Article
Mechanics
Yuan-Heng Zhang, Huan-Feng Duan, Xu-Feng Yan, Alessandro Stocchino
Summary: This paper presents an experimental study on the impact of variable solid volume fractions and aspect ratios on the flow behavior and wake structure of a centre-channel rectangular porous patch. The study establishes the importance of aspect ratio in wake vortex generation. By elongating the patch, a vortex street can be generated due to the promotion of transverse velocity gradient in the wake region. The paper also proposes non-dimensional threshold maps to express the combined effects of solid volume fraction and aspect ratio on the initiation of the wake vortex street.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
M. C. Bharathi, Ramesh B. Kudenatti
Summary: The instability of plane Poiseuille flow of viscoelastic second-order fluid in a homogeneous porous medium is studied. The effects of elasticity number E and Darcy number Da on flow stability are analyzed through the energy method and the numerical solution of generalized eigenvalue problem.
Article
Nanoscience & Nanotechnology
Fatma Cagla Durmus, Jose Miguel Molina Jorda
Summary: The development of porous materials with hierarchical porous structures has attracted great interest, as these materials exhibit properties representative of different pore scales and open up the possibility of new applications. The method discussed in this paper involves the preparation of silver foams with hierarchical porous structures by combining the replication method with dealloying, resulting in materials with pores ranging from nanometers to micrometers and exhibiting high antibacterial performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Multidisciplinary
H. Mehboob, K. Maqbool, R. Ellahi, Sadiq M. Sait
Summary: This research investigates the transport of a Jeffrey fluid through a permeable slit of microchannel under the effects of a porous medium and constant reabsorption. Utilizing physical laws of fluid mechanics, the study reveals the complexity of the flow process, showing that porous medium and viscoelastic parameters impact flow rate and shear stress, requiring more pressure for fluid flow.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2021)
Article
Mathematics, Applied
Mubbashar Nazeer, Ahmad Aziz Al Ahamdi, Ali Nasser Alzaed, Mamdooh Alwetaishi, Muhammad Waqas Nazir, Muhammad Ijaz Khan
Summary: This study investigates the comparative study of Newtonian and non-Newtonian fluids in peristaltic flow under the consideration of magnetic field in the porous inclined channel. Velocity slip, convective boundary conditions, and variable liquid properties are also taken into account. The mathematical model is developed using the Jeffrey fluid model and solved through the perturbation method. The results highlight the effects of physical parameters on velocity, temperature, and concentration profiles.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2022)
Article
Mechanics
Martin N. Azese, Jaures J. Engola, Jacques Hona, Emile Jean Yap, Yves C. Mbono Samba
Summary: This article analytically investigates the effects of transitioning surface tension on the dynamics of capillary imbibition in channels of arbitrary shape, with a focus on rectangular and circular channels. Two unsteady models for the transitioning surface tension are defined and used to highlight the transient behavior. The governing equations are rigorously analyzed using unsteady eigenfunction expansion, and the final solution and data are obtained employing the Runge-Kutta fourth-order scheme. The results are more accurate compared with previous studies. The dynamics and kinematic similarity between rectangular and circular channels are investigated, and the conditions for equivalence in both channels are highlighted.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Takayuki Suzuki, Srivathsan Kalyan, Cynthia Berlinicke, Samantha Yoseph, Donald J. Zack, Soojung Claire Hur
Summary: Viscoelastic focusing is a promising method for manipulating micro and nanoscale bioparticles. This study investigates the mechanisms and applications of viscoelastic focusing in rectangular microchannels. By varying the fluid elasticity and inertia, the flow characteristics driving cell focusing are revealed. The findings provide guidance for the application of viscoelastic focusing in flow cytometry and particle sorting, as well as valuable insights for device design.
Article
Energy & Fuels
Hossein Ebadi, Antonio Cammi, Rosa Difonzo, Jose Rodriguez, Laura Savoldi
Summary: An experimental study assessed the performance of a tubular absorber enhanced with Raschig Rings porous medium for CSP applications. Two designs with different porous lengths were compared. Results showed that the porous inserts increased pressure losses but reduced wall temperature significantly. Applying a surface coating increased solar absorption and reduced thermal losses. Integrating the porous medium changed the temperature profile and improved the energy and exergy efficiencies of the solar absorber.
Article
Mathematics
P. K. Pattnaik, S. K. Parida, S. R. Mishra, M. Ali Abbas, M. M. Bhatti
Summary: This study investigates the effects of adding copper, aluminum oxide, and single-wall carbon nanotubes metallic nanoparticles on magnetohydrodynamics water-based flow over a porous elastic surface. Mathematical modeling and numerical analysis were conducted to understand the behavior of velocity and temperature profiles, as well as engineering quantities such as Nusselt and Sherwood numbers. The addition of metallic nanoparticles enhanced nanofluid properties for energy transfer enrichment and found widespread applications in various fields of science and technology.
JOURNAL OF MATHEMATICS
(2022)
Article
Nuclear Science & Technology
Xindi Lv, Dalin Zhang, Gongle Song, Guanghui Su, Wenxi Tian, Suizheng Qiu
Summary: This paper investigates the two-phase flow pattern in the coolant channel of plate fuel elements in compact nuclear reactors. Through experiments under various conditions, including pressure, mass flow rate, inlet subcooling, channel gap, and tilt angle, three flow patterns of bubble flow, churn flow, and annular flow were obtained. Flow pattern maps were plotted, and the effects of different parameters on the flow pattern transformation were studied. This study is of great significance for understanding the subsequent heat transfer process of two-phase flow in compact nuclear reactors.
