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Biomimetic Capillary Inspired Heat Pipe Wicks

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Journal of Bionic Engineering 2014年第3期11卷 469-480页

作者： Qian Wang Jiaju Hong yuying yan Energy & Sustainability Research Division of Faculty of Engineering University of Nottingham University Park Nottingham NG7 2RD UK

The possibility of mimicking desirable properties from nature accelerates material improvement and generates commercial interests. For heat pipe development, many attempts have been made in heat pipe wicks to enhance its capillary performance by mimicking biology. Constructing biporous, composite, or nanopillar wicks with aim of achieving hierarchical structure has been found in many studies. Mimicking beetle shell surface to obtain hybrid wettability shows biomimetic potential in heat pipe wicks. This paper firstly reviews some fundamental studies in biomimetics, establishing a general idea of surface wetting and capillary effect. MR/scanning of two live plants （Musa X Paradisiaca and Salix Flamingo） provides the possibility of visualising internal structures in vivo and obtaining rates of water transport in xylem vessels. In addition, by investigating the work inspired directly or indirectly from biomimetics, the role that biomimetics plays in modern heat pipe technology is revealed. Our innovation which syntheses a low level of hierarchical structure and integrates integral wicks for different heat pipe sections including evaporator, adiabatic, and condenser is introduced. Mathematical modelling in terms of capillary pressure and capillary rise rate to characterise such new structure is provided.

关键词： biomimetics heat pipe surface wetting capillary effect wick structure

Investigation of Droplet Evaporation on Copper Substrate with Different Roughness

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Journal of Bionic Engineering 2020年第4期17卷 835-842页

作者： Xin Wang Zeyu Liu Li Wang yuying yan Faculty of Engineering University of NottinghamNottingham NG72RDUnited Kingdom

In the present study,we investigated the evaporation process and deposition pattern of saline droplet on a copper substrate with different roughness under 40℃ambient *** four substrates are classified as smooth surface and rough surface based on their droplet contact *** has been found in this study that the evaporation pattern of droplets has a strong relationship to substrate *** thickness boundary of the evaporation pattern on a smooth surface is larger than that on a rough surface and the particles are closer to boundary and the tendency is more obvious on a smooth *** below factors contribute to the *** the smooth surface,the contact angle of droplet increases as the roughness *** the rough surface,the contact angle increases as the roughness *** contact angle decreasing,the evaporation rate at the boundary increases leading to the particles at the boundary more easily ***,the capillary flow is hindered by increasing the substrate roughness,while the Marangoni flow remains constant,resulting in more particles remain in the center of the droplet on the rough *** sum up,the coffee-ring formation is suppressed by increasing the substrate roughness on a copper substrate under 40℃temperature.

关键词： saline droplet evaporation surface roughness coffee ring Marangoni flow capillary flow

Droplet Deposition Pattern Affected by Different Heating Directions

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Journal of Bionic Engineering 2020年第4期17卷 795-801页

作者： Zeyu Liu yuying yan Xin Wang Xinyong Chen Fluids&Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNottinghamNG72RDUK Fluids&Thermal Engineering Research Centre University of Nottingham Ningbo 315100China School of Pharmacy Faculty of ScienceUniversity of NottinghamNottinghamNG72RDUK

The coffee ring effect commonly exists in droplet deposition patterns,which fundamentally affects scientific research and industrial applications,like pharmaceutical purification,salt manufacturing,*** researchers have tried different solutions to control the distributions of droplet deposition patterns,but most control deposits by adjusting droplet *** this work,droplet deposition patterns with different wettability are investigated by both localized and substrate heating.A whole process of droplet evaporation is *** droplet generally evaporates from Constant Contact Radius(CCR)mode to Constant Contact Angle(CCA)mode,and CCR stage occupies the most of *** results show that,without any chemicals,laser induced local heating transitions particle deposition patterns from ring-like structure to dot-like patterns on a hydrophilic surface,driving most saline solvent to the ***,a hydrophobic surface is also investigated showing that the particles tend to assemble at the central area,but the pattern is slightly different compared to that on hydrophilic *** addition,physical mechanisms of local heating and heating from substrate are also explored.

