Heat transfer enhancement in oscillatory flow in channel with periodically upper and lower walls mounted obstacles

Korichi, Abdelkader; Oufer, Lounes

doi:10.1016/j.ijheatfluidflow.2006.11.002

Cited by 36 publications

(11 citation statements)

References 23 publications

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“…The following equations (11)(12)(13)(14)(15)(16)(17)(18) were employed to calculate the thermophysical properties of nanofluids: Effective Density (Maxwell, 1873):…”

Section: Thermophysical Properties Of Nanofluidsmentioning

confidence: 99%

“…They discussed the reason in the critical Reynolds number of bifurcation, which is almost half for grooves on both walls, since the instability of shear layer is twice compared to grooves on just lower wall. In a similar investigation, Korichi and Oufer (2006) numerically studied the Nusselt distribution in a channel with periodic ribs on both walls. They reported that up to 141% improvement in heat transfer was obtained for this geometry.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Turbulent Nanofluid Flow Over Periodic Rib-Grooved Channels

Vatani

Mohammed

2013

Engineering Applications of Computational Fluid Mechanics

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In this paper, the effects of using different rib-groove shapes of triangular, square and arc, different geometrical parameters and also different types of nanofluids including and on the thermal and hydraulic behavior of flow in a horizontal rib-grooved channel are numerically investigated. The finite volume method (FVM) is applied to solve the two dimensional governing and energy equations. Constant heat flux was imposed on the channel walls. The effects of nanoparticle diameter in the range of 30-70nm, nanoparticle volume concentration in the range of 1-4%, and also Reynolds numbers varying from 30,000 to 50,000 were examined in this study. The performance of rib-grooved channel was evaluated in terms of average Nusselt number, friction coefficient and performance index. The results revealed that rectangular rib-rectangular groove shows the best performance having the highest performance evaluation criterion (PEC). The results also indicated that using nanofluid flow in grooved channels could provide a significant increase in heat transfer and thermal performance with negligible increase in friction. The SiO2-water nanofluid provides highest Nusselt number among all types studied. It is also observed that increasing the nanoparticles volume fraction and Reynolds number enhanced the Nusselt number while increasing nanoparticles diameter decreased it.

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“…The following equations (11)(12)(13)(14)(15)(16)(17)(18) were employed to calculate the thermophysical properties of nanofluids: Effective Density (Maxwell, 1873):…”

Section: Thermophysical Properties Of Nanofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Turbulent Nanofluid Flow Over Periodic Rib-Grooved Channels

Vatani

Mohammed

2013

Engineering Applications of Computational Fluid Mechanics

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show abstract

“…Finally and in order to take in account the conjugate heat transfer, the treatment of the sudden changes of the thermophysical properties at the solid-fluid interface is handled by applying the domain extension method the details of which are presented in [29]. The code was already validated and used in previous works [30][31][32][33]. It is important to note that 300,000 time steps are needed to obtain fully developed time periodic flow at Re = 1000 which takes about 210 hours for Ds = 2 Â 10 À5 , on a PC with P4 processor.…”

Section: Numerical Solutionmentioning

confidence: 99%

Heat transfer enhancement in self-sustained oscillatory flow in a grooved channel with oblique plates

Korichi

Oufer

Polidori³

2009

International Journal of Heat and Mass Transfer

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“…Cheng [6] numerically studied the flow and heat transfer in a stacked two-layer micro channels with easy-processing passive microstructures and found that stacked micro channel has better thermal performance compared to simple one. Korichi and Oufer [7] studied the flow and thermal performance of a horizontal channel with obstacles mounted alternatingly on both upper and lower walls numerically. It was found that a travelling wave generated by the vortex shedding from the constriction and expansion contributes mainly to heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%