Numerical Analysis of Gas Flow in Microchannels

Chen, C. S.; Lee, S. M.; Sheu, Jyh-Cherng

doi:10.1080/10407789808913964

Cited by 68 publications

(52 citation statements)

References 5 publications

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“…The first-order slip/jump boundary conditions utilized in this model have predicted subsonic gas flow through microgeometries 19,20 and benchmarked both experimental 22 and numerical 23 results for microchannels and nanopores. 20 As a complement to our recent publications, 19−21 this paper aims to explore the applicability of hydrodynamic model to investigate heat-transfer characteristics of high-speed compressible flows through microchannels having inlet Knudsen numbers of 0.062 and 0.14.…”

Section: −21mentioning

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: −21mentioning

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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“…Their work also documented that optimum channel depth exists for various Reynolds number. Experimental and numerical techniques has been utilised to further investigate and maximize the cooling abilities of micro-channel heat sinks in recent researches [12][13][14][15][16][17][18]. In this work, an optimal geometry for a micro-channel heat sink is numerically determined which minimizes the peak wall temperature using mathematical optimization and constructal design theory.…”

Section: Numerical Optimization For Design Of Micro-channelmentioning

confidence: 99%

Combined Numerical Optimization and Constructal Theory for the Design of Microchannel Heat Sinks

Bello‐Ochende

Meyer

Ighalo

2010

Numerical Heat Transfer, Part A: Applications

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“…Gaseous steady flows in long microducts have been numerically [5][6][7][8][9][10][11], analytically, and experimentally [2,[12][13][14][15][16][17][18][19][20][21][22][23][24][25] studied by several authors. In microducts, the Knudsen number…”

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confidence: 99%