky, B. Sunden
Summary: The influence of tab size and location on flow structure, pressure distribution, and heat transfer in the separation region behind a backward-facing step at Reynolds number Re = 4000 was experimentally investigated. The presence of tabs was found to enhance heat transfer and bring the region of maximum heat transfer closer to the step. Uneven distribution of pressure coefficients and Nusselt numbers was observed in the transverse direction due to the formation of vortical wake.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Thermodynamics
Di Yang, Bin Sun, Tiankai Xu, Binbin Liu, Hongwei Li
Summary: Nanofluids play a significant role in reducing the temperature of the bottom surface downstream of microchannels, with higher volume fractions leading to increased heat transfer coefficients. Increasing the step height enhances heat transfer efficiency, although it also results in higher flow resistance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Ayad S. Abedalh, Zaid A. Shaalan, Husam Naufal Saleh Yassien
Summary: The experimental study on convective heat transfer flow of hybrid nanofluids over a backward facing step in a heated rectangular duct under laminar flow showed significant enhancement in heat transfer and pressure drop using a mixture of Al2O3 and TiO2 solid nanoparticles in pure water. The results indicated that the Nusselt number increases with higher Reynolds number and mass fraction, while the friction factor decreases under these conditions. Enhancements of heat transfer and pressure drop were approximately 14% and 4% respectively.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Huaduo Gu, Deli Zhou, Kun Du, Weihong Li
Summary: This study thoroughly investigated the impacts of material selection and hole arrangement on the overall cooling characteristics of the impingement-pinfin-effusion based double-wall effusion system (DWES). The results showed that the stainless-steel scheme achieved the highest overall cooling effectiveness due to its superior thermal conductivity, while the polycarbonate scheme obtained the lowest overall cooling effectiveness. The study also found that employing backward film injection yielded remarkable improvements in overall cooling effectiveness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Saboura Yousefi, Mostafa Mahdavi, Seyed Soheil Mousavi Ajarostaghi, Mohsen Sharifpur
Summary: Due to rapid development in technology and improved performance of materials, thermal management is important. In this study, the application of nanofluid in a microchannel heat sink with ribs and dimples is numerically investigated. The results show that increasing the number and height of ribs leads to significant improvements in heat transfer.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Kihoon Lim, Jaeseon Lee
Summary: This study experimentally implemented a counterflow heat sink for the first time through the design of a new internal flow distribution structure, and proposed a new correlation to predict the heat transfer coefficient affected by the counterflow. The results showed significantly improved cooling performance compared to conventional heatsinks, indicating the potential for practical applications of counterflow heat sinks.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Chemical
Peymaneh Dehghan, Fatemeh Keramat, Masoud Mofarahi, Chang-Ha Lee
Summary: This study investigates the effects of an inclined step combined with different types of obstacles on the heat transfer of graphene oxide nanofluid inside a double backward-facing microchannel. The simulation results show that placing a triangular obstacle at the top of the first step significantly increases the Nusselt number and heat transfer coefficient compared to pure water. High pressure drop improves heat transfer, and the friction factor is influenced by the presence and location of triangular obstacles.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Thermodynamics
Munonyedi Egbo, Gisuk Hwang
Summary: This study focuses on the liquid supply and vapor removal limits in a downward facing orientation for a Bare Surface Evaporator with Phase-Separating Wick (BEPSW). Results show that the Critical Heat Flux (CHF) and Heat Transfer Coefficient (HTC) increase with decreasing pitch distance of the post wicks, reaching optimal values at 2.5 to 3.5 mm. The study also reveals that the CHF using 550 µm wick exceeds that of 350 µm at a given pitch distance due to higher liquid permeability.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Energy & Fuels
Ratnadeep Nath, Krishnan Murugesan
Summary: The impact of an inclined magnetic field on the thermo-fluidic behavior in a backward facing step channel filled with Cu-Al2O3/water nanofluid, associated with thermo-solutal buoyancy induced mixed convection, has been numerically investigated. The results show that, at positive buoyancy ratio, the solutal buoyancy force enhances the heat and mass transport phenomena, while increasing the inclination angle leads to a transition from convective mode to conductive mode of heat transfer.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Guangqin Huang, Ziming Liao, Shengbo Li, Chunlong Zhuang, Hongyu Zhang, Lei Cheng, Fei Gan, Ningge Xu
Summary: This study proposes a novel independent heat extraction-release double helix energy pile and investigates its heat extraction effects through numerical simulation. The results show that joint operation is more effective than independent operation, and the heat extraction effect is better when the inlet temperature of the heat-extracting pipe is lower, the flow rate is about 50L/h, and the pipe diameter is suitable.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Chemical
L. Ranganatha Swamy, N. R. Banapurmath, T. K. Chandrashekar, Manzoore Elahi M. Soudagar, M. Gul, Nik-Nazri Nik-Ghazali, M. A. Mujtaba, Kiran Shahapurkar, Umit Agbulut, Hashim M. Alshehri, A. M. Sajjan, Marjan Goodarzi
Summary: The use of oxygenated fuels as a substitute for diesel fuel in engines can effectively reduce emissions, but it also leads to increased NOx emissions, inferior HC and CO emissions, and shortened ignition delay and combustion duration.
