ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer最新文献_第7页

An Electromechanical Model for Electrowetting 电润湿的机电模型

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-4130

Deng Huang, Fang Qian, Wenyao Zhang, Cunlu Zhao, Wenbo Li, Qiuwan Wang

{"title":"An Electromechanical Model for Electrowetting","authors":"Deng Huang, Fang Qian, Wenyao Zhang, Cunlu Zhao, Wenbo Li, Qiuwan Wang","doi":"10.1115/mnhmt2019-4130","DOIUrl":"https://doi.org/10.1115/mnhmt2019-4130","url":null,"abstract":"\u0000 We present an electromechanical model for analysis of electrowetting by considering the balance between an electric force and a surface tension force acting on the contact line of three phases, namely the droplet (D) phase the substrate (S) phase and the ambiance (A) phase. We show that the electric force acting on the three-phase contact line generally is contributed by the Maxwell stresses at the ambiance-substrate (A-S) interface, the droplet-substrate (D-S) interface, and the droplet-ambiance (D-A) interface. It was identified that the change of contact angle in electrowetting is essentially a consequence of the modification of the electric force on the contact line. For a classical electrowetting configuration, we show that the electric force on the contact line is mainly due to the Maxwell stresses at the D-A interface. Then we examine comprehensively how the electric force on the contact line varies with the permittivity difference between A and S phases, the contact angle and size. It was found that our model agrees excellently with the classical Yong-Lippmann (Y-L) model when the permittivities of A and S phases are equal, while the difference between the two increases as the permittivity difference between A and S phases increases. The electric force increases with the increase of the contact angle for a given droplet size. Our model approaches the Y-L model with the increasing droplet size. The findings are complementary to the classical Y-L model and provide new insights into the electrowetting.","PeriodicalId":331854,"journal":{"name":"ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129581901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anomalous Heat Diffusion in a Chain of Large Particles Through Radiative Heat Transfer 通过辐射传热的大颗粒链中的异常热扩散

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-4237

Bingyi Liu, Junming Zhao, Linhua Liu

{"title":"Anomalous Heat Diffusion in a Chain of Large Particles Through Radiative Heat Transfer","authors":"Bingyi Liu, Junming Zhao, Linhua Liu","doi":"10.1115/mnhmt2019-4237","DOIUrl":"https://doi.org/10.1115/mnhmt2019-4237","url":null,"abstract":"\u0000 Radiative heat transfer in particulate system has many applications in industry. Recently, the anomalous heat diffusion was reported for particulate system in near field thermal radiation heat transfer, and the existence of heat super-diffusive regimes was observed and the spread of heat can be described by Levy flight. In this work, attention is paid to investigate whether there is anomalous heat diffusion in far-field radiative heat transfer or not. Specifically, this study is focused on the radiative heat transport of a system, consisting of optically large particles, in the geometric optic range. Those particles are arranged in a linear chain surrounded by reflective walls and all particles are identical and equally spaced. The effect of the boundary type and particle surface emissivity on the heat diffusion is also investigated. The heat diffusion behavior in the far-field is studied based on Monte Carlo ray tracing method and the fractional diffusion equation in one dimension. The result indicates the existence of anomalous heat diffusion in the far-field by analyzing the asymptotic behavior of radiation distribution function (RDF). It’s shown that the distribution of RDF decays in power law and can be divided into two parts: for near the source particle, heat diffusive regime is super-diffusive (according to the analysis of fractional diffusion equation), while for far from the source particle, heat diffusive regime becomes sub-diffusive. Moreover, the kind of boundary type and particle wall emissivity have a significant influence on the heat diffusion of the far-field radiation heat transfer. This work will help the understanding of radiation heat transfer in particulate system in the far-field.","PeriodicalId":331854,"journal":{"name":"ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127057799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical Study on Flow and Heat and Mass Transfer in Pulsating Heat Pipe 脉动热管内流动与传热传质的数值研究

