Article
Chemistry, Multidisciplinary
Kevin Apmann, Ryan Fulmer, Branden Scherer, Sawyer Good, Jake Wohld, Saeid Vafaei
Summary: This study investigates the effects of a connector between two microchannels for the first time. Fe3O4 nanoparticles were introduced to enhance the heat transfer coefficient inside the microchannels, and it was observed that the connector has a significant impact on enhancing the heat transfer coefficient inside the second microchannel.
Review
Thermodynamics
Zoljargal Narankhishig, Jeonggyun Ham, Hoseong Lee, Honghyun Cho
Summary: The review covers experimental and numerical investigations on the convective heat transfer of various nanofluids, especially hybrid nanofluids. Performance optimization of nanofluid heat and mass transfer is influenced by factors such as nanofluid characteristics, synthesis method, magnetic force, nanoparticle concentration and size, and Reynolds number. Studies have shown that the magnetic field in magnetic nanoparticles can significantly enhance the convective heat transfer performance of nanofluids.
APPLIED THERMAL ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Hanifa Hanif, Sharidan Shafie
Summary: This research investigates the use of nanofluids as coolants to improve the cooling process in an electrical power system. The study takes into account the exceptional characteristics of nanofluids and considers the effects of heat radiation, viscous dissipation, and Newtonian heating. The numerical simulations and results obtained using MATLAB software are presented graphically.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Composites
Xianghui Ou, Shuangshuang Chen, Xuemin Lu, Qinghua Lu
Summary: The study presents a mechanochemical approach to prepare high thermal conductivity polyimide/boron nitride films induced by ball-milling, which is simple and efficient. The method allows for simultaneous peeling of BN platelets and surface covalent modification in one step, resulting in the formation of a heat-transfer network in the composite.
COMPOSITES COMMUNICATIONS
(2021)
Article
Chemistry, Physical
A. G. N. Sofiah, M. Samykano, K. Sudhakar, Zafar Said, A. K. Pandey
Summary: In this study, CuO/PANI nanocomposites-blended in palm oil hybrid nanofluid was prepared via a two-step method and investigated as a potential heat transfer hybrid nanofluid for the first time. The nanocomposites were successfully synthesized and characterized, and the hybrid nanofluids were prepared and stabilized without surfactants. The stability, chemical stability, thermal stability, density, rheology, and viscosity properties of the nanofluids were evaluated. It was found that the nanofluid containing 10 wt% CuO/PANI nanocomposites exhibited the highest viscosity and thermal conductivity properties.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Composites
Chenyang Xu, Erchun Li, Jinjue Zeng, Yue Wang, Tao Wang, Cong Ge, Chen Zhang, Qi Wang, Tian Gao, Yagang Yao, Xiangfen Jiang, Ya Zhang, Qian Cheng, Xue-Bin Wang
Summary: Plasma activations can effectively functionalize BN and change its hydrophobicity to hydrophilicity, achieving interfacial bonding between plasma-treated BN fillers and polyvinyl alcohol molecules. The BN/polyvinyl alcohol composite material shows a high through-plane thermal conductivity of 2.4 W m(-1) K-1 for a filling fraction of 50 wt% BN treated by N-2 plasma, offering a promising approach for the high-efficiency and low-cost fabrication of BN-based composite materials.
COMPOSITES COMMUNICATIONS
(2021)
Article
Materials Science, Composites
Xiaojie Chen, Wei Zhao, Yuancheng Zhang, Ge Shi, Yanjie He, Zhe Cui, Peng Fu, Xinchang Pang, Xiaomeng Zhang, Minying Liu
Summary: This study utilized high temperature resistant PA12T as matrix to fabricate PA12T/BN composites with excellent thermal management property, observing that the composite showed high in-plane thermal conductivity and low thermal expansion coefficient. Finite element analysis was used to reveal the thermal expansion behavior and mechanism of the composite with oriented filler structure.
COMPOSITES COMMUNICATIONS
(2022)
Article
Materials Science, Composites
Xiaojie Chen, Wei Zhao, Yuancheng Zhang, Ge Shi, Yanjie He, Zhe Cui, Peng Fu, Xinchang Pang, Xiaomeng Zhang, Minying Liu
Summary: In this study, PA12T/BN composites with oriented structure were fabricated by the injection molding method, and the results showed that the composite exhibited high thermal conductivity and low thermal expansion coefficient. The finite element analysis revealed the thermal expansion behavior and mechanism of the composite, providing important guidance for its design and application.