关键词： saline droplet deposition pattern local heating

Wetting transition energy curves for a droplet on a square-post patterned surface

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Science Bulletin 2017年第2期62卷 136-142页

作者： Wei Gong Yingqing Zu Sheng Chen yuying yan Fluids & Thermal Engineering Research Group Faculty of Engineering University of Nottingham Department of Aeronautics and Astronautics Fudan University

Due to the property of water repellence, biomimetic superhydrophobic surfaces have been widely applied to green technologies, in turn inducing wider and deeper investigations on superhydrophobic surfaces. Theoretical, experimental and numerical studies on wetting transitions have been carried out by researchers, but the mechanism of wetting transitions between Cassie-Baxter state and Wenzel state, which is crucial to develop a stable superhydrophobic surface, is still not fully understood. In this paper, the flee energy curves based on the transition processes are presented and discussed in detail. The exis- tence of energy barriers with or without consideration of the gravity effect, and the irreversibility of wet- ting transition are discussed based on the presented energy curves. The energy curves show that different routes of the Cassie-to-Wenzel transition and the reverse transition are the main reason for the irre- versibility. Numerical simulations are implemented via a phase field lattice Boltzmann method of large density ratio, and the simulation results show good consistency with the theoretical analysis.

关键词： Wetting transition Energy curves Lattice Boltzmann method

Numerical Study of Wetting Transitions on Biomimetic Surfaces Using a Lattice Boltzmann Approach with Large Density Ratio

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Journal of Bionic Engineering 2017年第3期14卷 486-496页

作者： Wei Gong yuying yan Sheng Chen Donald Giddings Fluids & Thermal Engineering Research Group Faculty of Engineering University of Nottingham University Park Nottingham NG7 2RD UK Center for Fluids & Thermal Engineering University of Nottingham Ningbo China

The hydrophobicity of natural surfaces has drawn much attention of scientific communities in recent years. By mimicking natural surfaces, the manufactured biomimetic hydrophobic surfaces have been widely applied to green technologies such as self-cleaning surfaces. Although the theories for wetting and hydrophobicity have been developed, the mechanism of wetting transitions between heterogeneous wetting state and homogeneous wetting state is still not fully clarified. As understanding of wetting transitions is crucial for manufacturing a biomimetic superhydrophobic surface, more fundamental discussions in this area should be carried out. In the present work, the wetting transitions are numerically studied using a phase field lattice Boltzmann approach with large density ratio, which should be helpful in understanding the mechanism of wetting transitions. The dynamic wetting transition processes between Cassie-Baxter state and Wenzel state are presented, and the energy barrier and the gravity effect on transition are discussed. It is found that the two wetting transition processes are irreversible for specific inherent contact angles and have different transition routes, the energy barrier exists on an ideally patterned surface and the gravity can be crucial to overcome the energy barrier and trigger the transition.

关键词： wetting transitions biomimetic surfaces energy barrier gravity effect numerical study lattice Boltzmann method

Thermal Analyses of Power Electronics Integrated with Vapour Chamber Cooling

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Automotive Innovation 2020年第4期3卷 328-335页

作者： Yiyi Chen yuying yan Bo Li Faculty of Engineering University of NottinghamNottingham NG72RDUK Dynex Semiconductor Limited Doddington RoadLincoln LN63LFUK Research Centre for Fluids and Thermal Engineering University of NottinghamNingbo 315100China

Insulated gate bipolar transistor(IGBT)power module is used for power switching transistor devices in the power supply and motor control circuits in both hybrid electric vehicles and electric *** target of heat flux of IGBT is continuously increasing due to the demand for power rating improvements and *** suitable efficient cooling technolo-gies,excessively high temperature and uneven temperature distribution can cause high thermal stress,eventually leading to severe module ***,highly efficient cooling solutions are highly *** chamber with phase change can provide quick heat transfer and low temperature *** study proposes a new IGBT structure integrated with vapour *** tests and simulation results indicate that the thermal and thermo-mechanical performances of IGBT integrated with vapour chamber are better than those of the IGBT with copper baseplate *** thermal resistance between the junction and heat sink is reduced from 0.25 to 0.14°C/W,and the temperature uniformity is greatly improved due to the phase change in the vapour *** simulation also investigates the thermal stress distribution,deformation and thermal fatigue lifespan of IGBT power electronics module.A reduction of 21.8%in thermal stress and an increase of 9%in lifespan of Sn-3.5Ag solder are achieved.