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-4012

Jianhong Liu, F. Shang, N. Efimov

{"title":"Numerical Study on Flow and Heat and Mass Transfer in Pulsating Heat Pipe","authors":"Jianhong Liu, F. Shang, N. Efimov","doi":"10.1115/mnhmt2019-4012","DOIUrl":"https://doi.org/10.1115/mnhmt2019-4012","url":null,"abstract":"\u0000 Numerical simulation was performed to establishing a two-dimensional pulsating heat pipe model, to investigate the flow and heat transfer characteristics in the pulsating heat pipe by using the Mixture and Euler models, which were unsteady models of vapor-liquid two-phase, based on the control-volume numerical procedure utilizing the semi-implicit method. Through comparing and analyzing the volume fraction and velocity magnitude of gas phase to decide which model was more suitable for numerical simulation of the pulsating heat pipe in heat and mass transfer research. It was showed there had gas phase forming in stable circulation flow in the heating section, the adiabatic section using the Mixture and Euler models respectively, and they were all in a fluctuating state at 10s, besides, the pulsating heat pipe had been starting up at 1s and stabilizing at 5s, it was all found that small bubbles in the heat pipe coalescing into large bubbles and gradually forming into liquid plugs and gas columns from the contours of volume fraction of the gas phase; through comparing the contours of gas phase velocity, it could be seen that there had further stably oscillating flow and relatively stabler gas-liquid two-phase running speed in the pulsating heat pipe used the Mixture model, the result was consistent with the conclusion of the paper[11] extremely, from this it could conclude that the Mixture model could be better simulate the vaporization-condensation process in the pulsating heat pipe, which could provide an effective theoretical support for further understanding and studying the phase change heat and mass transfer mechanism of the pulsating heat pipe.","PeriodicalId":331854,"journal":{"name":"ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121932719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Condensation of NH3 Within a Plate Heat Exchanger of Small Diameter Channel 氨在小直径通道板式换热器内的冷凝

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-3920

X. Tao, Joost A. Kirkenier, C. Ferreira

{"title":"Condensation of NH3 Within a Plate Heat Exchanger of Small Diameter Channel","authors":"X. Tao, Joost A. Kirkenier, C. Ferreira","doi":"10.1115/mnhmt2019-3920","DOIUrl":"https://doi.org/10.1115/mnhmt2019-3920","url":null,"abstract":"\u0000 Most plate heat exchangers (PHEs) have hydraulic diameters in the range of 2∼5 mm and show characteristics of both macro-channels and micro-channels. Both gravity and surface tension have non-negligible influences and determine the heat transfer and frictional pressure drop.\u0000 This paper investigates NH3 condensation in a PHE with a hydraulic diameter of 2.99 mm. The large surface tension of NH3 enhances the micro-channel characteristics. The heat transfer coefficients (HTCs) are compared with homogeneous and separated models, respectively. Both models have been previously compared with the experimental data of HFCs, hydrocarbons and HFOs. The prediction for NH3 is generally good since the deviations are small, while the sensitivity to mass fluxes and vapor qualities cannot be estimated properly. The data of frictional pressure drop are predicted by a correlation of two-phase Fanning friction factor, which is based on homogeneous flow and includes the influences of mass fluxes, vapor qualities, hydraulic diameters, chevron angles, etc. The fluid properties of NH3 are significantly different between liquid and vapor phases, and the averaged density derived from homogeneous flow is under-estimated. The prediction is improved by calculating the averaged density from the void fraction models of separated flow.","PeriodicalId":331854,"journal":{"name":"ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125637553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Nusselt Number Prediction for Slip Flow in Confined Porous Media Based on Lattice Boltzmann Method 基于点阵玻尔兹曼方法的受限多孔介质滑移流的努塞尔数预测

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-4192

A. Tariq, Zhenyu Liu, Zhiyu Mu, Huiying Wu

引用次数: 0

Interaction of Impact Liquid Drop With Splat in Spray Cooling 喷淋冷却中冲击液滴与飞溅的相互作用

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-3908

Gangtao Liang, Haibing Yu, Liuzhu Chen, S. Shen

引用次数: 0

Fluid Mixing Using Induced Charge Electro-Osmotic Transverse Flow Actuated by Asymmetrical Driving Electrode Sequence 非对称驱动电极序列诱导电荷电渗透横向流动混合流体

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-4181

Xiaoming Chen, Yukun Ren, Likai Hou, Tianyi Jiang, Hongyuan Jiang

{"title":"Fluid Mixing Using Induced Charge Electro-Osmotic Transverse Flow Actuated by Asymmetrical Driving Electrode Sequence","authors":"Xiaoming Chen, Yukun Ren, Likai Hou, Tianyi Jiang, Hongyuan Jiang","doi":"10.1115/mnhmt2019-4181","DOIUrl":"https://doi.org/10.1115/mnhmt2019-4181","url":null,"abstract":"\u0000 Microfluid mixing is an essential process in chemical analysis, drug test, and nanoparticle synthesis. Induced charge electro-osmosis (ICEO) has good capability in microfluid mixing for its reconfigurable vortex profile. We found experimentally ICEO transverse flow induced by the asymmetrical driving electrode has a good performance in disturbing the interface of two fluids. Encouraged by these aspects, we proposed a micromixer using ICEO transverse flows actuated by the asymmetrical driving electrode sequence to mix microfluids. We established a simulation model to investigate the evolution of the interface and demonstrate the work principle of this method. Moreover, we numerically explored the effects of device structure, and electrolyte characteristics on the capability of micromixer. Finally, we validated this method experimentally, and studied the effects of voltage intensity, frequency and flow rate on the mixing capability, obtaining mixing efficiency exceeding 94%. This method is a potential alternative in various microfluidic and lab-on-a-chip applications.","PeriodicalId":331854,"journal":{"name":"ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131836433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laser Ablation of Crystalline Material With and Without Water on Material Surface 晶体材料表面有水和无水的激光烧蚀

