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International journal of micro-nano scale transport最新文献

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Blood flow in non-circular microchannel under pulsating condition 脉动条件下非圆形微通道内的血流
International journal of micro-nano scale transport Pub Date : 2013-03-01 DOI: 10.1260/1759-3093.4.1-2.33
Nishant Kumar, A. Prabhakar, Mukul D. Tikekar, S. Singh, A. Agrawal
{"title":"Blood flow in non-circular microchannel under pulsating condition","authors":"Nishant Kumar, A. Prabhakar, Mukul D. Tikekar, S. Singh, A. Agrawal","doi":"10.1260/1759-3093.4.1-2.33","DOIUrl":"https://doi.org/10.1260/1759-3093.4.1-2.33","url":null,"abstract":"With the advent of point-of-care diagnostics systems, investigation into properties of blood at micron scales is gaining fundamental importance. Past research has shown that blood displays significantly different properties at small scales than at conventional scales. This study investigates properties of blood flow in small non-circular passages (hydraulic diameter: 95-960 μm) under pulsatile condition. The observations are compared with flow of water under otherwise similar conditions. Prominent observation includes a more stable response to abrupt mass flow rate fluctuations as compared to water, which is attributed to the presence of deformable cells in blood. The study also reveals that, the pressure drop for blood flow with pulsations is less than for steady condition with the difference increasing with a reduction in microchannel size and flow rate. Such a comparative study facilitates development of models for blood flow at micro-scales, and will eventually aid in the design of future micro-Total ...","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"4 1","pages":"33-50"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151936","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: 6
Investigation of the effect of fluid slip on heat transfer in the thin-film region in a micro-channel 流体滑移对微通道薄膜区传热影响的研究
International journal of micro-nano scale transport Pub Date : 2012-09-01 DOI: 10.1260/1759-3093.3.3-4.103
R. Gorla, D.G.R. Sharma
{"title":"Investigation of the effect of fluid slip on heat transfer in the thin-film region in a micro-channel","authors":"R. Gorla, D.G.R. Sharma","doi":"10.1260/1759-3093.3.3-4.103","DOIUrl":"https://doi.org/10.1260/1759-3093.3.3-4.103","url":null,"abstract":"A theoretical study was undertaken to check the influence of interfacial slip on evaporation of a thin liquid film in a microfluidic channel. The disjoining pressure and the capillary force which drive the liquid flow at the liquid-vapor interface in thin film region are adopted. The evaporating thin film region is an extended meniscus beyond the apparent contact line at a liquid/solid interface. Thin film evaporation plays a key role in a highly efficient heat pipe. Slip length was found to affect the heat transfer in the microchannel by altering the thin film geometry.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"3 1","pages":"103-112"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151817","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
Decreasing of quantity of radiation defects in an implanted-junction rectifiers by using overlayers 利用复盖层减少植入结整流器辐射缺陷的数量
International journal of micro-nano scale transport Pub Date : 2012-09-01 DOI: 10.1260/1759-3093.3.3-4.119
E. Pankratov, E. Bulaeva
{"title":"Decreasing of quantity of radiation defects in an implanted-junction rectifiers by using overlayers","authors":"E. Pankratov, E. Bulaeva","doi":"10.1260/1759-3093.3.3-4.119","DOIUrl":"https://doi.org/10.1260/1759-3093.3.3-4.119","url":null,"abstract":"We introduce an approach to decrease quantity of radiation defects in area of implanted-heterojunction rectifier. The approach based on implantation of ions of dopant in a homogenous sample, overgrowth of the damaged area and annealing of radiation defects. In this situation under spatial conditions one can obtain decreasing of quantity of radiation defects.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"3 1","pages":"119-130"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151834","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: 33
Temperature dependence of free-molecular gaseous heat flow in unsealed system open to surrounding ambient 对周围环境开放的非密封系统中自由分子气体热流的温度依赖性
International journal of micro-nano scale transport Pub Date : 2012-09-01 DOI: 10.1260/1759-3093.3.3-4.113
A. Pandhari, D. Hasselman
{"title":"Temperature dependence of free-molecular gaseous heat flow in unsealed system open to surrounding ambient","authors":"A. Pandhari, D. Hasselman","doi":"10.1260/1759-3093.3.3-4.113","DOIUrl":"https://doi.org/10.1260/1759-3093.3.3-4.113","url":null,"abstract":"Equipment designed for manufacturing or testing of materials at elevated temperatures is often open to and at the pressure of the surrounding ambient. Since, it is an open system, with an increase in temperature the gas phase is expected to expand. This causes reduction in the density of the gas phase within the components or samples contained within the equipment. This reduction in density is linearly proportional to an increase in the temperature. As a consequence, because of its direct dependence on gas density, the rate of gaseous heat flow in the free-molecular regime within these components or samples should exhibit a corresponding decrease with increasing temperature as well. An analysis of this effect conducted by incorporating the effect of temperature on density at constant pressure in the original Knudsen-Kennard formulation, showed that the rate of gaseous heat transfer in the free-molecular regime in an open system at constant pressure is expected to exhibit a reciprocal square root dependenc...","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"3 1","pages":"113-118"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151825","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