COMPOSITES COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Zhenhua Chen, Qinhua Wei, Gao Tang, Hongsheng Shi, Laishun Qin
Summary: With the advancement of LED technology towards high-power, the heat generated by high power poses a significant challenge to the thermal decay and quenching of fluorescent materials in the LED device, leading to reduced luminous efficiency and lifespan. To overcome this issue, fluorescent materials with high thermal stability and improved heat dissipation have been prepared using boron nitride nanomaterials. By adjusting the ratio of boric acid to urea in the raw material, different structures of boron nitride nanoparticles and nanosheets were synthesized. The addition of these materials in PiG enhances mechanical strength, heat dissipation, and luminescent properties, resulting in higher quantum efficiency and improved heat dissipation in high-power LED.
Article
Chemistry, Multidisciplinary
Adeola Borode, Thato Tshephe, Peter Olubambi, Mohsen Sharifpur, Josua Meyer
Summary: The study investigated the influence of concentration and temperature on the electrical conductivity, viscosity, and thermal conductivity of GNP/Fe2O3 hybrid nanofluids. Results showed that nanofluids exhibited superior electrical conductivity, viscosity, and thermal conductivity compared to water. The electrical conductivity and thermal conductivity increased linearly with concentration at a constant temperature, while the viscosity of the nanofluid increased with the addition of hybrid nanoparticles and decreased with temperature. Additionally, increasing the addition of hybrid nanoparticles in the base fluid enhanced the thermal conductivity of the nanofluid, and the thermal conductivity ratio increased with the addition of nanoparticles. These findings highlight the potential of GNP/Fe2O3 hybrid nanofluids for improving heat transfer and energy efficiency in various industrial applications.
Article
Thermodynamics
Waqar Ahmed, S. N. Kazi, Z. Z. Chowdhury, Mohd Rafie Johan
Summary: The thermophysical properties of ZnO@TiO2/DW composite nanofluids with various mass% concentrations were studied experimentally. The nanofluids showed enhanced thermal conductivity and heat transfer compared to the base fluid, with the 0.1 mass% concentration exhibiting the greatest improvement.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Materials Science, Composites
Takafumi Kusunose, Yoshinori Uno, Yuki Tanaka, Tohru Sekino
Summary: Improvement in anisotropic thermal conductivity was achieved by dispersing equiaxed h-BN fillers, synthesized through liquid-phase crystal growth, in epoxy composites. The thermal conductivity of 21.4 Wm(-1)K(-1) was observed for the epoxy composites containing equiaxed h-BN fillers, which is six times higher than that of platelet h-BN filler.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Maryam Zarghami Dehaghani, Omid Farzadian, Konstantinos Kostas, Fatemeh Molaei, Christos Spitas, Amin Hamed Mashhadzadeh
Summary: Controlling thermal conductivity of nanostructures is crucial for tailor-made nanodevices. This study focuses on modeling biphenylene/hexagonal Boron-Nitride (biphenylene/h-BN) superlattice nanoribbons and investigates the effects of length and superlattice period on thermal conductivity. The results show that the superlattice nanostructure has significantly lower thermal conductivity compared to pristine h-BN and biphenylene nanosheets, offering potential applications in thermoelectric and thermal insulation materials.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Review
Materials Science, Multidisciplinary
Lulu An, Yuanlie Yu, Qiran Cai, Srikanth Mateti, Lu Hua Li, Ying Ian Chen
Summary: The urgent need for ultrahigh thermally conductive materials in the electronics industry has led to the exploration of hexagonal boron nitride nano-sheets (BNNSs) as an ideal choice. This article provides a comprehensive review of various fabrication methods for BNNSs, discusses the impact of BNNS properties on their thermally conductive properties, and explores the use of BNNSs as fillers in polymer-based materials. The aim of this review is to inspire new fabrication methods and improvements for BNNS/polymer composites and promote their practical application as thermal transport/dissipation materials.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Wenhao Luo, Canfeng Wu, Liangjie Li, Tingting Jia, Shuhui Yu, Yingbang Yao
Summary: In this study, hexagonal boron nitride (h-BN) -polyetherimide (PEI) composites were prepared by aligning the h-BN particles using an external magnetic field. The composite exhibited significantly enhanced thermal conductivity and showed potential for microelectronic packaging applications due to its magnetic alignment of h-BN particles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Agricultural Engineering
Refet A. Yalcin, Hakan Erturk
BIOSYSTEMS ENGINEERING
(2020)
Article
Mechanics
Peter J. Baddoo, Melike Kurt, Lorna J. Ayton, Keith W. Moored
JOURNAL OF FLUID MECHANICS
(2020)
Article
Urology & Nephrology
Canberk Yildirim, Hakan Erturk, Kerem Pekkan, Sinan Deniz, Ege Can Serefoglu
Summary: Measurement of blood flow velocity through penile color Doppler ultrasound is commonly used for assessing erectile function, but invasive intracavernosal pressure measurement may be needed in some cases. This study developed a lumped parameter model of the penile circulation mechanism to estimate intracavernosal pressure values non-invasively. The model was validated using PDUS data and showed promising results for predicting intracavernosal pressure and changes in penile size during erection.
