Article
Thermodynamics
Rong Fu, Xuegong Hu, Hanjia Zhang, Yuying Yan, Wenbin Zhou, Jihui Wang
Summary: This study investigates the influence of Fe3O4-water nanofluids on capillary performance in microgrooves wick, aiming to enhance the thermal performance of two-phase heat transfer devices. Experimental results show that nanofluids significantly improve capillary performance by enhancing wetting and flow in the wick. Depending on temperature and particle concentration, the Capillary Performance Parameter increases by 8-75% compared to the base liquid. The mechanism behind the improvement in wetting and flow is attributed to particle migrations and aggregation within the groove.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Xinrui He, Yi Niu, Hailong Sun, Xing Chen, Zhirong Wang, Jing Jiang, Chao Wang
Summary: Transition-metal phosphides, particularly bimetallic phosphides NiCoP/CC with 3D nano-micro structure, are promising candidates for supercapacitors. The unique electronic structure of NiCoP/CC significantly enhances its energy density compared to Ni2P/CC, while the 3D nano-micro structure provides multidirectional charge transfer pathways. This study demonstrates the potential of NiCoP/CC as a high-performance electrode material for supercapacitors, offering a universal approach for rational material development.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Thermodynamics
Guochen Jiang, Ze Tian, Xiao Luo, Changhao Chen, Xinyu Hu, Lizhong Wang, Rui Peng, Hongjun Zhang, Minlin Zhong
Summary: In this study, a chemical-free ultrathin aluminum wick with dual-scale microgrooves was fabricated via two-step laser texturing. The wick demonstrated enhanced capillary performance and the interaction of liquids in dual-scale microgrooves played a key role in this enhancement. The ultrathin aluminum wick with dual-scale microgrooves showed excellent capillary performance for high-performance wick design in limited space and weight.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Guanghui Zhang, Jingchao Wang, Haoran Zhang, Tianyong Zhang, Shuang Jiang, Bin Li, Huoli Zhang, Jianliang Cao
Summary: This study successfully prepared hierarchical tubular micro-nano structured AgCl/Ag/TiO2 hybrids, which exhibited good catalytic activity and stability by controlling the dosage of AgNO3 and mass ratio of the components.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Thermodynamics
Yanjun Chen, Qinghe Tao, Deqiang He
Summary: This paper experimentally studied the capillary characteristic and thermal performance of the open vertical microgrooves heat sink using Al2O3/water nanofluid under a non-uniform electrical field. The results showed that the optimal concentration of 0.006 nanofluid and electric field could effectively reduce the wall temperature and create a circular low-temperature region.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Environmental
Ziwei Yue, Wei Zhou, Xiaoliang Ji, Yishu Wang, Fu Guo
Summary: A micro/nano Cu2-xS composite with significantly enhanced thermoelectric properties is prepared through a simple hydrothermal method. The power factor and thermal conductivity are optimized by the introduction of nanostructure and increased Cu1.96S contents, resulting in a higher maximum thermoelectric conversion efficiency value at 773 K.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Tong Chen, Wenjun Wang, Aifei Pan, Lei Hu, Xuesong Mei
Summary: This study investigates the optical properties of different single-scale surface structures fabricated through laser micro/nano-processing. The anti-reflection mechanisms are visually revealed and a novel method for preparing multi/scale structures is proposed. The results demonstrate improved absorption efficiency and infrared anti-reflection performance.
Article
Thermodynamics
Xiaoliang Wang, Jie Xu, Hongpeng Jiang, Yongda Liu, Xinru Li, Debin Shan, Bin Guo
Summary: This paper proposes a fabrication method of capillary wicks with micro-nano multiscale structures using micro hot embossing and high-pressure hydrothermal treatment. The superhydrophilic micro-nano structures achieve significantly improved critical heat flux and heat transfer coefficient simultaneously. Moreover, the fabricated micro-nano capillary wick can maintain its outstanding superhydrophilicity and superhydrophobicity even after high-pressure high-velocity fluid scouring. This cost-effective fabrication method provides an ideal approach for mass production of vapor chamber capillary wicks suitable for severe application environments.
