Heat transfer in rectangular microchannels

Tunc, Gokturk; Bayazıtoğlu, Yıldız

doi:10.1016/s0017-9310(01)00201-0

Cited by 164 publications

(71 citation statements)

References 8 publications

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“…As a sample of the results, Fig. 2 compares our fRe and β with those of (Morini et al 2004) and (Tunc and Bayazitoglu 2002) for microducts without a porous insert, i.e. when s=0 and a=1.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, similar to Tunc and Bayazitoglu (Tunc and Bayazitoglu 2002), the slip coefficient, β, is obtainable as…”

Section: Discussionmentioning

confidence: 97%

“…Slip flow in various-shaped microchannels has been studied extensively in the past decades (Morini, Spiga and Tartarini 2004, Sparrow and Hajisheikh 1964, Tunc and Bayazitoglu 2002, Zhu, Liao and Xin 2006, Yu and Ameel 2001, Hooman 2007, to name a few. However, theoretical research on slip flow in porous-saturated microducts of arbitrary cross-section has not been conducted as much as those on clear fluid counterparts.…”

Section: Introductionmentioning

confidence: 99%

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Slip flow forced convection in a microporous duct of rectangular cross-section

Hooman

2009

Applied Thermal Engineering

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Applying a Fourier series approach, closed form solutions for fully developed velocity and temperature distribution in a porous-saturated microduct of rectangular cross-section are presented in the slip-flow regime. The Brinkman flow model is applied. Invoking the temperature jump equation, the H1 thermal boundary condition is investigated. Expressions are presented for the local and average velocity and temperature profiles, the friction factor, and the slip coefficient in terms of the key parameters. The present results, which are applicable to microducts of rectangular cross-section filled with or without a porous medium, are found to be in complete agreement with those available in the literature for both no-slip and slip flow regime.

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“…As a sample of the results, Fig. 2 compares our fRe and β with those of (Morini et al 2004) and (Tunc and Bayazitoglu 2002) for microducts without a porous insert, i.e. when s=0 and a=1.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, similar to Tunc and Bayazitoglu (Tunc and Bayazitoglu 2002), the slip coefficient, β, is obtainable as…”

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Slip flow forced convection in a microporous duct of rectangular cross-section

Hooman

2009

Applied Thermal Engineering

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“…The thermally developing cases have been studied by Jeong (2006a, 2006b) by taking the effects of viscous dissipation and streamwise conduction into account. Fully developed laminar slip flow forced convection in a rectangular microchannel was studied by Tunc and Bayazitoglu (2002), using integral transform method. The thermally developing case has been studied by Yu and Ameel (2001) by applying a modified generalized integral transform technique to solve the energy equation, assuming hydrodynamically fully developed flow.…”

Section: Fig 3 Transverse Distribution Of Dimensionless Velocity Atmentioning

confidence: 99%

Heat Transfer at Microscale

Saidi¹,

Sadeghi²

2011

Heat Transfer - Mathematical Modelling, Numerical Methods and Information Technology

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“…For example Tunc and Bayazitoglu [25] used the H2 boundary condition while Lee and Garimella [26] suggested that H1 thermal boundary condition represents micro-channel heat sinks best. It is anticipated that the thermal boundary condition will fall between H1 and H2.…”

Section: Introductionmentioning

confidence: 99%

Characterising micro-channel absorber plates for building integrated solar thermal collectors

Oyinlola

Shire

2018

Building Services Engineering Research and Technology

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Abstract.This paper discusses the characterisation of micro-channel absorber plates for Compact Flat Plate solar thermal collectors. Experimental and computational studies were carried out at typical operating conditions for flat plate solar collectors; overall heat loss coefficient in the range 2 -8 W/m 2 .°C, flow rate in the range 0.01 -0.1 kg/s/m 2 and heat transfer coefficients in the range 100 -1000 W/m 2 .°C. Three Dimensional numerical analysis using commercial CFD package, Ansys CFX, showed that heat transfer occurred on only three surfaces of the channel and there was a peripheral variation of the heat flux density. It was also observed that axial thermal conduction could modify the surface boundary at the inlet and outlet, however, the middle section of the channel could be approximated as a rectangular channel with three walls transferring heat under a H1 boundary condition. Experimental studies were used to estimate the standard parameters (channel efficiency, F, collector efficiency factor, F', heat removal factor, FR, and flow factor F") for predicting performance of the flat plate collectors. An alternate parameter, channel efficiency, F, was proposed to replace Fin efficiency, F, used in standard collector analysis. The results showed that values of F and F', very close to unity could be achieved with this design when the overall heat loss coefficient is below 2 W/m 2 .°C. The analysis further revealed that increasing the fluid-plate heat transfer coefficient beyond 300 W/m 2 .°C has marginal effect on the collector efficiency factor at a given UL value. The collector flow factor F" and the heat removal factor could be improved by increasing the collector capacitance rate; this can be achieved by increasing the mass flow rate per collector area ̇/ , as well as reducing the overall heat loss, UL . This analysis is important for optimizing design and operating parameters, especially to minimize temperature gradient in the transverse and longitudinal directions.

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Heat transfer in rectangular microchannels

Cited by 164 publications

References 8 publications

Slip flow forced convection in a microporous duct of rectangular cross-section

Slip flow forced convection in a microporous duct of rectangular cross-section

Heat Transfer at Microscale

Characterising micro-channel absorber plates for building integrated solar thermal collectors

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