INTERNATIONAL JOURNAL OF IMPOTENCE RESEARCH
(2022)
Article
Optics
Refet Ali Yalcin, Hakan Erturk
Summary: This study presents a new Monte Carlo method for solving RTE in a fluorescent medium to overcome the limitations of current methods.
Article
Thermodynamics
Cayan Demirkir, Hakan Erturk
Summary: The experimental study focused on the convective heat transfer and flow behavior of graphene-water nanofluids, revealing a shift of laminar to turbulent transition towards lower Reynolds numbers with increasing nanoparticle concentration. The heat transfer coefficient and Nusselt numbers increased nearly identically at different Reynolds numbers in laminar flow for nanofluids, indicating dominance of conduction enhancement mechanisms. Beyond laminar flow regime, the enhancement of Nusselt numbers suggested that thermophoresis and Brownian motion become more effective heat transfer augmentation mechanisms.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Mechanics
Amin Mivehchi, Qiang Zhong, Melike Kurt, Daniel B. Quinn, Keith W. Moored
Summary: This study presents scaling laws for the thrust production and power consumption of a purely pitching hydrofoil in ground effect, capturing a wide range of biologically relevant parameters based on physical insights. The scaling laws, validated by both inviscid simulations and viscous experiments, can accelerate the design of bio-inspired hydrofoils oscillating near the ground or arranged side by side with two out-of-phase foils.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Energy & Fuels
Cagatay Haratoka, Refet A. Yalcin, Hakan Erturk
Summary: This study focuses on the numerical design of thermo-chromic glazings using VO2 pigments in office buildings to minimize energy consumption and consider visual comfort. The optical properties of pigmented glazing depend on pigment radius and volume fraction. The study reveals that thermo-chromic windows have significant energy-saving potential for office buildings.
Article
Engineering, Multidisciplinary
Tianjun Han, Amin Mivehchi, Melike Kurt, Keith W. Moored
Summary: This study presents a new method of measuring non-uniformly flexible foils and investigates their performance in terms of bending pattern and resonance condition. Non-resonating foils exhibit a unique bending pattern and can achieve high propulsive efficiencies. The study also discovers that non-uniformly flexible foils outperform rigid and uniformly flexible foils, and there is an optimal flexion ratio that maximizes efficiency. This work provides guidance for the development of high-performance underwater vehicles.
BIOINSPIRATION & BIOMIMETICS
(2022)
Article
Thermodynamics
Bowen Li, Bo Zhang, Jinlin Song, Run Hu, Hakan Erturk, Zixue Luo, Qiang Cheng
Summary: Fluctuational electrodynamics and minority carrier diffusion equations are used to evaluate the electric power output of a near-field tandem thermophotovoltaic (TPV) system. The results show that optimizing the radiative absorption distribution in the tandem cells can enhance the system's performance. The tandem TPV system outperforms the single-junction TPV system in the near-field regime, and the use of ITO and multilayer emitters can further improve electricity output.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Cagatay Haratoka, Refet A. Yalcin, Hakan Erturk
Summary: Thermo-chromic coatings are investigated for their energy saving performance on ordinary window glass in different climate regions of Turkey. The coatings change their optical properties based on temperature and contain vanadium dioxide (VO2) that undergoes phase transition. The study examines the energy savings and visual comfort of the coatings by modeling an office room in Izmir, Istanbul, and Ankara. The results show up to 26% and 9% energy saving potential in hot and cold climates, respectively.
