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International journal of micro-nano scale transport最新文献

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Streaming Potential in Narrow Fluidic Confinements - A Theoretical Perspective 窄流场的流势——一个理论视角
International journal of micro-nano scale transport Pub Date : 2014-09-01 DOI: 10.1260/1759-3093.5.3.109
Prakash Goswami, A. Bandopadhyay, S. Chakraborty
{"title":"Streaming Potential in Narrow Fluidic Confinements - A Theoretical Perspective","authors":"Prakash Goswami, A. Bandopadhyay, S. Chakraborty","doi":"10.1260/1759-3093.5.3.109","DOIUrl":"https://doi.org/10.1260/1759-3093.5.3.109","url":null,"abstract":"Streaming potential is one of the four major electrokinetic phenomena where the flow of aqueous electrolytes due to an applied axial pressure gradient causes the generation of an induced axial electric field. The field may be evaluated by considerations of a net zero current due to the absence of an applied axial electric field. We elaborate on the theoretical aspects of streaming potential from fundamental considerations of electrostatics and fluid mechanics. Later, we focus on an exciting and futuristic application of streaming potential, where the induced electric field is tapped to drive a current through an external resistor thereby allowing one to convert mechanical energy into electrical energy.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"5 1","pages":"109-130"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1260/1759-3093.5.3.109","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66152022","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
Effect of Slip Length on Entropy Generation of Fully Developed Forced Convection in a Micro-Channel for a Power Law Fluid 滑移长度对幂律流体微通道中完全展开强制对流熵产的影响
International journal of micro-nano scale transport Pub Date : 2013-09-01 DOI: 10.1260/1759-3093.4.3-4.117
V. Anand, H. Lakshmanan
{"title":"Effect of Slip Length on Entropy Generation of Fully Developed Forced Convection in a Micro-Channel for a Power Law Fluid","authors":"V. Anand, H. Lakshmanan","doi":"10.1260/1759-3093.4.3-4.117","DOIUrl":"https://doi.org/10.1260/1759-3093.4.3-4.117","url":null,"abstract":"In this paper, the effect of slip length on entropy generation of fluid flow in a microchannel is analyzed. The flow between the parallel plates is considered fully developed both hydrodynamically and thermally. Uniform heat flux boundary condition is assumed. The fluid is supposed to be non Newtonian, following a power law model. To model the slip, Navier's linear slip law has been used. The spatial distribution of fluid velocity, non dimensional temperature, non dimensional entropy generation and Bejan number has been investigated for different slip length ratios. For dilatants fluids, it is found that that the effect of slip length is significant and cannot be neglected.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"4 1","pages":"117-132"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1260/1759-3093.4.3-4.117","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151539","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
Thermal characteristics of streaming potential mediated flows of non-newtonian fluids with asymmetric boundary conditions and steric effect 非对称边界条件和位阻效应下流势介导非牛顿流体流动的热特性
International journal of micro-nano scale transport Pub Date : 2013-09-01 DOI: 10.1260/1759-3093.4.3-4.147
R. Agarwal, Nikhil Desai, Jeevanjyoti Chakraborty, R. Dey, S. Chakraborty
{"title":"Thermal characteristics of streaming potential mediated flows of non-newtonian fluids with asymmetric boundary conditions and steric effect","authors":"R. Agarwal, Nikhil Desai, Jeevanjyoti Chakraborty, R. Dey, S. Chakraborty","doi":"10.1260/1759-3093.4.3-4.147","DOIUrl":"https://doi.org/10.1260/1759-3093.4.3-4.147","url":null,"abstract":"Electrokinetic flows through narrow confinements have mostly been studied with symmetric boundary conditions on the walls even though in practice it is very common to have these walls made of different materials which in turn lead to different surface charge conditions on them. Such a dearth of studies is particularly acute in streaming potential flows which are naturally predisposed to strongly influence even simple pressure-driven flows in such narrow confinements. Further, the very nature of the fluid may, in general cases, be of non-Newtonian nature; this is especially true for biomedical assays. Motivated by this, we address a model problem of a streaming potential mediated flow of a power-law fluid through a slit channel having different boundary conditions. Additionally, as an important new contribution to this line of investigation, we study the thermal characteristics of such flow. Noting, pertinently, that the streaming potential effects are especially stronger for high values of the surface cha...","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"4 1","pages":"147-158"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1260/1759-3093.4.3-4.147","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151559","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
Modelling of Electrostatics in Nanofluidic Channels 纳米流体通道中的静电建模
International journal of micro-nano scale transport Pub Date : 2013-09-01 DOI: 10.1260/1759-3093.4.3-4.133
Pankaj Asija, S. Datta
