Article
Thermodynamics
Osman Ulkir, Ishak Ertugrul, Oguz Girit, Sezgin Ersoy
Summary: This study focuses on the design and analysis of micro beams using COMSOL software. Different metallic materials and input potentials were tested to observe the displacement and temperature variations in micro beams. Results showed that increasing voltage led to higher displacement and temperature, with aluminum demonstrating the highest displacement compared to other metallic materials.
Article
Engineering, Multidisciplinary
Priyanka Jena, Rajesh Gupta
Summary: The paper discusses a method of material identification based on thermal properties, which involves estimating two thermal properties for classification and application in automation.
Article
Engineering, Multidisciplinary
Manuel Caravaca Garraton, Maria del Carmen Garcia-Onsurbe, Antonio Soto-Meca
Summary: This work characterizes the delay terms in systems of delay differential equations using the Network Simulation Method, which establishes a formal equivalence between the differential equations and an electrical network. LTspice, a free circuit software, is employed for simulations and the delay terms are easily implemented by voltage-controlled voltage sources. The Network Simulation Method offers a powerful and simple alternative for solving complex systems described by delay differential equations, with significant implications for research and education.
AIN SHAMS ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
T. D. Bennett
Summary: This article studies the geometries of non-isothermal convecting plates and derives the thermal network resistances. It enriches the analytical tools for thermal designers and provides an alternative to laborious numerical analysis of complex thermal structures.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Engineering, Electrical & Electronic
Eric Tan Kai Chiang, Tomoaki Mashimo
Summary: In millimeter-scale ultrasonic motors, the choice between bending and three-wave vibration modes depends on the length of the stator. The bending mode is advantageous for longer stators (2 mm), while using the three-wave mode performs higher efficiency on shorter stators (1 mm).
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Polymer Science
Ziyou Zhang, Zhenpeng Li, Ruolin Sun, Andrew Olah, Eric Baer
Summary: Shape memory polymer films have attracted great interests for storing functional information due to their optical and mechanical variability. By blending high molecular weight polyvinyl acetate (PVAc) with polyethylene glycol (PEG) plasticizer, lower switching temperatures can be achieved. The study reveals that higher contents of PEG enhance the recovery efficiency and optical properties of micro- and nano-scale patterns. In addition, a dual switching shape memory film has been developed, enabling versatile applications with multiple switching temperatures.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Qiang Liu, Sepideh Ghodrat, Kaspar M. B. Jansen
Summary: A simple end-state model for a tube-guided SMA actuator system is proposed in this research. The properties of both the SMA and the tube material are measured and modeled, and an approximate prediction for the actuator stroke is derived. Validation experiments showed good agreement between the predicted stroke and the measurements.
MATERIALS & DESIGN
(2022)
Article
Multidisciplinary Sciences
Arkadev Roy, Saman Jahani, Carsten Langrock, Martin Fejer, Alireza Marandi
Summary: The researchers demonstrate a spectral phase transition in optical parametric oscillators, showing a high sensitivity to parameter variation and showcasing important nonlinear effects.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Braulio Beltran-Pitarch, Benny Guralnik, Neetu Lamba, Andreas R. Stilling-Andersen, Lars Norregaard, Torben M. Hansen, Ole Hansen, Nini Pryds, Peter F. Nielsen, Dirch H. Petersen
Summary: In order to develop materials with higher thermoelectric efficiency, a new method based on micro four-point probe (M4PP) was developed to determine the thermal diffusivity of a bulk material using the phase delay of the second harmonic voltage. The method was tested on two relevant thermoelectric materials, skutterudite and bismuth telluride, and showed good agreement with independent estimates. The M4PP method also demonstrated the ability to characterize materials with nonuniform and erratic electrical resistivity, such as bismuth telluride.