APPLIED THERMAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Lei Xing, Cong Liu, Qiaoxin Zhang, Jingui Yu, Xuan Gong, Dong Yu, Chaoyuan Dai, Yu Feng
Summary: This paper investigates the synergistic effect of microstructures and nanostructures on the stability of superhydrophobic surfaces and discusses the influence of structure parameters on wettability. The research findings are important for enhancing our fundamental understanding of superhydrophobic surfaces and promoting their practical application.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Xun Li, Ming Li
Summary: A new hybrid micro/nanostructure was created on a ZnS substrate using an optimal Bessel femtosecond laser, improving the infrared window transmittance. The formation of nanoripples on micropores was explained as a result of SPP interference and scattering in a specific direction. The maximum average transmittance of the hybrid structure increased by 9.7% and 12.3% in the wavelength ranges of 5 to 12 µm and 8 to 12 µm, respectively. Additionally, the antireflective mechanism was explored using an electromagnetic field model based on the FDTD method, attributing the stable antireflective performance to the interface effective dielectric effect and LLFE.
Article
Chemistry, Physical
Wei Jiang, Xiaoqing Huang, Wentao Ke, Liangcheng Sheng, JunJie Li, Fankai Zhu, Wenwei Cheng, Zufang Zhang, Yuanxia Lao, Yuanlong Chen
Summary: Electrolysis of water is a green and environmentally friendly method for hydrogen production. However, the low efficiency of the oxygen evolution reaction (OER) limits its large-scale application. In this study, different micro-nano surface structures were constructed on Nickel-Cobalt-Cerium Oxide (Ni-Co-CeO2) catalytic electrodes using magnetic field-induced scanning electrodeposition. The effects of the micro-nano surface structure on catalytic performance were investigated. By optimizing the micro-nano surface structure, the Ni-Co-CeO2 catalytic electrode achieved the best OER efficiency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Eun-Jeong Bae, Shin-Woo Kang, Geun-Su Choi, Eun-Bi Jang, Dong-Hyun Baek, Byeong-Kwon Ju, Young-Wook Park
Summary: In this study, a micro-nano hybrid structure for the external light extraction layer was applied to enhance the efficiency of extracting external light from OLEDs. The micro-nano hybrid structure was formed through the reactive ion etching process using O-2 and CHF3 plasma. Experimental and theoretical analyses were conducted to compare the efficiency of different structures. The results showed that the application of the micro-nano hybrid structure improved the external light extraction efficiency by up to 38% and expanded the viewing angle profile of OLEDs. Furthermore, an effective method for enhancing the out-coupling efficiency of OLEDs was proposed by optimizing the micro-nano hybrid structure according to process conditions.
Article
Construction & Building Technology
Xiaoxiao Yu, Danning Li, Zhen Leng, Hongru Yao, Shifeng Wang
Summary: The hybridization of microscale and nanoscale tire rubber with SBS modified asphalt binder (SMB) was found to stabilize the molecular weight distribution and decrease oxidative condensation reaction during weathering. The hybrid modified asphalt exhibited improved crack resistance at low temperature and deformation resistance at high temperature, leading to enhanced natural weathering resistance of SMB.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Tengyu He, David G. Bradley, Ming Xu, Shu-Ting Ko, Baiyan Qi, Yi Li, Yong Cheng, Zhicheng Jin, Jiajing Zhou, Lekshmi Sasi, Lei Fu, Zhuohong Wu, Jingcheng Zhou, Wonjun Yim, Yu-Ci Chang, John Hanna, Jian Luo, Jesse Jokerst
Summary: Inorganic nanomaterials show promise in theranostics, but their non-degradability limits their translation. We developed degradable PEI/calcium phosphate micro/nano-composites inspired by the biosilicification process in diatoms. These composites exhibit versatile sizes and morphologies without causing cell cytotoxicity.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Analytical
Jihyeon Park, Seungju Jo, Youngsu Kim, Shakir Zaman, Daewon Kim
Summary: Recently, there has been a growing interest in researching small energy supply devices due to the emergence of IoT technologies. This research focuses on developing a new micro-nano structured design of electrodes for high performing hybrid energy systems, aiming to improve the effective surface area. The electrodes can be easily fabricated through the two-step synthesis of electrospinning and glass transition of a novel polystyrene substrate. The study also demonstrates the successful integration of the self-charging power system with wrinkled PAN/PS@PANI supercapacitor and TENG, which can store and utilize electrical energy efficiently.
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)