CHEMICAL ENGINEERING COMMUNICATIONS
(2023)
Article
Mathematics, Applied
Safia Akram, Alia Razia, Mir Yasir Umair, Tuqa Abdulrazzaq, Raad Z. Homod
Summary: This article discusses the consequences of thermal and concentration convection on peristaltic pumping of hyperbolic tangent nanofluid in a non-uniform channel and the induced magnetic field. The mathematical modeling and induced magnetic field of hyperbolic tangent nanofluid are described, and the governing equations are solved using numerical techniques. The effects of different variables on concentration, temperature, volume fraction of nanoparticles, axial induced magnetic field, magnetic force function, stream functions, pressure rise, and pressure gradient are analyzed graphically.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Computer Science, Artificial Intelligence
G. Narayanan, M. Syed Ali, Hamed Alsulami, Tareq Saeed, Bashir Ahmad
Summary: This paper proposes a novel approach to solve the synchronization problem of T-S fuzzy fractional-order discrete-time complex-valued genetic regulatory networks. Several effective conditions are derived based on algebraic inequality and complex-valued linear matrix inequalities. Our results are less conservative than existing ones.
NEURAL PROCESSING LETTERS
(2023)
Article
Mathematics, Applied
Adel Alahmadi, Hamed Alsulami, S. K. Jain, Efim Zelmanov
Summary: This article reviews various constructions of wreath products of groups, semigroups, Lie algebras, and associative algebras, and discusses their realizations in matrix wreath products of associative algebras. As an application, a new version of Evans's embedding theorem [T. Evans, Embedding theorems for multiplicative systems and projective geometries, Proc. American Math. Soc. 3 (1952) 614-620] is proved.
JOURNAL OF ALGEBRA AND ITS APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Husam Abdulrasool Hasan, Jenan S. Sherza, Azher M. Abed, Hussein Togun, Nidhal Ben Khedher, Kamaruzzaman Sopian, Jasim M. Mahdi, Pouyan Talebizadehsardari
Summary: This article investigates the influence of including transverse ribs within the absorber tube in the concentrated linear Fresnel collector system on thermal and flow performance coefficients. Simulations were conducted using water as the heat transfer fluid and the results showed that the inclusion of transverse ribs significantly enhanced heat transfer rates. The average Nusselt number increased by approximately 115% at Re = 5,000 and 175% at Re = 13,000 when compared to the plain absorber tube.
FRONTIERS IN CHEMISTRY
(2023)
Article
Mathematics, Interdisciplinary Applications
Shao-Wen Yao, Omar Abu Arqub, Soumia Tayebi, M. S. Osman, W. Mahmoud, Mustafa Inc, Hamed Alsulami
Summary: The goal and importance of this paper are to predict and build accurate and convincing numerical solutions for the time-fractional diffusion wave model in its singular version. The collective cubic uniform B-spline approach and standard finite difference approach are employed for this purpose. The paper demonstrates the applications of these approaches to fractional singular-type models in fluid dynamics and electromagnetics.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2023)
Article
Mathematics
A. Alahmadi, H. Alsulami, S. K. Jain, E. Zelmanov
Summary: This paper investigates the universal enveloping algebra U(L) and the related Poisson algebra Pol(L) of finite dimensional Lie algebra L, and finds conditions for the finite generation of Lie algebras [U(L),U(L)] and [Pol(L),Pol(L)].
JOURNAL OF ALGEBRA
(2023)
Article
Multidisciplinary Sciences
Hussein Togun, S. Hamidatou, Hayder I. Mohammed, Azher. M. Abed, Husam Abdulrasool Hasan, Raad Z. Homod, Ali Wadi Al-Fatlawi, Mohaimen Al-Thamir, Tuqa Abdulrazzaq
Summary: This study investigates the thermal behavior and aerodynamic phenomena in a heated channel with varied rib configurations using computational fluid dynamics simulations. Incorporating ribs in such systems enhances heat transfer but increases flow resistance and manufacturing costs. Understanding heat exchanger theory, measurement methods, and numerical calculations are crucial for creating efficient heat exchangers.
