Mixed convection heat transfer in horizontal rectangular ducts with radiation effects

Chiu, Han-Chieh; Jang, Jer‐Huan; Yan, Wei‐Mon

doi:10.1016/j.ijheatmasstransfer.2007.01.010

Cited by 54 publications

(26 citation statements)

References 34 publications

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“…In addition, 3-D numerical analysis of combined convection-radiation heat transfer over a BFS and a recess in horizontal ducts were studied by several researchers [24]- [26]. The study of mixed convection heat transfer in 3-D horizontal and inclined ducts with considering radiation effects has been numerically examined in detail by Chiu et al [27] [28]. Those works were primarily focused on the interaction of the thermal radiation with mixed convection for a gray fluid in rectangular ducts.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Combined Radiation and Forced Convection Heat Transfer in 3D Laminar Flow over an Inclined Forward Facing Step

Rayeni¹,

Nassab²

2016

JECTC

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In the current study, a numerical investigation of three-dimensional combined convection-radiation heat transfer over an inclined forward facing step (FFS) in a horizontal rectangular duct is presented. The fluid is treated as a gray, absorbing, emitting and scattering medium. To simulate the incline surface of FFS, the blocked-off method is employed in this study. The set of governing equations for gas flow are solved numerically using the CFD technique to obtain the temperature and velocity fields. Since the gas is considered as a radiating medium, all of the convection, conduction and radiation heat transfer mechanisms are presented in the energy equation. For computation of radiative term in energy equation, the radiative transfer equation (RTE) is solved numerically by the discrete ordinates method (DOM) to find the divergence of radiative heat flux distribution inside the radiating medium. The effects of optical thickness, radiation-conduction parameter and albedo coefficient on heat transfer behavior of the system are carried out.

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Section: Introductionmentioning

confidence: 99%

Analysis of Combined Radiation and Forced Convection Heat Transfer in 3D Laminar Flow over an Inclined Forward Facing Step

Rayeni¹,

Nassab²

2016

JECTC

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“…Chiu et al [13] numerically simulated the effect of radiation on convective heat transfer by solving Energy and Navier-Stokes equation using Vorticity and Velocity method, in horizontal and inclined rectangular [14] crosssectional duct. From the results, they found that radiations have significant influence on the heat transfer and helps in reducing effect of thermal buoyancy.…”

Section: Convective-radiative Heat Transfermentioning

confidence: 99%

Numerical Simulation of Flow Through Equilateral Triangular Duct Under Constant Wall Heat Flux Boundary Condition

Kumar

Goel

2016

J. Inst. Eng. India Ser. C

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The force convective heat transfer in an equilateral triangular duct of different wall heat flux configurations was analysed for the laminar hydro-dynamically developed and thermally developing flow by the use of finite volume method. Unstructured meshing was generated by multi-block technique and set of governing equations were discretized using second-order accurate up-wind scheme and numerically solved by SIMPLE Algorithm. For ensuring accuracy, grid independence study was also done. Numerical methodology was verified by comparing results with previous work and predicted results showed good agreement with them (within error of ±5 %). The different combinations of constant heat flux boundary condition were analysed and their effect on heat transfer and fluid flow for different Reynolds number was also studied. The results of different combinations were compared with the case of force convective heat transfer in the equilateral triangular duct with constant heat flux on all three walls.

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“…The flow entering the duct is set to be at uniform inlet velocity, u i , and uniform inlet temperature, T i . The thermophysical properties of the nanofluids are affected by the buoyancy force and it is given in Table 1. For the radiation effect, the medium is considered as gray, absorbing, emitting, and scattering [16]. For the radiation model, P 1 method is used in the simulation and it is based on the expansion of the radiation intensity.…”

Section: Problem Description and Governing Equationsmentioning

confidence: 99%

“…This expression directly is substituted into the energy equation to account for sources due to radiation. Based on these simplifying assumptions, the steady-state and 3D governing conservation equations for the physical problem in this study can be written in dimensionless form as follows [4,16]:…”

Section: Problem Description and Governing Equationsmentioning

confidence: 99%

“…They observed that the heat transfer performance in a channel with a smaller aspect ratio is better than with a higher aspect ratio channel. Chiu et al [16] and Chiu and Yan [17] studied numerically mixed convection heat transfer in horizontal and inclined rectangular ducts with radiation effects. They described that the bulk temperature is higher with a stronger radiation effect due to radiative heat flux being an additional mode of energy transport.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat transfer enhancement for combined convection flow of nanofluids in a vertical rectangular duct considering radiation effects

Mohammed

Irmawati

Shuaib

et al. 2011

Heat Trans. Asian Res.

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In this paper, combined convective heat transfer and nanofluids flow characteristics in a vertical rectangular duct are numerically investigated. This investigation covers Rayleigh numbers in the range of 2 × 10 6 ≤ Ra ≤ 2 × 10 7 and Reynolds numbers in the range of 200 ≤ Re ≤ 1000. Pure water and five different types of nanofluids such as Ag, Au, CuO, diamond, and SiO 2 with a volume fraction range of 0.5% ≤ ϕ ≤ 3% are used. The three-dimensional steady, laminar flow, and heat transfer governing equations are solved using finite volume method (FVM). The effects of Rayleigh number, Reynolds number, nanofluids type, nanoparticle volume fraction of nanofluids, and effect of radiation on the thermal and flow fields are examined. It is found that the heat transfer is enhanced using nanofluids by 47% when compared with water. The Nusselt number increases as the Reynolds number and Rayleigh number increase and aspect ratio decreases. A SiO 2 nanofluid has the highest Nusselt number and highest wall shear stress while the Au nanofluid has the lowest Nusselt number and lowest wall shear stress. The results also revealed that the wall shear stress increases as Reynolds number increases, aspect ratio decreases, and nanoparticle volume fraction increases.

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Mixed convection heat transfer in horizontal rectangular ducts with radiation effects

Cited by 54 publications

References 34 publications

Analysis of Combined Radiation and Forced Convection Heat Transfer in 3D Laminar Flow over an Inclined Forward Facing Step

Analysis of Combined Radiation and Forced Convection Heat Transfer in 3D Laminar Flow over an Inclined Forward Facing Step

Numerical Simulation of Flow Through Equilateral Triangular Duct Under Constant Wall Heat Flux Boundary Condition

Heat transfer enhancement for combined convection flow of nanofluids in a vertical rectangular duct considering radiation effects

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