{"title":"Modelling of Electrostatics in Nanofluidic Channels","authors":"Pankaj Asija, S. Datta","doi":"10.1260/1759-3093.4.3-4.133","DOIUrl":"https://doi.org/10.1260/1759-3093.4.3-4.133","url":null,"abstract":"The equilibrium interaction between the processes of charge formation on the surface of a nanochannel and ionic distribution within the confined electrolyte is studied for situations where electric-double-layer (EDL) are of size comparable to the nanochannel cross-dimension and the mean-field surface electrostatic potential is comparable to or larger than the thermal energy per unit charge of an ion. The effects of channel size, pH, ionic composition and the compact region of the electric double layer are investigated. The results can be used for understanding electrokinetic phenomena involving current conduction and fluid flow in nanochannels, as demonstrated through a comparison of the theoretical results with measured electrical conductance data.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"4 1","pages":"133-146"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151550","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
Thermal Conductivity and Thermal Interface Resistance Measurements of Thin Films using 3ω Method 用3ω法测量薄膜的热导率和热界面电阻
International journal of micro-nano scale transport Pub Date : 2013-09-01 DOI: 10.1260/1759-3093.4.3-4.85
Samskar Kuthati, A. Pattamatta
{"title":"Thermal Conductivity and Thermal Interface Resistance Measurements of Thin Films using 3ω Method","authors":"Samskar Kuthati, A. Pattamatta","doi":"10.1260/1759-3093.4.3-4.85","DOIUrl":"https://doi.org/10.1260/1759-3093.4.3-4.85","url":null,"abstract":"A large number of experimental and theoretical studies investigating thermal conductivity of both bulk and thin films exist in the literature. For measurement of thermal conductivity of bulk films we have methods like Guarded Hot Plate method, Flash method and for thin films we have methods like Thermo reflectance and Photo acoustic methods. What makes 3ω method different from other methods is that it can be used over a wide range of film thicknesses ranging from nano scale to milli meters. The purpose of the present study is to validate the method and measure thermal conductivity and thermal interface resistance of thin films of varying thickness. In the present study, we have measured thermal conductivity of thin films of SiO2 of varying thickness deposited on Si substrate and thermal interface resistance of their interfaces. Initially all the required thin films of different thickness were fabricated using different techniques. Firstly, experiments were conducted on a bulk borofloat glass to validate t...","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"4 1","pages":"85-106"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151616","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
A Molecular Dynamics Study of Energy and Momentum Accommodation Coefficients in the Transitional Knudsen Numbers 过渡Knudsen数中能量和动量调节系数的分子动力学研究
International journal of micro-nano scale transport Pub Date : 2013-09-01 DOI: 10.1260/1759-3093.4.3-4.107
Sooraj K. Prabha, Sarith P. Sathian
{"title":"A Molecular Dynamics Study of Energy and Momentum Accommodation Coefficients in the Transitional Knudsen Numbers","authors":"Sooraj K. Prabha, Sarith P. Sathian","doi":"10.1260/1759-3093.4.3-4.107","DOIUrl":"https://doi.org/10.1260/1759-3093.4.3-4.107","url":null,"abstract":"The principal aim of this work is to study the thermophysical aspects of gas interaction on the walls of nano-channels using a three dimensional Molecular Dynamics (MD) model. The complete physics of gas-surface interaction in micro/nano channels in the non continuum regime is yet to be understood. The important parameters that are relevant to such interactions include energy and momentum accommodation coefficients. The study reported in this paper aims at implementing a relatively simple methodology for calculating different accommodation coefficients. Energy accommodation coefficient (EAC) and normal momentum accommodation coefficient (NMAC) are the main focus of the study. The accommodation coefficients for the different equilibrium states are calculated. Instead of tracking individual collision, a collection of collisions are considered for the calculations. The EAC and NMAC reported here are found to be influenced by gas-wall temperature difference and Knudsen number in the transition regime.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"4 1","pages":"107-116"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151505","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
Effect of Confined Fluid Interaction on the Thermal Transport in Carbon Nanotubes 约束流体相互作用对碳纳米管热传递的影响
International journal of micro-nano scale transport Pub Date : 2013-09-01 DOI: 10.1260/1759-3093.4.3-4.77
T. Krishnan, J. S. Babu, Sarith P. Sathian
