Gas Transport Characteristics through a Carbon Nanotubule

Cooper, Sarah M.; Cruden, Brett A.; Meyyappan, M.; Raju, Reni; Roy, Subrata

doi:10.1021/nl0350682

Cited by 87 publications

(55 citation statements)

References 20 publications

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“…28 Further size reduction of the transport carrier can result in incorrect modeling of the shear stress and nonequilibrium processes. In such a case one can significantly alter predicted flow properties by controlling the nature of the pore surfaces 21 and possibly by modifying the bulk viscosity and adding the quantum effect.…”

Section: Discussionmentioning

confidence: 99%

Hydrodynamic Study of High Speed Flow and Heat Transfer Through a Microchannel

Raju

Roy

2005

Journal of Thermophysics and Heat Transfer

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Fluid flow and heat-transfer characteristics in microchannels are investigated using a finite element based hydrodynamic model with first-order slip/jump boundary conditions. Helium and nitrogen are utilized as working fluid, and the Knudsen-number ranges from slip to transition regime. Results for high-speed compressible gas flow for two separate cases for a microchannel with rough surface and an aspect ratio of five have been compared with published direct-simulation Monte Carlo results. Despite some noticeable differences, the hydrodynamic model compares favorably in predicting the flow structure and heat-transfer characteristics for high-speed microflows. NomenclatureC p = specific heat at constant pressure H = height of the channel Kn = Knudsen number k = thermal conductivity L = length of the channel Ma = Mach number P = gas pressure Pr = Prandtl number R = reduced gas constant T = temperature t = time u = gas velocity in x direction v = gas velocity in y direction γ = specific heat ratio = reference length λ = mean free path of the fluid µ = coefficient of viscosity ρ = gas density σ T = thermal-momentum coefficient σ v = tangential-momentum coefficient Subscripts g = gas properties w = wall properties 0 = reference quantity

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Section: Discussionmentioning

confidence: 99%

Hydrodynamic Study of High Speed Flow and Heat Transfer Through a Microchannel

Raju

Roy

2005

Journal of Thermophysics and Heat Transfer

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“…As several recent studies have shown low accommodation coefficients to be practically realisable -e.g. σ U values as low as 0.52, arguably, for carbon nanotubes [27] -different accommodation coefficients, and the accuracy with which they are determined in experimental cases, are likely to have an important effect on many types of continuum models for rarefied gas flow. Also of interest is the interaction between the two types of accommodation coefficient.…”

Section: Discussionmentioning

confidence: 99%

Evaluating constitutive scaling models for application to compressible microflows

O’Hare

Scanlon

Emerson

et al. 2008

International Journal of Heat and Mass Transfer

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We demonstrate here, for the first time, the constitutive scaling approach applied to simulate a fully compressible, non-isothermal micro gas flow within a mainstream computational physics framework. First, the physics underlying these new constitutive-relation scaling models for rarefied gas flows at the microscale, in particular, the Knudsen layer, is discussed. Results for Couette-type flows in microchannels, including heat transfer effects due to rarefaction, are then reported and we show comparisons with both traditional Navier-Stokes-Fourier solutions and independent numerical studies. We discuss the limitations of the constitutive scaling process, such as the breakdown of the model as the Knudsen number increases and the influence of the wall interaction model on the numerical results. Advantages of the constitutive scaling technique are described, with particular reference to the practicality of using it for microscale engineering design.

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“…The code is modular and has been used to solve a range of problems involving collisional plasmas 15,16,19,21,22 and micro/nanoscale flows. [23][24][25] Briefly, the variational integral using any admissible test function w yields the weak statement for the governing continuity, momentum and energy equations. Thereafter, the domain Ω and integrated variables are spatially discretised to Ω e and solution variables are locally interpolated using Lagrange basis functions.…”

Section: Methodsmentioning

confidence: 99%

Self-consistent Electrode Model for Magnetoplasmadynamic Thrusters

Roy

2004

40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit

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Accurate sheath modeling is of considerable interest to the effective design of ionized flow in several aerospace applications including space propulsion thrusters and high-speed air vehicles. In particular, an electrode sheath (fall) voltage model is necessary to predict the power requirement, which in turn is used to measure the total efficiency for on-board propulsion thrusters. Plasma wall interaction is thus crucial for improving the high power thruster efficiency. In this paper, a finite element discretized two-dimensional self-consistent formulation of plasma-sheath dynamics, using multi-fluid equations for partially ionized plasma, is presented. The formulation is applied to a simplistic electrode model. Computed potential distributions on three locations along the electrode are plotted. The details of the number densities of electrons, ions and neutrals along with ion, electron and neutral dynamics, sheath potential and electron temperature profiles gives insight into the wall potential loss mechanism.

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Gas Transport Characteristics through a Carbon Nanotubule

Cited by 87 publications

References 20 publications

Hydrodynamic Study of High Speed Flow and Heat Transfer Through a Microchannel

Hydrodynamic Study of High Speed Flow and Heat Transfer Through a Microchannel

Evaluating constitutive scaling models for application to compressible microflows

Self-consistent Electrode Model for Magnetoplasmadynamic Thrusters

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