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-4211

Wenlong Yao, Li Yan, Yunshu Qi, N. Mei

引用次数: 0

Effect of Salinity on the Capturing CO2 Capabilities of Brine in Two-Dimensional Porous Media 盐度对二维多孔介质中卤水捕集CO2能力的影响

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-4256

Changzhong Zhao, Yongchen Song, Ming-Keh Chen, Yuan Chi, Yi Zhang

{"title":"Effect of Salinity on the Capturing CO2 Capabilities of Brine in Two-Dimensional Porous Media","authors":"Changzhong Zhao, Yongchen Song, Ming-Keh Chen, Yuan Chi, Yi Zhang","doi":"10.1115/mnhmt2019-4256","DOIUrl":"https://doi.org/10.1115/mnhmt2019-4256","url":null,"abstract":"\u0000 CO2 sequestration in deep saline aquifers is being intensively studied as a strategy to mitigate CO2 emission. When CO2 is injected into the saline aquifers, a series of physical and chemical reactions will take place with the brine and rock skeleton under the multiple effects of salinity, temperature, pressure, hydrodynamic and chemistry to achieve the long-term underground storage of CO2. Therefore, we used an etched homogenous glass micromodel to investigate the impact of salinity on the brine-saturated reservoirs at the CO2 injection rate of 0.05 ml·min−1, temperature 25 °C, and pressure 0.1 MPa. Five brine concentrates were set in our experiment: 0 mol/l, 1 mol/l, 2 mol/l, 3 mol/l, and 4 mol/l to represent different types of saline aquifers. Based on the experimental results, a detailed discussion about the mode transformation of displacement, CO2 saturation and wettability variation, differential pressure change between inlet and outlet was made. The major contribution of salinity is to change the viscosity of brine, which will then affect other physicochemical properties to furtherly change the behavior of microfluidics. The effect of salinity on the drainage process was analyzed specifically in this study. It was found that as the salinity improved, the capillary number increased to make the displacement mode change from capillary fingering to viscous fingering. When the viscous force was dominant, the saturation of residual brine became bigger and the variation of wettability was not obvious. At the same time, the maximum pressure promoting the displacement finished needed to be bigger as the salinity improved to overcome more viscous force. Finally, it was found that in the brine with higher salinity, salt precipitation was more obvious.","PeriodicalId":331854,"journal":{"name":"ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127522358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flow Boiling Characteristics of R410A in Horizontal Annuli of Enhanced Surface Tubes R410A在强化表面管水平环空中的流动沸腾特性

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer Pub Date : 2019-12-02 DOI: 10.1115/mnhmt2019-4039

Zhi-chuan Sun, Wei Li, Xiang Ma, Yuansheng Lin, Z. Ke, H. Ke

{"title":"Flow Boiling Characteristics of R410A in Horizontal Annuli of Enhanced Surface Tubes","authors":"Zhi-chuan Sun, Wei Li, Xiang Ma, Yuansheng Lin, Z. Ke, H. Ke","doi":"10.1115/mnhmt2019-4039","DOIUrl":"https://doi.org/10.1115/mnhmt2019-4039","url":null,"abstract":"\u0000 An experimental study on the flow boiling heat transfer in a horizontal annular passage outside the single tube using R410A. The tested tubes contain a smooth tube, a 1EHT tube (dimpled tube) and a herringbone micro-fin tube with the same outside diameter of 12.70 mm. Tests were carried out at a saturation temperature of 6 °C for a mass flux range of 8∼107 kg/m2s with a fixed inlet quality of 0.1 and three different outlet qualities (0.4, 0.6, 0.8). Changes in vapor quality and annular gap size are found to have a significant impact on boiling heat transfer in the concentric annulus. For tests in the annuli with a 25.4-mm-ID outer tube, the HTC of the herringbone micro-fin tube is highest together with the largest pressure drop. Both the annulus of 1EHT tube and the annulus of herringbone micro-fin tube show a higher boiling HTC at an outlet quality of 0.6. The larger penalty factor is found at an outlet quality of 0.8. For flow boiling in the annuli having different annular gap sizes, it is found that the heat transfer enhancement ratio decreases sharply with the increasing average quality. When the inner diameter of outer tube is 19.0 mm, HTC decreases at first and then rises slowly. The huge bubbles occurred at the low mass fluxes and the scouring effect on the heated annulus walls of high-speed flow may be responsible.","PeriodicalId":331854,"journal":{"name":"ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123442122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0