Simulation of droplet impact on super hydrophobic surface 液滴撞击超疏水表面的模拟
International journal of micro-nano scale transport Pub Date : 2012-09-01 DOI: 10.1260/1759-3093.3.3-4.131
Douglas F. Johnson, Sarit K. Das
{"title":"Simulation of droplet impact on super hydrophobic surface","authors":"Douglas F. Johnson, Sarit K. Das","doi":"10.1260/1759-3093.3.3-4.131","DOIUrl":"https://doi.org/10.1260/1759-3093.3.3-4.131","url":null,"abstract":"Super hydrophobic surfaces find uses in many applications; therefore proper design of super hydrophobic surfaces is very crucial. A lot of work has already been done for static droplets and super hydrophobic surface interactions. There have also been some significant experiments carried out for dynamic droplet impact on super hydrophobic surfaces. The present work focuses on the super hydrophobic surface under dynamic conditions, with the study predominantly carried out through numerical simulation. Various parameters during impact and time variance after impact (typically up to 10 μs) were considered. The transition from water hammer pressure (order of ρCV) to flow pressure (order of 1/2 ρV2) is taken as the main parameter of analysis. During water hammer pressure domain, a strong tendency to cause wetting (Wenzel state) is seen. During flow pressure domain, wetting tendency is significantly reduced (Cassie-Baxter state). These states and the transition from one to the other are very crucial to the desig...","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"3 1","pages":"131-140"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151874","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
Fluctuating Hydrodynamics Approach for the Simulation of Nanoparticle Brownian Motion in a Newtonian Fluid. 牛顿流体中纳米粒子布朗运动模拟的波动流体力学方法。
International journal of micro-nano scale transport Pub Date : 2012-06-01 DOI: 10.1260/1759-3093.3.1-2.13
B Uma, P S Ayyaswamy, R Radhakrishnan, D M Eckmann
{"title":"Fluctuating Hydrodynamics Approach for the Simulation of Nanoparticle Brownian Motion in a Newtonian Fluid.","authors":"B Uma,&nbsp;P S Ayyaswamy,&nbsp;R Radhakrishnan,&nbsp;D M Eckmann","doi":"10.1260/1759-3093.3.1-2.13","DOIUrl":"https://doi.org/10.1260/1759-3093.3.1-2.13","url":null,"abstract":"<p><p>The Brownian motion of a nanoparticle in an incompressible Newtonian fluid (quiescent or fully developed Poiseuille flow) has been investigated with an arbitrary Lagrangian-Eulerian based finite element method. Results for the motion in a compressible fluid medium are estimated. Thermal fluctuations from the fluid are implemented using a fluctuating hydrodynamics approach. The instantaneous flow around the particle and the particle motion are fully resolved. Carriers of two different sizes with three different densities have been investigated (nearly neutrally buoyant). The numerical results show that (a) the calculated temperature of the nearly neutrally buoyant Brownian particle in a quiescent fluid satisfies the equipartition theorem; (b) the translational and rotational decay of the velocity autocorrelation functions result in algebraic tails, over long time; (c) the translational and rotational mean square displacements of the particle obeys Stokes-Einstein and Stokes-Einstein-Debye relations, respectively. Larger the particle, longer the time taken to attain this limit; and (d) the parallel and perpendicular diffusivities of the particle closer to the wall are consistent with the analytical results, where available.</p>","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"3 1-2","pages":"13-20"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1260/1759-3093.3.1-2.13","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"31661523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Performance of a Conceptual Counter-flow MCHE operated on CuO-Water Nanofluid: Influence of Geometry 概念逆流MCHE在CuO-Water纳米流体上的性能:几何形状的影响
International journal of micro-nano scale transport Pub Date : 2012-06-01 DOI: 10.1260/1759-3093.3.1-2.1
Avdhesh Sharma
{"title":"Performance of a Conceptual Counter-flow MCHE operated on CuO-Water Nanofluid: Influence of Geometry","authors":"Avdhesh Sharma","doi":"10.1260/1759-3093.3.1-2.1","DOIUrl":"https://doi.org/10.1260/1759-3093.3.1-2.1","url":null,"abstract":"Microchannel heat exchangers (MCHE) can be designed with different channel geometry such as circular, triangular, rectangular, square, trapezoidal and hexagonal. In this article, the influence of channel geometry on thermal, hydraulic and overall performance of counter flow MCHE operated on CuO-water nanofluid flow has been highlighted. Herein, Nusselt and Poiseuille number for different channel shapes and thermo-physical properties of CuO-water nanofluid (viz., thermal conductivity, viscosity…) have been designed either empirically or adopted from literature. Results of pumping power with trapezoidal geometry MCHE is found to be highly sensitive with nanofluid flow. Rectangular shape counter flow MCHE gives highest thermal effectiveness, while iso-triangular geometry gives best overall performance by converting the pressure energy into thermal energy.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"3 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151687","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