Article
Engineering, Chemical
Halil Ibrahim Yazici, Hakan Erturk, Fengshan Liu
Summary: This study comprehensively analyzes the effects of necking and polydispersity in aggregate and primary particle size on the scattering matrix elements of soot aggregates. The study uses a tunable algorithm based on cluster-cluster aggregation to generate aggregate representations, and implements necking via a modified cylindrical connector model and the level-set function model with different coefficients. Scattering properties are calculated using discrete dipole approximation and multi-sphere T-matrix method. The impact of necking on the scattering matrix is evaluated using an aggregate volume based approach.
JOURNAL OF AEROSOL SCIENCE
(2023)
Article
Engineering, Chemical
Halil Ibrahim Yazici, Hakan Ertuerk, Fengshan Liu
Summary: A methodology is developed to analyze the performance of different necking models in estimating the scattering matrix elements of soot based on experiments. The results show that implementing necking has considerable effects on specific scattering matrix elements, but cannot accurately predict the overall scattering matrix elements. The modified cylindrical connector model is favored due to its simplicity.
JOURNAL OF AEROSOL SCIENCE
(2023)
Article
Thermodynamics
Hakan Ertuerk, Kyle Daun, Francis H. R. Franca, Shima Hajimirza, John R. Howell
Summary: This article introduces the concept of inverse problems in thermal radiation analysis, highlighting their complexity due to the existence of multiple solutions or no solution at all.
ASME JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Physics, Fluids & Plasmas
Melike Kurt, Amin Mivehchi, Keith Moored
Summary: The experiments showed that overall efficiency is improved when the follower foil is nearly out-of-phase synchronized with the leader foil and is directly downstream, with further improvement when the follower has a larger amplitude of motion. However, a slight decrease in collective efficiency was observed when the follower foil was slightly staggered, leading to direct vortex impingement.
Article
Engineering, Multidisciplinary
Melike Kurt, Azar Eslam Panah, Keith W. Moored
Article
Thermodynamics
Cong Li, Jiali Wang, Chenhui Wang, Yanke Jin, Yina Yao, Rui Yang
Summary: This study investigates the impact of NaCl water droplets with various concentrations on a heated surface. The results show that the impact patterns can be categorized into different types, and models are established to predict the spreading behavior of droplets with different concentrations. Additionally, high concentration droplets exhibit more violent boiling and have lower residual energy and rebound time.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
C. Barrera, V. Castro, F. Escudero, J. J. Cruz, I. Verdugo, J. Yon, A. Fuentes
Summary: This study focuses on the characterization of soot maturity and sooting propensity of anisole fuel in a controlled laminar coflow diffusion flame. The results show that the spatial distribution of soot volume fraction is enhanced near the flame centerline, while soot production is promoted near the flame wings. The temperature increase also affects the maturity of soot particles.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Roman W. Morse, Jason Chan, Tiago A. Moreira, Jared J. Valois, Evan T. Hurlburt, Jean-Marie Le Corre, Arganthael Berson, Kristofer M. Dressler, Gregory F. Nellis
Summary: This study investigates the dryout of liquid film and the role of disturbance wave frequency. Experimental results indicate that the heat transfer coefficient associated with optimal boiling conditions is maximized when the surface is dry 5% of the time, independent of pulse amplitude and frequency. Liquid-film measurements, dryout statistics, and direct observation suggest that disturbance-wave frequency can be manipulated by density-wave oscillations in the flow field.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
E. J. Vega, J. M. Montanero
Summary: In this study, we experimentally investigated the bursting of a bubble covered with a surfactant. We found that the bubble bursting time is longer compared to a surfactant-free bubble due to interfacial elasticity. Furthermore, the Marangoni stress drives liquid flow that allows the jet to escape from the end-pinching mechanism within a certain surfactant concentration range.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Guofu Sun, Yi Zhan, Tomio Okawa, Mitsuhiro Aoyagi, Akihiro Uchibori, Yasushi Okano
Summary: Experiments were conducted on liquid jets ejected from oval nozzles to investigate the effects of nozzle orifice shape on jet behavior. The study found that the liquid jet exhibited different characteristics at different liquid flow rates. Correlations were established to predict the liquid jet state and characteristics of the secondary droplets produced during jet impact onto a solid surface. This research extended the available knowledge on liquid jet behavior.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Jeonghoon Lee, Laurent Zimmer, Takeshi Saito, Shinji Nakaya, Mitsuhiro Tsue
