General equation for heat transfer for laminar flow in ducts of arbitrary cross-sections

Yılmaz, Tuncay; Cihan, Ertuğrul

doi:10.1016/0017-9310(93)90009-u

Cited by 46 publications

(15 citation statements)

References 5 publications

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“…Uzun et al [5] numerically studied the convective heat transfer inside the irregular cross-sectional ducts using both uniform wall heat flux and uniform wall temperature boundary condition, by employing elliptic grid generation technique. Yilmaz et al [6] derived general equation for heat transfer in ducts of arbitrary cross-sections under constant wall temperature for laminar flow. Gupta et al [7] simulated the thermo-hydraulic performance for Reynolds number less than 200 of a trapezoidal channel with triangular cross-section and analysed the effect of apex, rounding of corners and the path shape.…”

Section: Laminar Convective 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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Section: Laminar Convective 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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“…Both streams are flows in ducts of rectangular cross-sections. Flows in ducts have been investigated extensively by many researches, whether regular [15][16][17][18] or irregular cross-sections [19][20][21][22][23][24], but as mentioned before, influences of real boundary conditions were seldom considered. The issue will be investigated in this research.…”

Section: Governing Equationsmentioning

confidence: 99%

Heat and mass transfer in a cross-flow membrane-based enthalpy exchanger under naturally formed boundary conditions

Zhang

2007

International Journal of Heat and Mass Transfer

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“…One can calculate the heat transfer in ducts of arbitrary cross-section with the definition of equivalent diameter only in turbulent flow. In laminar flow, it is not sufficient to define an equivalent diameter, because the boundary layer of each wall is influenced by the other wall (Yilmaz and Cihan, 1993). The lack of reliable correlations for condenser heat transfer, prevents an accurate prediction of collector thermal efficiency through theoretical models based on energy balances.…”

Section: Introductionmentioning

confidence: 98%

The effect of condenser heat transfer on the energy performance of a plate heat pipe solar collector

Facão

Oliveira

2005

Int. J. Energy Res.

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SUMMARYFor a novel prototype solar collector, using a plate heat pipe, condenser heat transfer was analysed in detail. The condenser has the shape of a rectangular channel. Flow and heat transfer of water in the rectangular channel was modelled and the heat transfer coefficient assessed, using the Fluent code. Under typical operating conditions a mixed convection situation occurs. The channel is inclined and heating is through one wall only (upper channel surface). The range of temperature differences considered was similar to the one verified under real operating conditions, covering a wide range of Grashof numbers. Results showed that the Nusselt number is significantly higher than the one for forced convection in a rectangular channel with fully developed boundary layers. In order to enhance heat transfer, a modification to the rectangular channel was analysed, using baffles to improve flow distribution and increase velocity. The effect of this modification on collector energy performance (efficiency) was assessed.

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General equation for heat transfer for laminar flow in ducts of arbitrary cross-sections

Cited by 46 publications

References 5 publications

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

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

Heat and mass transfer in a cross-flow membrane-based enthalpy exchanger under naturally formed boundary conditions

The effect of condenser heat transfer on the energy performance of a plate heat pipe solar collector

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