Influence of wall roughness models on fluid flow and heat transfer in microchannels

Guo, Lin; Xu, Huijin; Gong, Liang

doi:10.1016/j.applthermaleng.2015.04.001

Cited by 72 publications

(21 citation statements)

References 26 publications

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“…The axial heat transfer, surface roughness, viscous heating are also negligible. Wavy channel [9][10][11][12], branched channel [13][14][15], ribs, fins or rough elements [16][17][18][19] (such as triangular, rectangular, dimple elements and so on) have also been investigated, the rough elements method can strengthen the convection heat transfer without large pressure penalty and is a possible low-cost solution.…”

Section: Introductionmentioning

confidence: 99%

Parametric numerical study of the flow and heat transfer in microchannel with dimples

Gong

et al. 2016

International Communications in Heat and Mass Transfer

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The characteristics of flow and heat transfer in microchannel with dimples were numerically investigated. The geometric parameters of dimpled channel, including aspect ratio, dimple depth and dimple spacing, were independently studied under constant Reynolds number 500. A constant heat flux 1W/mm 2 was adopted in the central area at the bottom of the microchannel heat sink to simulate a high power device. In comparison to straight channels, dimpled surface reduced the local flow resistance and also improved thermal performance of micro-channel heat sink. Compared to flat channel case, the optimal dimpled case have 3.2K decrease of temperature, 15% gain of Nusselt number and 2% reduce of pressure drop.

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Section: Introductionmentioning

confidence: 99%

Parametric numerical study of the flow and heat transfer in microchannel with dimples

Gong

et al. 2016

International Communications in Heat and Mass Transfer

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“…Based on the platform, several assumptions given below were taken to make the mathematical models more reasonable and simpler [16]. The steady-state conservation equations for mass, momentum and energy in fluid are given by:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…As a result, a significant increase in Poiseuille number was detected for all the configurations considered, while the effect of roughness on the average Nusselt number was smaller and highly dependent on the tube shape. Guo et al [16] proposed a novel and effective rough surface model, namely the Gauss model, to disclose the fluid flowing and thermal performance in microchannels with roughness. The results obviously showed that both the Poiseuille number and average Nusselt number of all the models increased with the growing of average roughness.…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer characteristics of leaf-vein-inspired microchannels with wall thickening patterns

Luo

Liu

Wang

et al. 2016

International Journal of Heat and Mass Transfer

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“…They proposed a theoretical model for apparent friction factor and the model was validated with their experimental data and results available in the literature. Guo et al (2015) numerically analyzed the influence of wall roughness models on fluid flow and heat transfer in microchannels and proposed more efficient and convenient 3D Gauss model to describe fluid flow and thermal performance. The results proved that roughness has a positive effect on friction factor even in the laminar flow region.…”

Section: Introductionmentioning

confidence: 99%

“…The assumptions used for the analysis are (1) steady, laminar, incompressible flow, (2) constant physical properties and (3) no-slip condition at the wall. The numerical study of Guo et al (2015) reveals that noslip velocity condition is a reasonable assumption for modeling fluid flow over the structured rough surface.…”

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confidence: 98%

Modeling Frictional Characteristics of Water Flowing Through Microchannel

Jayadevan

Siddharth²,

Kamath

2019

JAFM

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The present study aims at modeling the real random rough surface of a microchannel with structured rough channel of known geometric parameters. The surface of the microchannel is created by sinusoidal function using MATLAB code and 2D simulation of the model is carried out with commercial software ANSYS Fluent. The height of the channel is varied from 100 to 250 µm and length of the channel is 12.5 mm. The range of Reynolds number selected for analysis is 100 to 500 with water as the fluid medium. The roughness height is selected within the range of actual manufacturing roughness level of microchannels. The results show that channel geometry has significant influence on flow characteristics. A new non-dimensional roughness parameter β, is proposed to represent the dependence of friction factor on geometric parameters in the laminar region. A correlation for flow friction is developed as a function of roughness parameter and Reynolds number.

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Influence of wall roughness models on fluid flow and heat transfer in microchannels

Cited by 72 publications

References 26 publications

Parametric numerical study of the flow and heat transfer in microchannel with dimples

Parametric numerical study of the flow and heat transfer in microchannel with dimples

Heat and mass transfer characteristics of leaf-vein-inspired microchannels with wall thickening patterns

Modeling Frictional Characteristics of Water Flowing Through Microchannel

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