PROGRESS IN NUCLEAR ENERGY
(2023)
Article
Engineering, Mechanical
Ji Lang, Liyun Wang, Qianhong Wu
Summary: This theoretical study discusses the transient squeezing flow through a thin porous gap driven by an oscillating boundary, considering viscous, inertial, and Darcy effects. It reveals that increasing the squeezing depth enhances the oscillation of the velocity profiles due to the alternating dominance of viscous and inertial effects. The presence of porous media stabilizes the fluid field, showcasing potential applications in fields such as biomedical and industrial processes.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Mechanics
Nanda Poddar, Gourab Saha, Subham Dhar, Kajal Kumar Mondal
Summary: There is a shortage of pure drinking water worldwide, and various pollutants in water can cause diseases. This study investigates the effects of oscillatory flow and magnetic field on solute dispersion and proposes a method to reduce water pollution.
Article
Mechanics
H. J. Seybold, Izael A. Lima, Ascanio D. Araujo
Summary: The study compared two different models to analyze the impact of sedimentation on channel blocking. It was found that closing pores through different blocking methods would result in a breakdown of permeability, and pressure jumps followed a universal power-law distribution.
Article
Mechanics
Km Renu, Ashok Kumar, Abhishek K. Sharma
Summary: The study investigated the stably stratified flow in a linearly heated vertical pipe filled with a fluid-saturated porous medium, with a focus on the impact of permeability and Prandtl number on the stability of basic flow at different disturbance modes. The results demonstrate that the least stable mode depends on the values of Pr and Da, with a small range of Pr exhibiting a change in destabilizing characteristics to stabilizing characteristics for certain Da values.
Article
Metallurgy & Metallurgical Engineering
Shafqat Hussain, Shahzada M. Atif, Muhammad Sagheer, Ibraheem Jahangeer
Summary: This study examines the significance of features of squeezed viscous fluid flow in the presence of inclined magnetic field effect. The temperature equation incorporates viscous dissipation and Joule heating effects for efficient heat transfer. The dimensionless conservation equations are solved using the shooting method. The graphs and detailed discussion present the behavior of specific parameters on fluid motion, heat transfer rate, and surface drag coefficient.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Thermodynamics
A. Yataganbaba, I. Kurtbas
EXPERIMENTAL HEAT TRANSFER
(2016)
Article
Thermodynamics
Alptug Yataganbaba, Ali Kilicarslan, Irfan Kurtbas
INTERNATIONAL JOURNAL OF EXERGY
(2015)
Article
Thermodynamics
Alptug Yataganbaba, Ali Kilicarslan, Irfan Kurtbas
INTERNATIONAL JOURNAL OF REFRIGERATION
(2015)
Article
Thermodynamics
Mehmet Sener, Alptug Yataganbaba, Irfan Kurtbas
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2016)
Review
Green & Sustainable Science & Technology
Alptug Yataganbaba, Irfan Kurtbas
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2016)
Article
Thermodynamics
Nevin Celik, Emre Turgut, Yilmaz Bayazit
HEAT AND MASS TRANSFER
(2018)
Article
Thermodynamics
Nevin Celik, Gongur Pusat, Emre Turgut
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2018)
Article
Chemistry, Multidisciplinary
Filiz Ozgen, Nevin Celik
APPLIED SCIENCES-BASEL
(2019)
Article
Thermodynamics
Nevin Celik
HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Azeez Majeed Mohammed, Sinan Kapan, Murat Sen, Nevin Celik
Summary: The study experimentally analyzed the effects of forced mechanical vibration on a concentric pipe heat exchanger with turbulator inside it. Results showed that applying vibration to the turbulator increases heat transfer and pressure loss simultaneously, with increasing frequency having a larger effect than increasing acceleration or changing signal types.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Sinan Kapan, Nevin Celik, Emre Turgut, Vedat Tanyildizi
Summary: This study investigates the optimal conditions of coil wire turbulators in a heat exchanger and determines the relationship between the highest heat transfer and the lowest pressure drop. Three experimental analysis methods are used to analyze the independent parameters and obtain the best performance.
HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Nevin Celik, Beyda Tasar, Sinan Kapan, Vedat Tanyildizi
Summary: In this study, various machine learning methods were used to discuss heat transfer augmentation and pressure loss in a double pipe concentric type heat exchanger with a coiled-wire turbulator inserted in it, using regression analysis. The findings showed that the MLP and GPR models can be effective tools for calculating Nusselt number, friction factor, and thermal performance factor for the selected heat exchanger.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Zehra Ural Bayrak, Nevin Celik
Summary: This study optimizes the operating conditions that affect the current density of a PEMFC by applying the Taguchi Design of Experiment method. The optimal values for current density are obtained at an operating temperature of 313 K, a fuel flow rate of 50 lpm, an air flow rate of 300 lpm, and a fuel supply pressure of 1.5 bar. The contribution ratios of cell temperature, supply pressure, flowrate of fuel, and flowrate of air to the current density are 69.7%, 16.6%, 6.7%, and 0.9%, respectively.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Perihan Culun, Nevin Celik, Kazim Pihtili
ALEXANDRIA ENGINEERING JOURNAL
(2018)
Article
Energy & Fuels
Alptug Yataganbaba, Bengi Ozkahraman, Irfan Kurtbas
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