Summary: This study investigates the effects of spatial resolution on DMD amplitudes and spatial mode strengths, and proposes scaling factors to correct for the resolution differences. The results show that the proposed scaling factors successfully normalize the amplitudes and spatial modes, allowing for quantitative comparison of data obtained with different spatial resolutions. This study is significant for analyzing spatiotemporal data in various fields.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Yanli Zhao, Shibing Kuang, Xiaoliang Zhang, Mingjun Xu
Summary: This study experimentally investigates the dynamic process of water droplet impacting different wood surfaces and analyzes and discusses the impacting phenomena, phenomena distribution, droplet spreading dynamics, and maximum spread factor. The results show that the impacting process can be distinguished by Weber numbers and Reynolds numbers, and can be predicted by mathematical expressions.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Aakhash Sundaresan, Atul Srivastava, Callum Atkinson
Summary: This study presents the first-ever application of an advanced methodology, combining two-color laser-induced phosphorescence and particle image velocimetry, to investigate the heat transfer mechanisms on the surface of a cylinder placed inside a confined square duct. The technique allows for simultaneous measurement of velocity and temperature fields, reducing the complexity and costs associated with separately measuring temperature distributions. Experimental observations show that increasing the mass flow rate enhances heat removal from the cylinder surface, and increasing the cylinder heat input enhances heat transfer in the rear portion of the cylinder.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Harish K. Patel, Sukhjeet Arora, Rutuja Chavan, Bimlesh Kumar
Summary: This study experimentally analyzed the multiscale statistical assessment of scour depth surrounding spur dikes with downward seepage. The research found that seepage affects the morphological behavior and hydrodynamic characteristics of the channel bed, leading to changes in scour formation. The rate of scour depth changes initially increases with higher seepage velocity but eventually becomes constant over time.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Justas Sereika, Paulius Vilkinis, Gediminas Skarbalius, Algis Dziugys, Nerijus Pedisius
Summary: This study experimentally investigated the pulsatile flow structure based on a transitional-type cavity. It was found that the pulsation amplitude has a more significant effect on the dynamics of recirculation zone than the pulsation frequency. Pulsatile flow can reduce the size of the recirculation zone.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Merav Arogeti, Eran Sher, Tali Bar-Kohany
Summary: This study provides a detailed exploration of the events that occur when a droplet hits a dry solid surface of various small sizes, with a focus on the deposition, receding breakup, and prompt splash phases. By utilizing non-dimensional analysis and graphical representation, the boundaries between different events are defined, and criteria for differentiation based on target-to-drop ratio, Reynolds, and Webber numbers are presented.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Tianxiong Li, Fei Wen, Yingchun Wu, Botong Wen, Lei Wang, Jinxin Guo, Xuecheng Wu
Summary: This study investigates the structure of the flow field induced by a strut in a scramjet and its influence on flame stabilization. Experimental and numerical analyses reveal that the flow field exhibits features beneficial for flame stabilization, but the asymmetry of the flow poses a challenge to flame establishment.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Syed Ehtisham Gillani, Yasir M. Al-Abdeli
Summary: This study investigates the asymmetry in bluff-body stabilised annular jets and finds that swirl can significantly mitigate the asymmetry and restore the symmetry of the jets. Moreover, increasing the Reynolds number and the swirl intensity can both decrease the asymmetry of the jets.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Utsav Bhardwaj, Rabindra Kumar, Shyama Prasad Das
Summary: This study presents an experimental investigation on flooding phenomenon in a pulsating heat pipe (PHP) unit cell, and analyzes the impact of flooding on the performance of PHP. The study recognizes three different flooding mechanisms and finds that currently accepted correlations for predicting flooding velocity are inaccurate. The study emphasizes the need for further research on flooding in PHPs.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Yunpeng Xue, Yongling Zhao, Shuo-Jun Mei, Yuan Chao, Jan Carmeliet
Summary: This study investigates the impact of building morphology on local climate, air quality, and urban microclimate. The researchers conducted an experimental investigation in a large-scale water tunnel, analyzing heat and flow fields using Laser-induced Fluorescence (LIF) and Particle Image Velocimetry (PIV). The findings show that factors such as canyon configuration, buoyant force, and approaching flow magnitude significantly influence fluid flow in street canyons, and the morphology of the street canyon dominates ventilation rate and heat flux. For example, changing the aspect ratio of a street canyon can lead to a significant change in air ventilation rate, ranging from 0.02 to 1.5 under the same flow conditions.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