MATERIALS TODAY PHYSICS
(2023)
Article
Thermodynamics
Ying Li, Yong Shi, Xuehui Wang, Ding Luo, Yuying Yan
Summary: In this study, the thermal and electrical contact resistances of a thermoelectric generator (TEG) were estimated in various thermal and mechanical conditions, with different interfacial materials. The overall TCR ranged from (1.12-2.00) x 10(-3) m(2)center dot K/W with air, (0.82-1.81) x 10(-3) m(2)center dot K/W with graphene sheet, to (3.61-8.37) x 10(-4) m(2)center dot K/W with thermal grease. The corresponding ECRs under the same conditions were (1.03-1.52) x 10(-9) Omega center dot m(2), (0.56-9.60) x 10(-10) Omega center dot m(2), and (1.05-6.23) x 10(-10) Omega center dot m(2), respectively. A novel fully-connected feed-forward artificial neural network (ANN) model was also proposed to predict the overall TCR, achieving a cost-effective TCR prediction with high accuracy.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mechanics
Priyanka Jena, Rajesh Gupta
Summary: This paper proposes an approach to estimate delamination thickness of a two-layered structure using electrical analogy method. The method is fast, simple, and can be used for design phase and quality checks.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Ya Huang, Kuanming Yao, Jiyu Li, Dengfeng Li, Huiling Jia, Yiming Liu, Chun Ki Yiu, Wooyoung Park, Xinge Yu
Summary: The article reviews the current status and opportunities of different haptic feedback technologies, including force-based, thermal-based, and nerve stimulation-based interfaces. It also discusses the potential of multi-mode haptic interfaces for future development.
MATERIALS TODAY PHYSICS
(2022)
Article
Thermodynamics
Zaiguo Fu, Yongwei Li, Xiaotian Liang, Shang Lou, Zhongzhu Qiu, Zhiyuan Cheng, Qunzhi Zhu
Summary: This study investigated the performance of a photovoltaic-thermal (PVT) solar system using MPCM slurry as the cooling medium. Results showed that using MPCM slurry can improve the thermal and electrical efficiency of the system compared to using tap water or a system with a PCM layer. The study demonstrated the feasibility of enhancing performance in solar PVT systems by utilizing MPCM slurry.
Article
Polymer Science
Saeid Mehvari, Yolanda Sanchez-Vicente, Sergio Gonzalez, Khalid Lafdi
Summary: In this study, micro-size copper particles were incorporated into polyurethane using a solution mixing method and spin-coating technique to fabricate composite films. The conductivity behaviour of these composites under pressure was experimentally and numerically studied. It was found that changes in conductivity only occurred in the z-direction under applied pressure. Applied pressure reduced the thickness of the polymer film, decreasing the distance between copper particles and promoting the formation of a conductive network, making the material conductive.
Article
Engineering, Environmental
Aboozar Soleymanzadeh, Abbas Helalizadeh, Mohammad Jamialahmadi, Bahram Soltani Soulgani
Summary: The paper explores the analogy between electrical and thermal conductivities in rocks, finding that the solid part affects thermophysical properties while the pore system impacts electrical parameters. Results show a power relationship between F(T) and rock solidity, similar to the relationship between F(R) and porosity. Additionally, there is a high correlation between permeability and F(R) x F(T) for both sandstone and dolomite samples.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Robotics
Franco N. Pinan Basualdo, A. Bolopion, M. Gauthier, P. Lambert
Summary: Future developments in micromanufacturing will require advances in micromanipulation tools, with the air-water interface being an important medium that provides a good balance for manipulating micro-objects. ThermoBot, a microrobotic platform driven by a thermocapillary flow, can achieve velocities up to 10 times the body length per second.
Article
Robotics
Belal Ahmad, Michael Gauthier, Guillaume J. Laurent, Aude Bolopion
Summary: The demand for fast and precise mobile microrobots for in vitro applications in the biomedical field has been increasing. These microrobots offer wireless actuation while handling biological entities without affecting their own actuation.
