Slip-flow and heat transfer in rectangular microchannels with constant wall temperature

Renksizbulut, Metin; Niazmand, Hamid; Tercan, G.

doi:10.1016/j.ijthermalsci.2005.12.008

Cited by 144 publications

(79 citation statements)

References 34 publications

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“…Then, we calculated the velocity profile and compared with the published results. Figure 2 is the velocity profiles with slip boundary condition and no-slip boundary condition, it is found that the numerical results are good agreement with that in Reference of Renksizbulut (2006). This can verify the validation of present model and procedure.…”

Section: Model Validationsupporting

confidence: 81%

Effects of wall slip and nanoparticles' thermophoresis on the convective heat transfer enhancement of nanofluid in a microchannel

Wang

Zhu

2016

JTST

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Heat transfer enhancement with nanofluid appears to be an attractive work in recent years. In present work, a numerical formulation based on the Buongiorno model for convective heat transfer using Al2O3-water nanofluid accounted for the effects of Brownian motions and thermophoresis of nanoparticles, slip velocity and jump temperature at solid-fluid interface. Numerical investigations for laminar forced convection flows in a rectangle channel subjected to a uniform wall heat flux have been conducted. The numerical results show us that, the slip velocity can augment the heat transfer enhancement significantly due to the increase of the convection near the solid-fluid interface. Inversely, the jump temperature is not beneficial to the convective heat transfer because of the increased thermal resistance. The thermophoresis of particles affects heat transfer enhancement by changing local density, local viscosity, and local thermal conductivity. The thermophoresis of particles influences the skin friction coefficient also. The Nusselt number increases with the Reynolds number and particle volume fraction. The impact on the Nusselt number of Reynolds number will be receded in some extent because the thermophoresis velocity will be greater when the Reynolds number increasing. These numerical results help us to design micro-devices and understand the mechanism of heat transfer enhancement by adding nanoparticles in a microchannel.

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Section: Model Validationsupporting

confidence: 81%

Effects of wall slip and nanoparticles' thermophoresis on the convective heat transfer enhancement of nanofluid in a microchannel

Wang

Zhu

2016

JTST

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“…According to Ghoddoosi and Egrican (Ghodoossi and Egrican 2005), who studied microchannel heat transfer under slip flow and H1 boundary condition, this can happen when 0.001<Kn<0.1 while the flow is called slip flow. On the other hand, it is known that for the above range of Kn results obtained based on continuum assumptions match experimental counterpart provided that corrections in terms of the slip velocity and temperature jump be applied (Renksizbulut, Niazmand and Tercan 2006).…”

Section: Introductionmentioning

confidence: 86%

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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“…The convective heat-transfer coefficient h between the gas flows in the gas channel and GDL or separator wall is obtained from the study on heat-transfer in rectangular micro-channels [19]. The mass flow rates of the consumed gas and generated water in the gas channel, and the physical properties of the mixture gas were used for calculating the Re and h. The relationship among the Nu, aspect ratio of gas channel and Knudsen number for some Re values has been reported [19].…”

Section: Heat-balance Equations For Calculating Temperature Of Reactimentioning

confidence: 99%

“…The mass flow rates of the consumed gas and generated water in the gas channel, and the physical properties of the mixture gas were used for calculating the Re and h. The relationship among the Nu, aspect ratio of gas channel and Knudsen number for some Re values has been reported [19]. Although the Re is changed along the gas channel from the inlet to the outlet as well as with operation conditions, the Re was assumed to be 10 under all operation conditions investigated in this study.…”

Section: Heat-balance Equations For Calculating Temperature Of Reactimentioning

confidence: 99%

See 1 more Smart Citation

Temperature Distributions in Single Cell of Polymer Electrolyte Fuel Cell Simulated by an 1D Multi-plate Heat-Transfer Model and a 3D Numerical Simulation Model

Nishimura¹,

Baba²,

Osada³

et al. 2015

JEPE

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Abstract:The purpose of this study is to verify an 1D multi-plate heat-transfer model estimating the temperature distribution on the interface between polymer electrolyte membrane and catalyst layer at cathode in single cell of polymer electrolyte fuel cell, which is named as reaction surface in this study, with a 3D numerical simulation model solving many governing equations on the coupling phenomena in the cell. The results from both models/simulations agreed well. The effects of initial operation temperature, flow rate, and relative humidity of supply gas on temperature distribution on the reaction surface were also investigated. It was found in both 1D and 3D simulations that, the temperature rise (i.e., T react -T ini ) of the reaction surface from initial operation temperature at 70 °C was higher than that at 80 °C irrespective of flow rate of supply gas. The effect of relative humidity of supply gas on T react -T ini near the inlet of the cell was small. Compared to the previous studies conducted under the similar operation conditions, the T react -T ini calculated by 1D multi-plate heat-transfer model in this study as well as numerical simulation using 3D model was reasonable.

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Slip-flow and heat transfer in rectangular microchannels with constant wall temperature

Cited by 144 publications

References 34 publications

Effects of wall slip and nanoparticles' thermophoresis on the convective heat transfer enhancement of nanofluid in a microchannel

Effects of wall slip and nanoparticles' thermophoresis on the convective heat transfer enhancement of nanofluid in a microchannel

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

Temperature Distributions in Single Cell of Polymer Electrolyte Fuel Cell Simulated by an 1D Multi-plate Heat-Transfer Model and a 3D Numerical Simulation Model

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