2013
DOI: 10.5539/mer.v3n1p25
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Abstract: Numerical three dimensional studies of the combined natural convection and radiation heat loss from downward facing open cavity receiver of different shapes is carried out in this paper. The investigation is undertaken in two categories: same inner heat transfer area and aperture area (case I) and same aspect ratio and aperture area (case II). These studies are carried out for five isothermal wall temperatures (523 to 923 K in steps of 100K). The effect of inclination is studied for seven inclinations from 0° … Show more

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Cited by 64 publications
(27 citation statements)
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“…Analyzing the losses, it can be concluded that reverse-conical cavities achieve the lowest radiation losses and then, the highest radiation efficiencies. Additionally, reverse-conical cavities are also an advantageous shape to reduce convection losses [3]. Apparently, the efficiency may be increased very smoothly with the decrease of the emissivity.…”
Section: Hg Temperature and Efficiency Resultsmentioning
confidence: 99%
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“…Analyzing the losses, it can be concluded that reverse-conical cavities achieve the lowest radiation losses and then, the highest radiation efficiencies. Additionally, reverse-conical cavities are also an advantageous shape to reduce convection losses [3]. Apparently, the efficiency may be increased very smoothly with the decrease of the emissivity.…”
Section: Hg Temperature and Efficiency Resultsmentioning
confidence: 99%
“…Despite that, real temperatures with the cavity vertically positioned (90°) are expected to be quite similar to this conservative results since convection losses [3] and conduction losses [12] are significantly lower than radiation ones even for lower temperatures (up to 650°C). Furthermore, the calculated radiation efficiencies would also be similar to the real ones for the given conditions and will follow the same trend in the real system.…”
Section: Temperature and Efficiency Calculationmentioning
confidence: 94%
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“…Many previous studies of convection in cavity receivers (e.g. [8,9,10,11]) have simplified the problem by imposing either a uniform temperature or a heat flux distribution on the inner cavity surface, thus decoupling the radiative and convective heat transfer problems. In this part of the current study, we also maintain a decoupling between the two heat transfer mechanisms, but instead impose a temperature distribution that is non-uniform (as suggested by the simplified, but integrated, modelling of thermal emissions and the heat transfer fluid [6]).…”
Section: Internal Recuperation Of Convective Lossesmentioning
confidence: 99%