关键词： Power electronics IGBT Phase change cooling Thermal performances Thermal fatigue lifespan

Editorial Preface for Special Section on Thermal Management

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Automotive Innovation 2020年第4期3卷 297-298页

作者： yuying yan Liang Guo Faculty of Engineering University of NottinghamUniversity ParkNottinghamUK College of Automotive Engineering Jilin UniversityChangchunChina

Automotive thermal management technology is critical for achieving higher thermal efficiency,longer component life,better driving stability and comfort of *** the continuous advances of new energy vehicles(NEVs),the r... 详细信息

关键词： thermal rational stability

Simulation Modelling Study of Self-Assembled Nanoparticle Coatings for Retinal Implants

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Journal of Bionic Engineering 2013年第1期10卷 65-76页

作者： TomasMaul Andrzej Bargiela yuying yan Nan Gao Alexander Foss School of Computer Science University of Nottingham Malaysia Campus Jalan Broga 43500 Semenyih Malaysia School of Computer Science University of Nottingham Jubilee Campus Wollaton Road Nottingham NG8 1BB UK Faculty of Engineering University of Nottingham Nottingham NG7 2RD UK Department of Ophthalmology Queen's Medical Centre Nottingham NG7 2UH UK

The electrode resolution of current retinal prostheses is still far from matching the densities of retinal neurons. Decreasing electrode diameter increases impedance levels thus deterring effective stimulation of neurons. One solution is to increase the surface roughness of electrodes, which can be done via nanoparticle coatings. This paper explores a Lattice Gas Model of the drying-mediated self-assembly of nanoparticle mixtures. The model includes representations for different types of nanoparti- cles, solvent, vapour, substrate and the energetic relationships between these elements. The dynamical aspect of the model is determined by energy minimization, stochastic fluctuations and physical constraints. The model attempts to unravel the rela- tionships between different experimental conditions （e.g. evaporation rate, substrate characteristics and solvent viscosity） and the surface roughness of resulting assemblies. Some of the main results include the facts that the assemblies formed by nanoparticles of different sizes can boost roughness in specific circumstances and that the optimized assemblies can exhibit walled or stalagmite structures. This study provides a set of simulation modelling experiments that if confirmed in the laboratory may result in new and useful materials.

关键词： nanoparticle assemblies simulation modelling Lattice Gas Models retinal prostheses

Bio-inspired Recyclable Carbon Interface for Solar Steam Generation

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Journal of Bionic Engineering 2020年第2期17卷 315-325页

作者： Lei Shi Xinzhi Wang yanwei Hu Yurong He yuying yan School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Fluids&Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNG72RDUK Research Centre for Fluids and Thermal Engineering University of Nottingham Ningbo ChinaNingbo 315100China

Solar power,as one of renewable energy,holds potential application for producing steam which relies on high-temperature liquid by traditional ***,steam was generated by a bio-inspired strategy derived from the plants transpiration using a Printed Recyclable Carbon Membrane(PRCM).The membrane structure facilitated the concentration of carbon particles for the photoreaction and the heat generation for water evaporation,thereby improving the photo-thermal conversion *** PRCM achieved the best steady evaporation efficiency of 51.9%,which was 5.6 times higher than the value for water and recycling tests were *** carbon particles were separated from the water under the magnetism action,a convenient approach that avoided secondary pollution resulting from the disintegration of the *** preparation,low cost,and reusability of the printed carbon membrane allow for photo-thermal applications such as solar steam generation and seawater desalination.

关键词： solar steam generation photo-thermal conversion bionic heat transfer process magnetic control