IEEE TRANSACTIONS ON ROBOTICS
(2022)
Article
Automation & Control Systems
Hugo Daguerre, Sinan Ozgun Demir, Utku Culha, Francois Marionnet, Michael Gauthier, Metin Sitti, Aude Bolopion
Summary: This article introduces a new method for tracking small-scale robots using electrical impedance tomography. By conducting electrical stimulations and voltage measurements on the boundaries of the robot, its position can be deduced. The experimental validation shows the effectiveness of this method and its potential in medical applications.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Robotics
Franco N. Pinan Basualdo, Gaurav Gardi, Wendong Wang, Sinan O. Demir, Aude Bolopion, Michael Gauthier, Pierre Lambert, Metin Sitti
Summary: Traditional robotic systems are not directly applicable to micro-scale object manipulation, thus necessitating the design of micro-robotic manipulation systems. This study demonstrates a method for autonomous position control of passive particles at the air-water interface using a collective of spinning micro-disks, showcasing the system's capabilities.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2022)
Article
Biotechnology & Applied Microbiology
Clementine Lipp, Laure Koebel, Arnaud Bertsch, Michael Gauthier, Aude Bolopion, Philippe Renaud
Summary: We present a microfluidic dielectrophoretic-actuated system for trapping single cells and forming controlled cell aggregates. We propose a novel method to characterize the efficiency of dielectrophoretic trapping, taking into account both flow speed and heat generated by the traps as limiting factors for safe cell manipulation. Experimental comparison of two original designs with different manufacturing processes identifies the most efficient design, which is validated by monitoring cell membrane integrity using fluorescence imaging. We suggest design rules for adapting the traps to multiple-cell trapping, and experimentally demonstrate the formation of controlled size and composition aggregates using two different cell types. This study provides a simple manufactured tool for the controlled manipulation of particles in the composition of multicellular assemblies.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Ylona Collard, Franco N. Pinan Basualdo, Aude Bolopion, Michael Gauthier, Pierre Lambert, Nicolas Vandewalle
Summary: In this paper, the magnetocapillary interactions between particles are studied to enable self-assembly of floating crystals. The transition between different states can be triggered by rearranging the crystal or controlling its growth. External magnetic fields and laser-induced thermocapillary flows are proposed for controlling the crystal structure and guiding new particles.
SCIENTIFIC REPORTS
(2022)
Article
Robotics
Maxence Leveziel, Wissem Haouas, Guillaume J. Laurent, Michael Gauthier, Redwan Dahmouche
Summary: This article presents MiGriBot, a miniaturized parallel robot with a configurable platform and soft joints, designed to perform pick-and-place operations at the microscale. MiGriBot combines the benefits of a parallel kinematic architecture with a configurable platform and the use of soft joints, enabling it to achieve a high throughput of 10 pick-and-place cycles per second with a precision of 1 micrometer.
Article
Robotics
Maxence Leveziel, Guillaume J. Laurent, Wissem Haouas, Michael Gauthier, Redwan Dahmouche
Summary: This article presents a new robot concept specifically designed for fast and energy-efficient waste sorting applications. The robot is capable of providing simultaneous translations in space and the opening/closing of a built-in gripper. Kinematic and differential models have been developed, and a prototype has been built for validation.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2022)
Article
Automation & Control Systems
Alexis Lefevre, Vladimir Gauthier, Michael Gauthier, Aude Bolopion
Summary: The dielectrophoresis phenomenon allows for the control of particle displacement by manipulating the electric field. In this research, a Fourier series-based model is proposed to calculate the electric potential, and this model is extended to calculate the dielectrophoretic force on particles. A closed-loop controller based on the inversion of this model is used to achieve trajectory control of micrometer-size particles. Experimental results confirm the effectiveness of this closed-loop control in achieving precise trajectory control.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Chemistry, Multidisciplinary
Amelie Cot, Patrick Rougeot, Sophie Lakard, Michael Gauthier, Jerome Dejeu
Summary: This paper introduces a new method for controlling the non-contact positioning of micro-objects using chemical functionalization (3-aminopropyl) triethoxysilane-APTES), and demonstrates that this functionalization is able to concentrate a significant amount of electric charges on surfaces, generating a long-distance electric field (about 10 microns) called a large exclusion zone (EZ). The magnitude and range of the electrostatic force decrease rapidly as the ionic strength of the medium increases. Based on the proposed model, it is shown that this new way of localizing charges on micro-objects may be used for non-contact positioning.
APPLIED SCIENCES-BASEL
(2023)
Article
Robotics
Franco N. Pinan Basualdo, Aude Bolopion, Michael Gauthier, Pierre Lambert
Summary: This letter proposes a non-linear control method for a non-contact manipulation system based on thermocapillary flows to manipulate micro-objects. By steering a laser beam to locally heat the liquid surface and induce a thermocapillary flow, the system achieves stable 2D position control with a precision of 0.3mm on a 0.5mm object.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2023)
Article
Biochemical Research Methods
Alexis Lefevre, Michael Gauthier, Pauline Bourgeois, Annie Frelet-Barrand, Aude Bolopion
Summary: This paper presents an experimental bench for studying the automatic trajectory control of T-lymphocytes using dielectrophoresis. The dielectrophoretic force is computed online based on a Fourier series model, and a controller based on visual feedback is used to control the cell's position in a microfluidic chip. Experiments show successful steering of T-lymphocytes along different trajectories at a speed of five times their size per second, with an average error below 2μm. Cell viability is confirmed after the experiments, indicating that this active DEP actuation does not harm the cells.
