Combined experimental and numerical approaches to multi-mode heat transfer between vertical parallel plates

Krishnan, A.; Premachandran, B.; Balaji, C.; Venkateshan, S. P.

doi:10.1016/j.expthermflusci.2004.02.002

Cited by 38 publications

(23 citation statements)

References 20 publications

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“…Such a procedure has been followed, for example, by Webb and Hill [1] and more recently by Krishnan et al [36] who used a combined experimental and numerical approach. Since we are modeling the full coupled heat transfer modes, it is easy to proceed exactly as it was done by experimentalists.…”

Section: Correlationsmentioning

confidence: 99%

“…As a result, if the wall temperatures are recorded from experiments, as in [1,36], the radiative and total heat transfer coefficient can be calculated accurately, and the convective heat transfer coefficient can be deduced by using either Eq. 15 or Eq.…”

Section: Wall Heat Fluxes and Heat Transfer Coefficientsmentioning

confidence: 99%

“…Laminar natural convection and surface radiation between vertical parallel plates, a central, highly emissive (ε = 0.85) hot plate and two unheated polished plates (ε = 0.05), was investigated experimentally by Krishnan et al [36] for various plate spacings. The temperature measurements were introduced as boundary conditions into a numerical code in order to obtain the convective heat transfer rates.…”

Section: Coupled Natural Convection and Radiation In Vertical Parallementioning

confidence: 99%

“…• Temperatures at the heated section used as boundary conditions for the computations [36] (rows 2b-c and 3b-c in Table 6). The temperature at the heated section is either the temperature distribution (Figs.…”

Section: Correlationsmentioning

confidence: 99%

“…13(c) and 13(f)) extracted from the coupled problem. For the four cases considered, the average temperatures of the adiabatic wall sections determined from the coupled problem are applied as boundary conditions [36]: at the RHS-wall (T = 292.7 K and T = 302.5 K for ε = 0.1 and ε = 1, respectively), at the bottom extension of the LHS-wall (T = 290.4 K and T = 290.8 K for ε = 0.1 and ε = 1, respectively), and at the top extension of the LHS-wall (T = 319.0 K and T = 309.0 K for ε = 0.1 and ε = 1, respectively). Note that the small increase in the average temperature of the RHS-wall for ε = 0.1 is enough to almost suppress the flow reversal, and that the top extension is colder for ε = 1 than for ε = 0.1.…”

Section: Correlationsmentioning

confidence: 99%

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Effect of surface radiation on natural convective flows and onset of flow reversal in asymmetrically heated vertical channels

Bousetta

Chénier

et al. 2013

International Journal of Thermal Sciences

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To cite this version:R. Li, M. Bousetta, Eric Chénier, Guy Lauriat. Effect of surface radiation on natural convective flows and onset of flow reversal in asymmetrically heated vertical channels. International Journal of Thermal Sciences, Elsevier, 2013, 65 (-), pp.9-27. <10.1016/j.ijthermalsci.2012.10.023>. Effect of surface radiation on natural convective flows and onset of flow reversal in asymmetrically heated vertical channels AbstractNumerical solutions on the influence of surface radiation on the laminar air flow induced by natural convection in vertical, asymmetrically-heated channels are discussed. Variable property effects are accounted for in a full-elliptic mathematical formulation. The density variation is determined from the state equation for ideal gas. The experimental design and data reported in Webb and Hill [1] are taken as the base cases for carrying out the computations. The occurrence of flow reversals is first considered and revisited for pure natural convection, and the Nusselt number correlations derived from the numerical results are favorably compared with those reported in [1]. It is shown that the general effect of surface radiation is to delete the onset of pocketlike recirculations at the top part of the channel, to reduce the heated wall temperatures, and to increase the facing wall temperatures. Comparisons with usual methods used for decoupling the surface radiation effects are discussed. In the range of parameters investigated, increases in differences between inlet and maximum wall temperatures up to 200 K are shown to have small influences on the flow field and negligible effects on heat transfer performances.Keywords: Natural convection, surface radiation, vertical channels, flow reversal, variable property effects, numerical simulations order of consistency of the numerical scheme β thermal coefficient of volumetric expansion,

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Section: Correlationsmentioning

confidence: 99%

Section: Wall Heat Fluxes and Heat Transfer Coefficientsmentioning

confidence: 99%

Section: Coupled Natural Convection and Radiation In Vertical Parallementioning

confidence: 99%

Section: Correlationsmentioning

confidence: 99%

Section: Correlationsmentioning

confidence: 99%

See 3 more Smart Citations

Effect of surface radiation on natural convective flows and onset of flow reversal in asymmetrically heated vertical channels

Bousetta

Chénier

et al. 2013

International Journal of Thermal Sciences

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Numerical Analysis of Thermal and Dynamic Behavior of a Roof Solar Collector

Ababsa

Bougoul

2016

Heat Trans. Asian Res.

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In some regions with a specific climate, summer comfort in the rooms located below the roof becomes critical if the roof system is not well designed. In order to analyze the efficiency of this system a numerical model was developed. This model is based on the study of the natural convection coupled with radiative heat transfer in an inclined air channel. The configuration studied is an inclined channel formed by two parallel plates. The upper and lower plates were maintained at fixed temperatures. The air flow in the channel which is due to the buoyancy forces is fully turbulent and the turbulence was modeled by using the k‐ε model. Some numerical results obtained were validated using the experimental works of Khedari and colleagues and those of Nouanégué and colleagues. The effect of physical and geometrical parameters and the radiative heat transfer on the channel behavior is shown. Correlations for Nusselt numbers and air flow rate were obtained as functions of the geometric parameters and the Rayleigh number. These correlations can be used in other models that represent this system.

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Modeling of natural convection and radiative heat transfer in inclined thermosyphon system installed in the roof of a building

Ababsa

Bougoul

2017

Heat Trans. Asian Res.

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Some construction laws require the integration of an open thermosyphon system having multiple functions to the building roof. In order to analyze the efficiency of this system, a numerical model was developed. This model is based on the study of the natural convection coupled with radiative heat transfer in an inclined air channel. Two configurations are studied, the first one is a simple channel formed by two parallel plates and the second one is equipped with fin blades joined to the upper plate. The air flow in the channel which is due to the buoyancy forces is fully turbulent and the turbulence was modeled using the k‐ε model. Some numerical results obtained were validated using the experimental ones of Khedari et al. (2002) and those of Nouanégué and Bilgen (2009). The effect of the radiative heat transfer on the mean Nusselt number was shown. Correlations for Nusselt numbers were obtained for the two configurations as functions of the geometric parameters and the Rayleigh number. The main objective of this study is to use these correlations in other models to facilitate the operation of this system

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Combined experimental and numerical approaches to multi-mode heat transfer between vertical parallel plates

Cited by 38 publications

References 20 publications

Effect of surface radiation on natural convective flows and onset of flow reversal in asymmetrically heated vertical channels

Effect of surface radiation on natural convective flows and onset of flow reversal in asymmetrically heated vertical channels

Numerical Analysis of Thermal and Dynamic Behavior of a Roof Solar Collector

Modeling of natural convection and radiative heat transfer in inclined thermosyphon system installed in the roof of a building

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