Article
Multidisciplinary Sciences
Husam Abdulrasool Hasan, Hussein Togun, Azher M. Abed, Naef A. A. Qasem, Hayder I. Mohammed, Aissa Abderrahmane, Kamel Guedri, El Sayed M. Tag-ElDin
Summary: In this work, an innovative cooling system is utilized to minimize the temperature of lithium-ion battery cells (LiBs) and improve their performance, safety, and cycle life. The Finite Volume Method (FVM) is used to solve the continuity, momentum, and energy equations, and the computational fluid dynamics software ANSYS Fluent is employed to analyze the thermal management system for 52 LiB cells. The arrangement of batteries leads to symmetrical flow and temperature distribution in the battery pack. SiO2 distributed in water is investigated, and SiO2 nanofluid with a volume fraction of 5% shows the lowest average temperature values at all investigated Reynolds numbers. The innovative cooling system enhances the cooling process by increasing SiO2 concentrations, and a concentration of 5 vol% is recommended for better thermal diffusion and effective thermal conductivity. Increasing the Reynolds number increases flow turbulence and significantly enhances the heat transfer process.
Article
Energy & Fuels
Abdullah Bahlekeh, Hosseinali Ramezani Mouziraji, Hussein Togun, Abolfazl Ebrahimnataj Tiji, Azher M. Abed, Hayder I. Mohammed, Raed Khalid Ibrahem, Muataz S. Alhassan, Pouyan Talebizadehsardari
Summary: This study numerically analyzed the impact of fin number and size on the solidification output of a double-tube container filled with phase change material (PCM). By changing the dimensions of the fins, the heat transfer performance of PCM was examined and compared to scenarios without fins. Multiple inline configurations were explored to achieve optimal performance. The initial conditions of the heat transfer fluid (HTF) were considered in the analysis. The results showed that longer fins with higher numbers significantly improved the solidification rate of PCM.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Mathematics, Applied
Saima Yaseen, Fiza Zafar, Hamed H. Alsulami
Summary: The global positioning system (GPS) uses satellite navigation to determine locations. The Space Force flies more than 24 GPS satellites to maintain coverage when baseline satellites are serviced or deactivated. Although the additional satellites are not part of the core constellation, they can improve the GPS performance. This study focuses on solving GPS problems using iterative methods and presents a development of efficient sixth-order Jarratt-type iterative schemes for analyzing nonlinear global positioning systems.
Article
Physics, Mathematical
Aftab Hussain, Umar Ishtiaq, Hamed Al Sulami
Summary: In this paper, we introduce the concepts of fuzzy strong controlled metric spaces, fuzzy strong controlled quasi-metric spaces, and non-Archimedean fuzzy strong controlled quasi-metric spaces, and extend the well-known Banach contraction principle. We prove several fixed point results in the context of non-Archimedean fuzzy strong controlled quasi-metric space. Furthermore, we use our main result to demonstrate the existence of a solution for a recurrence problem related to the study of Quicksort algorithms.
ADVANCES IN MATHEMATICAL PHYSICS
(2023)
Article
Construction & Building Technology
Nidhal Ben Khedher, Hussein Togun, Azher M. Abed, Hussein M. Taqi Al-Najjar, Anmar Dulaimi, Hayder I. Mohammed, Jasim M. Mahdi, A. Yvaz, Pouyan Talebizadehsardari
Summary: This study investigates the effect of circular Y-shaped fin arrangement on the low thermal response rates of a heat exchanger with Paraffin phase change material. Computational fluid dynamic simulations are conducted using ANSYS software, considering fluid flow, heat transfer, and phase change process. The optimal fin configuration is determined through sensitivity analysis of the Y-shaped fin's geometrical parameters. Results show that using Y-shaped fins reduces solidification time by 22% and enhances discharging rate by 26% compared to straight fins. The length of the fins is inversely proportional to solidification time, and increasing the number of fins improves heat transfer rate significantly.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Thermodynamics
Husam Abdulrasool Hasan, Hussein Togun, Azher M. Abed, Naef A. A. Qasem, Aissa Abderrahmane, Kamel Guedri, Sayed M. Eldin
Summary: Temperature has a significant impact on the efficiency, security, and cycle life of lithium-ion battery cells. A new cooling system with a specific fluid velocity range is used to reduce the temperature of the cells. The results show that higher fluid velocity leads to better heat transfer. Among the investigated nanofluids, SiO2 exhibits the best thermal cooling for battery packs.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.