Numerical simulation of wall roughness on gaseous flow and heat transfer in a microchannel

Ji, Yan; Yuan, Kun; Chung, J. N.

doi:10.1016/j.ijheatmasstransfer.2005.10.011

Cited by 103 publications

(50 citation statements)

References 20 publications

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“…Ji et al [51] numerically analysed the rarefaction, compressibility and surface roughness effects for a 2D pressure-driven gas flow between two long parallel plates, with uniform temperature, in the slip flow regime. The roughness was modelled by uniformly and symmetrically distributed rectangular blocks on the top and bottom surfaces of the channel.…”

Section: Surface Roughness Effectsmentioning

confidence: 99%

Single-phase heat transfer in microchannels: The importance of scaling effects

Rosa

Karayiannis

Collins

2009

Applied Thermal Engineering

249

117

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Microscale single-phase heat transfer is widely used in industrial and scientific applications and for this reason, many related papers have been published in the last two decades. Nevertheless, inconsistencies between published results still exist and there is no generally accepted model for the prediction of singlephase heat transfer in microchannels. This paper presents a review of the experimental and numerical results available in the open literature. Heat transfer in microchannels can be suitably described by standard theory and correlations, but scaling effects (entrance effects, conjugate heat transfer, viscous heating, electric double layer (EDL) effects, temperature dependent properties, surface roughness, rarefaction and compressibility effects), often negligible in macro-channels, may now have a significant influence and have to be accounted for. Furthermore, measurement uncertainties may be more important, due to the reduced characteristic dimensions, so have to be accurately checked and, where possible, reduced. Experiments with single channels are more accurate and in good agreement with predictions from published correlations, in contrast to multi-(parallel) channel experiments. The latter are subject to maldistribution, 3D conjugate heat transfer effects and larger measurement uncertainties. Sub-continuum mathematical models for fluid dynamics are briefly reviewed and explained. These models are expected to gain a growing interest in the near future due to the rapid descent of microchannel dimensions down to the nano-scale. The paper concludes with a concise set of recommendations for purposes of performance and design. For single channels, available correlations for macro-channels can also give reliable predictions at the micro-scale, but only if all the scaling effects can be considered negligible. Otherwise, when scaling effects cannot be neglected or for the case of heat exchangers with parallel channels, suitable numerical simulations may be the sole alternative to carefully designed experiments to evaluate the heat transfer rates. KeywordsMicrochannels, scaling effects, measurement uncertainties, sub-continuum effects.

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Section: Surface Roughness Effectsmentioning

confidence: 99%

Single-phase heat transfer in microchannels: The importance of scaling effects

Rosa

Karayiannis

Collins

2009

Applied Thermal Engineering

249

117

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“…Futhermore, the interaction with compressibility effect is generally not taken into account. Only recently have Ji et al [13] considered simultaneously roughness, compressibility, and rarefaction, analyzing rectangular ribs in a plane channel up to a maximum exit Mach number around 0.5. Different cases were considered, designed to emphasize the role of either compressibility or rarefaction.…”

Section: Introductionmentioning

confidence: 99%

Compressibility and Rarefaction Effects on Pressure Drop in Rough Microchannels

Croce

D’Agaro

Filippo

2007

Heat Transfer Engineering

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“…The authors usually considered either a constant heat flux boundary condition or an isothermal condition to analyze the heat transfer characteristics of gaseous flows in various geometries such as: parallel plate microchannels and micropipe. In addition to the effect of rarefaction [10][11][12][13][14], various issues such as: viscous dissipation [15][16][17][18][19][20], axial conduction [21,22], thermal creep [23,24], compressibility [25][26][27][28], shear work [29][30][31], roughness [32,33], fluid property variation [34,35], and thermal boundary conditions affect the heat transfer characteristics of gaseous flows in microdevices. However, it is observed that viscous dissipation acts as an internal heat source in the fluid and significantly affects the temperature field and subsequently the Nusselt Number.…”

Section: Introductionmentioning

confidence: 99%

“…The shear work is found to play a significant role at solid boundaries in small-scale gaseous flows especially when the slip effect is present [29][30][31]. Studies have been reported that consider the role of surface roughness on heat transfer performance [32,33]. It is observed that roughness affects the pressure drop significantly, while it weakly affects the Nusselt number.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Convective Heat Transfer in Parallel Plate Microchannel with Viscous Dissipation and Constant Heat Flux Boundary Conditions

Kushwaha

Sahu

2016

J. Inst. Eng. India Ser. C

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This paper reports the hydrodynamically and thermally fully developed, laminar, incompressible, forced convective heat transfer characteristics of gaseous flows through a parallel plate microchannel with different constant heat flux boundary conditions. The first order velocity slip and viscous dissipation effects are considered in the analysis. Here, three different thermal boundary conditions such as: both plates kept at different constant heat fluxes, both plates kept at equal constant heat fluxes and one plate kept at constant heat flux and other one insulated are considered for the analysis. The deviation in Nusselt number between the model that considers both first order velocity slip and temperature jump and the one that considers only velocity slip is reported. Also, the effect of various heat flux ratios on the Nusselt number is reported in this analysis. In addition, the deviation in Nusselt number between first and second order slip model is discussed in this study.

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Numerical simulation of wall roughness on gaseous flow and heat transfer in a microchannel

Cited by 103 publications

References 20 publications

Single-phase heat transfer in microchannels: The importance of scaling effects

Single-phase heat transfer in microchannels: The importance of scaling effects

Compressibility and Rarefaction Effects on Pressure Drop in Rough Microchannels

Comprehensive Analysis of Convective Heat Transfer in Parallel Plate Microchannel with Viscous Dissipation and Constant Heat Flux Boundary Conditions

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