{"title":"Effect of Confined Fluid Interaction on the Thermal Transport in Carbon Nanotubes","authors":"T. Krishnan, J. S. Babu, Sarith P. Sathian","doi":"10.1260/1759-3093.4.3-4.77","DOIUrl":"https://doi.org/10.1260/1759-3093.4.3-4.77","url":null,"abstract":"Carbon nanotubes (CNTs) are one of the most commonly used engineering materials. The axial thermal conductivity of CNTs were found to be exceptionally high, which makes them one of the favourable candidates for the next generation thermal management devices. Previous works have indicated that the presence of confined fluid molecules inside the CNT lead to a reduction in the thermal conductivity of the CNT. In the present study, we investigate the effect of confined liquid flow through CNTs on the thermal transport of CNTs. Spectral energy density method is used to predict the phonon properties and lifetimes of the CNT. The phonon mode lifetimes were found to be greater under flow compared to filled condition for smaller diameter CNTs. But the flow does not seem to modify signifcantly the phonon mode lifetimes of larger diameter CNTs. These variations in the thermal transport properties of CNT is explained using the changes occuring in the physical behavior of the confined fluid as the tube diameter changes.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"4 1","pages":"77-84"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1260/1759-3093.4.3-4.77","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151605","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
An approach to manufacture a heterobipolar transistors in thin film structures. On the method of optimization 一种在薄膜结构中制造异质双极晶体管的方法。论最优化的方法
International journal of micro-nano scale transport Pub Date : 2013-03-01 DOI: 10.1260/1759-3093.4.1-2.17
E. Pankratov, E. Bulaeva
{"title":"An approach to manufacture a heterobipolar transistors in thin film structures. On the method of optimization","authors":"E. Pankratov, E. Bulaeva","doi":"10.1260/1759-3093.4.1-2.17","DOIUrl":"https://doi.org/10.1260/1759-3093.4.1-2.17","url":null,"abstract":"In this paper we introduce an approach to manufacture more thin heterobipolar transistors due to diffusion and/or implantation of ion of dopants in heterostructure with introduced in this paper configuration and optimization of annealing of dopant and/or radiation defects. At the same time we introduce an analytical approach to model technological processes.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"36 1","pages":"17-32"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151927","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: 27
Linear Instability Analysis of the jetting regime for Co-flowing immiscible liquids in co-axial microtubes 同轴微管中共流非混相液体射流流态的线性不稳定性分析
International journal of micro-nano scale transport Pub Date : 2013-03-01 DOI: 10.1260/1759-3093.4.1-2.51
I. Yang, M. El-Genk
{"title":"Linear Instability Analysis of the jetting regime for Co-flowing immiscible liquids in co-axial microtubes","authors":"I. Yang, M. El-Genk","doi":"10.1260/1759-3093.4.1-2.51","DOIUrl":"https://doi.org/10.1260/1759-3093.4.1-2.51","url":null,"abstract":"This paper applies the linear instability analysis to the prediction of the boundary between transition and jetting regimes for forming disperse droplets using co-flowing immiscible liquid in coaxial microtubes. Results are compared to a flow regimes map developed based on numerical simulations covering wide range of parameters and liquids properties. The results are also compared to reported experimental measurements for co-flowing ionized water and PDMS oil in coaxial microtubes. Although captures the general trend, the linear instability analysis consistently under predicts and over predict the boundary between transition and jetting at low and high Cad, respectively. This is because the analysis neglects the secondary perturbations and the inertia of the disperse liquid. Nonetheless, the linear instability analysis is a nearly accurate predicative approach that is much faster than performing Computation Fluid Dynamic (CFD) simulations or conducting experiments.","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"4 1","pages":"51-76"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151945","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
Entropy Generation in Electro-Osmotic Flow in Microchannels 微通道中电渗透流的熵生成
International journal of micro-nano scale transport Pub Date : 2013-03-01 DOI: 10.1260/1759-3093.4.1-2.1
R. Gorla
{"title":"Entropy Generation in Electro-Osmotic Flow in Microchannels","authors":"R. Gorla","doi":"10.1260/1759-3093.4.1-2.1","DOIUrl":"https://doi.org/10.1260/1759-3093.4.1-2.1","url":null,"abstract":"An analysis has been provided for the entropy generation in thermally fully developed electro-osmotically generated flow in a parallel plate microchannel in terms of Brinkman number, Peclet number, dimensionless joule heating parameter, dimensionless viscous heating parameter as well as physical properties of the fluid under imposed constant wall heat flux boundary condition. Such a flow is established not by an imposed pressure gradient, but by a voltage potential gradient along the length of the tube. The solution for momentum and energy equations is used to get the exact solution for the dimensionless entropy generation number. This analysis assumes no pressure-driven component to the velocity field and constant fluid properties. Different variables namely, dimensionless joule heating parameter, viscous heating parameter, Peclet number and Brinkman number have been identified from the dimensionless entropy generation number equation. Various results for dimensionless entropy generation number, Bejan nu...","PeriodicalId":89942,"journal":{"name":"International journal of micro-nano scale transport","volume":"4 1","pages":"1-16"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1260/1759-3093.4.1-2.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66151890","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
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