Article
Biochemical Research Methods
Clementine Lipp, Laure Koebel, Romain Loyon, Aude Bolopion, Laurie Spehner, Michael Gauthier, Christophe Borg, Arnaud Bertsch, Philippe Renaud
Summary: The study focuses on the understanding of cell-cell interactions, particularly the interaction between a T cell receptor and its cognate peptide-major histocompatibility complex. A microfluidic tool is proposed to independently control two types of micro-sized objects, enabling the study of their adhesion state. The device has been validated and shows potential for the development of fast cell-cell interaction technologies.
Article
Automation & Control Systems
Franco Nicolas Pinan Basualdo, Olivier Stephan, Aude Bolopion, Michael Gauthier, Pierre Lambert
Summary: This paper proposes a method for position and orientation control of millimeter-scale structures at the air-water interface using laser-powered thermocapillary flows. Autonomous pose control is achieved by steering two laser spots around the structure in a closed-loop manner. Experimental results validate the effectiveness of this method.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Automation & Control Systems
Hugo Daguerre, Sinan Ozgun Demir, Utku Culha, Francois Marionnet, Michael Gauthier, Metin Sitti, Aude Bolopion
Summary: This article presents a new localization method using electrical impedance tomography to dynamically track small-scale robots, which was experimentally validated to successfully track the 2-D motion of different magnetically actuated robots.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Thermodynamics
Yunxia Ma, Fei Liu, Honggang Pan, Hongjian Zhang, Shuxia Yan, Ailing Zhang
Summary: This paper proposes a dynamically tunable and switchable perfect infrared absorber that exhibits excellent electrical regulation performance and high absorptance. The absorption mechanism is explained using a multiple interference model, and it is proven to be polarization insensitive.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
F. J. dos Santos, G. S. M. Martins, M. Strobel, L. Beckedorff, K. V. de Paiva, J. L. G. Oliveira
Summary: This study investigates the effects of inlet conditions and plate's features on the thermal-flow performance of a gasket plate heat exchanger (GPHE) and assesses the impact of a modified tightening distance on its performance. No systematic study on the combined effects of inlet conditions and assembly accuracy on GPHE performance has been conducted before.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Alok K. Ray, Dibakar Rakshit, K. Ravi Kumar, Hal Gurgenci
Summary: The low thermal conductivity of phase change materials limits the heat transfer rate and application of latent heat storage systems. This numerical study examines the impact of two passive heat transfer enhancement techniques on the thermal performance of a latent heat storage system. The results show that the orientation and position of the heat transfer fluid tube have significant effects on the charging duration, while the discharging duration remains unchanged. The combined effect of orientation and eccentricity reduces the charging duration, but increases the discharging duration compared to the concentric domain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yalu Han, Yanlong Wang, Chenyang Liu, Xinmin Hu, Yin An, Zhengcai Li, Jiaxun Jiang, Lizhi Du
Summary: This paper investigates the calculation method of thermal conductivity in NAPLs-contaminated soils. By establishing NAPLs-contaminated soil models and using the Lattice Boltzmann Method (LBM) for calculation, an optimized three-dimensional model with high computational accuracy and efficiency is obtained. The study also finds that saturation and Nz parameters have a significant impact on calculation time, while the thermal conductivity of the two-dimensional model is more sensitive to anisotropy. The influence of porosity and NAPLs content on thermal conductivity should be considered during in-situ thermal desorption.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Mostafa Taha, Song Zhao, Aymeric Lamorlette, Jean-Louis Consalvi, Pierre Boivin
Summary: For the first time, large-eddy simulations (LES) of the near-field region of large-scale fire plumes were performed using a pressure-based Lattice Boltzmann method (LBM) with low-Mach number approximation. The simulations showed quantitative agreement with experimental data and were consistent with previously-published numerical studies. The study demonstrated the computational efficiency of the proposed LBM solver in tackling fire-induced flows, suggesting LBMs as a good alternative candidate for modeling fire-related problems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weixin Zhang, Yehang Xie, Yuqiang Ding, Zhao Liu, Zhenping Feng
Summary: This study investigated the impact of upstream slot leakage on the endwall film cooling characteristics of turbine blades. Pressure Sensitive Paint (PSP) technology was used to measure the film cooling characteristics, and numerical analysis was conducted to evaluate the aerodynamic performance. It was found that increasing the mass flow ratio of the upstream slot enhanced film cooling, decreased aerodynamic losses, and reduced the strength of passage vortex. However, reducing the distance between the slot and the blade leading edge only enhanced film cooling without affecting the leakage coverage area.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rui Zhang, Zhen-lei Li, Yan-sheng Zhang, Dong Chen, Guo Yuan
