Mixed Convection and Radiation Heat Transfer in a Horizontal Duct with Variable Wall Temperature

Ganesan, Rajamohan; Narayanaswamy, Ramesh; Perumal, Kumar

doi:10.1080/01457632.2014.923978

Cited by 7 publications

(1 citation statement)

References 18 publications

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“…Sadik et al [20] reported on different Nusselt number correlations for hydro-dynamical and thermal fully developed flow for combined free and forced convection heat transfer in horizontal and vertical circular tubes subjected to uniform wall heat flux conditions as well as uniform wall temperature boundary conditions. Ganesan, et al [21] experimentally investigated the effects of laminar flow mixed-convection and surface-radiation heat transfer in a horizontal duct. They found that the surface temperatures were affected by the heat flux and emissivity of the walls, Reynolds number and length of the duct.…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical Non-Uniform Heat Flux Distributions For Laminar Flow Heat Transfer With Mixed Convection In a Horizontal Circular Tube

Okafor

Dirker

Meyer

2018

Heat Transfer Engineering

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Non-symmetric heat flux distributions in terms of gravity in solar collector tubes influence buoyancy-driven secondary flow which has an impact on the associated heat transfer and pressure drop performance. In this study influence of the asymmetry angle (0°, 20°, 30° and 40°) with regard to gravity for non-uniform heat flux boundaries in a horizontal circular tube was investigated numerically. A stainless steel tube with an inner diameter of 62.68 mm, a wall thickness of 5.16 mm, and a length of 10 m was considered for water inlet temperatures ranging from 290 K to 360 K and inlet Reynolds numbers ranging from 130 to 2000. Conjugate heat transfer was modelled for different sinusoidal type outer surface heat flux distributions with a base-level incident heat flux intensity of 7.1 kW/m 2. It was found that average internal heat transfer coefficients increased with the circumferential span of the heat flux distribution. Average internal and axial local heat transfer coefficients and overall friction factors were at their highest for symmetrical heat flux cases (gravity at 0º) and lower for asymmetric cases. The internal heat transfer coefficients also increased with the inlet fluid 2 temperature and decreased with an increase in the external heat loss transfer coefficient. Friction factors decreased with an increase in fluid inlet temperature or an increase in the external heat loss transfer coefficients of the tube model.

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Section: Introductionmentioning

confidence: 99%

Asymmetrical Non-Uniform Heat Flux Distributions For Laminar Flow Heat Transfer With Mixed Convection In a Horizontal Circular Tube

Okafor

Dirker

Meyer

2018

Heat Transfer Engineering

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Numerical investigation of combined convection and radiation heat transfer in the horizontal ducts heated from different orientations

Ganesan¹,

Sung²,

Kumar³

et al. 2022

Industrial, Mechanical and Electrical Engineering

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Analyzing the thermal performance of transient heat transfer mechanism due to the combined effects of solar energy and variable surface temperature: Growing applications of solar energy in co-axial pipes

Bibi,

Ashraf,

Xinhua

et al. 2024

Physics of Fluids

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The current analysis is carried out to study the laminar convective heat transfer characteristics that change with time in the co-axial pipes along the impact of heat radiation and variable surface temperature. The flow is assumed along the axial direction of the pipe, and variable boundary condition is assumed at the surface of the pipe due to the variable surface temperature. A two-dimensional mathematical model made up of non-linear partial differential equations is solved using the implicit finite difference method. The project involves predicting the thermal efficiency of a pipe's time dependent flow across a number of flow model-relevant parameter ranges. Graphical representations highlighted the derived predictions. After separating the numerical solutions into the time independent and the time dependent components, the time dependent energy and surface shearness were found using the data from the time independent component. Comprehensive detail of the obtained results for the non-dimensional parameters included in the flow formulation is predicted for steady state velocity, temperature distribution, time dependent surface sheerness, and time dependent energy sheerness, which is given in results and discussion section of the manuscript. Major focus is given on the influence of the radiation parameter on the above-mentioned primary measures. Furthermore, it is concluded that in all cases, the steady state flow is as R→∞ and velocity profile as U→1 and θ→0, which ensured the accuracy of the obtained results by satisfying the boundary conditions. For various values of the fluid's absorption parameter D = 1.0, 3.0, 5.0, and 10.0, the flow profile is increased and U→1 as R→∞. Simultaneously, thermal distribution also increases and θ→0 as R→∞.

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Mixed Convection and Radiation Heat Transfer in a Horizontal Duct with Variable Wall Temperature

Cited by 7 publications

References 18 publications

Asymmetrical Non-Uniform Heat Flux Distributions For Laminar Flow Heat Transfer With Mixed Convection In a Horizontal Circular Tube

Asymmetrical Non-Uniform Heat Flux Distributions For Laminar Flow Heat Transfer With Mixed Convection In a Horizontal Circular Tube

Numerical investigation of combined convection and radiation heat transfer in the horizontal ducts heated from different orientations

Analyzing the thermal performance of transient heat transfer mechanism due to the combined effects of solar energy and variable surface temperature: Growing applications of solar energy in co-axial pipes

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