Assessment of Aviation Turbine Fuel-TiO2 Nanofluid for Heat Transfer Augmentation in Rocket Engines 航空涡轮燃料- tio2纳米流体对火箭发动机增热性能的评价
International journal of micro-nano scale transport Pub Date : 2012-06-01 DOI: 10.1260/1759-3093.3.1-2.35
Sandipkumar Sonawane, U. Bhandarkar, B. Puranik, Sanjay Kumar
{"title":"Assessment of Aviation Turbine Fuel-TiO2 Nanofluid for Heat Transfer Augmentation in Rocket Engines","authors":"Sandipkumar Sonawane, U. Bhandarkar, B. Puranik, Sanjay Kumar","doi":"10.1260/1759-3093.3.1-2.35","DOIUrl":"https://doi.org/10.1260/1759-3093.3.1-2.35","url":null,"abstract":"Nanofluids are suspensions of high thermal conductivity nanoparticles in a base fluid, and offer potential to enhance the thermal conductivity and heat transfer performance of the base fluid. The present work measures the thermo-physical properties, heat transfer performance and pressure loss characteristics of Aviation Turbine Fuel (ATF)-titanium oxide (TiO2) nanofluid. The experimental results show that the enhancement in the thermal conductivity is approximately 15% at a particle volume concentration of 0.3%, whereas the viscosity of the nanofluid increases upto 35% at the same particle volume concentration. Comparing the heat transfer coefficients with those of pure ATF at the same pressure drop, a maximum enhancement of 18% is observed at 0.3% particle volume concentration.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"3 1","pages":"35-42"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151705","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
Bioseparation in a Microfluidic Channel Using Magnetic Field Flow Fractionation 利用磁场流分馏的微流控通道生物分离
International journal of micro-nano scale transport Pub Date : 2012-06-01 DOI: 10.1260/1759-3093.3.1-2.21
N. Modak, A. Pal, A. Datta, R. Ganguly
{"title":"Bioseparation in a Microfluidic Channel Using Magnetic Field Flow Fractionation","authors":"N. Modak, A. Pal, A. Datta, R. Ganguly","doi":"10.1260/1759-3093.3.1-2.21","DOIUrl":"https://doi.org/10.1260/1759-3093.3.1-2.21","url":null,"abstract":"Magnetophoretic field flow fractionation (FFF) is a promising technique for bioseparation in microfluidic channels for micro-total analysis systems (μ-TAS) applications. A numerical study of FFF of magnetic microspheres of two different sizes in a micro-channel under a transverse magnetic field is studied. Due to the difference in the particle magnetophoretic mobility, particles develop different transverse velocities leading to their separation through two different outlets of the microchannel. Capture efficiency and separation index for the particles are computed at the two outlets, and their variations under different parametric conditions, viz., particle size and susceptibility, magnetic dipole strengths and positions, fluid viscosity and flow velocity, are characterized. Parametric studies show that the capture efficiency and separation index figures are high within a very narrow zone of operating conditions. Beyond this regime, the particles are either trapped on the wall before or after their desig...","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"3 1","pages":"21-34"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151698","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: 2
Experimental and Numerical Investigation of Forced Convection Heat Transfer in an Optimized Microchannel Heat Sink 优化微通道散热器强制对流换热的实验与数值研究
International journal of micro-nano scale transport Pub Date : 2012-06-01 DOI: 10.1260/1759-3093.3.1-2.69
V. Swami, D. Kamble, Dr. B. S. Gawali
{"title":"Experimental and Numerical Investigation of Forced Convection Heat Transfer in an Optimized Microchannel Heat Sink","authors":"V. Swami, D. Kamble, Dr. B. S. Gawali","doi":"10.1260/1759-3093.3.1-2.69","DOIUrl":"https://doi.org/10.1260/1759-3093.3.1-2.69","url":null,"abstract":"In this study, the experimental and numerical investigation of forced convective heat transfer in an optimized rectangular micro-channel heat sink (MCHS) is analyzed using water as the working fluid. The optimization of MCHS has carried out by using CVM (Constant Volume Method) and VVM (Variable Volume Method). From the optimization, it is clear that aspect ratio three which gives the better heat transfer coefficient and lower pressure drop values as comparing with adjacent aspect ratios. A numerical investigation of MCHS based on the finite volume method. The numerical results are validated by comparing the predictions with analytical solutions and experimental data. High heat flux and high coefficient of heat transfer obtained by reducing the core volume of the channel and changing operating conditions. The Optimized micro-channels geometry has a width of 700 μm and a depth of 2100 μm, and is separated by a 350 μm wall. The microchannels are made on cooper plate by using a wire Electro Discharge Machini...","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"3 1","pages":"69-78"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1260/1759-3093.3.1-2.69","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151776","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: 2
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