Summary: This study discusses the heat transfer behavior of different jet forms on steel tubes. The results show that the annular jet performs better in terms of cooling intensity and uniformity. The cooling performances of the two jet forms are similar when the steel tube size is small. Therefore, the planar jet can be considered for smaller diameters due to its simplicity, low cost, and convenience in application.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
A. R. Khoei, A. M. Orvati Movaffagh, A. Rezaei Sameti
Summary: This paper presents a comprehensive study on the thermo-mechanical characteristics of oxide-coated aluminum nano-powder. It is found that the thermal conductivity of oxide-coated aluminum nano-powder is significantly lower than that of the bulk aluminum, and it is affected by the density and temperature.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yanjin Wang, Jintao Xiong, Lingyu Chen, Zhihai Lv, Qian Wang
Summary: A solar radiation transfer model for spray cooling double skin facade (SC-DSF) is proposed in this study. The model is validated by experimental results and various influence factors are analyzed. The effectiveness of adjusting droplet coverage rate and size is also evaluated.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Bostjan Zajec, Blaz Mikuz, Anil Kumar Basavaraj, Marko Matkovic, Matej Tekavcic, Martin Draksler, Leon Cizelj, Bostjan Koncar
Summary: We have developed an advanced experimental setup to investigate flow and heat transfer in an annular channel. The setup allows heat transfer measurements and flow visualization using a temperature-controlled inner tube. Measurements can be conducted in both single-phase and two-phase flow regimes. The setup ensures a uniform velocity field in the annular channel using specially designed inlet and outlet headers. The inner copper tube is heated by water and contains turbulators for enhanced heat transfer and thermocouples for temperature measurement. A three-dimensional conjugate heat transfer CFD model has been developed and validated to accurately estimate heat losses in the setup. This study demonstrates the importance of numerical simulations in improving the interpretation of complex experimental results.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weijie Chen, Ke Wang, Yongqing Wang, Shantung Tu, Zunchao Liu, Huijuan Su
Summary: In this study, a novel gradient porosity transpiration cooling plate structure (GP-TCPS) is proposed to alleviate heat transfer deterioration caused by non-uniform temperature distribution in transpiration cooling plate structure (TCPS). Computational fluid dynamics (CFD) and response surface method (RSM) were used for qualitative and quantitative analysis of the flow and heat transfer of GP-TCPS. The optimized structure of GP-TCPS significantly improves temperature uniformity, injection pressure, and average cooling efficiency compared to traditional TCPS.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
R. Essam, A. Elsaid, W. K. Zahra
Summary: This study presents a novel bioheat model for simulating heat transfer in skin tissue. The model offers an improved representation of thermal dynamics in the skin and has been validated using numerical solutions and experimental measurements. The study highlights the importance of incorporating vascular inlet parameters and thermal relaxation effects in the thermal profile, and suggests potential applications in thermal therapy and wound healing.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Dongbo Shi, Tao Xu, Zifeng Chen, Di Zhang, Yonghui Xie
Summary: The cooling structure design of turbine blades is crucial for the safety and reliability of the gas turbine set. This research investigates different arrangement schemes, including dimple/protrusion arrangements, to enhance the cooling performance. The results show that the arrangement scheme with both passes arranged by dimples has the best comprehensive thermal performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Emrehan Guersoy, Hayati Kadir Pazarlioglu, Mehmet Guerdal, Engin Gedik, Kamil Arslan
Summary: The thermo-hydraulic performance of Al2O3/H2O nanofluid with different nanoparticle shapes flowing in a sudden expansion tube with variable sudden expansion inclination angles and elliptical dimpled fins with different diameters were numerically investigated. The results showed that the nanoparticle shapes, sudden expansion inclination angles, and elliptical dimpled fin have significant impact on the thermo-hydraulic performance. This study reveals the novelty and importance of these factors in the research.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rukun Hu, Xinyu Huang, Xinyu Gao, Liu Lu, Xiaohu Yang, Bengt Sund
Summary: This study examines the impact of applying bottom cross-cut on PCM's spatial distribution in a horizontal LHTES unit using numerical simulation. The findings show that bottom cross-cut can improve the heat storage rate and natural convection heat transfer gain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
