Direct measurements and prediction of the particle egress from a vortex-based solar cavity receiver with an open aperture
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(Published version)
Date
2022
Authors
Tang, Y.
Sun, Z.
Tian, Z.
Chinnici, A.
Lau, T.
Saw, W.
Nathan, G.J.
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Journal article
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Solar Energy, 2022; 235:105-117
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We report direct, in-situ measurements and numerical predictions of the normalised particle egress from a vortex-based particle solar receiver with an open aperture under iso-thermal conditions. These represent an important advancement toward meeting the challenge of developing both a suitable configuration and control strategy for operation of an open-to-atmosphere vortex reactor without significant particle egress. This control strategy induces a net inflow through the aperture by over-ventilating the outlet port as means to mitigate particle egress (here polymethylmethacrylate particles) for one configuration of the device. The influences of the level of over-ventilation, the Froude number and the Stokes number on the overall normalised particle number from the receiver were investigated using a planar laser-based Mie scattering method and computational fluid dynamics. It was found that, although this control strategy can be configured to mitigate particle egress from the vortex-based particle solar receiver with an open aperture, this will require significant over-ventilation of the cavity for the present configuration. The sensitivity analysis also found that slight over-ventilation is the most significant factor on controlling particle egress while significant over-ventilation is less effective considering the impact on thermal performance and the demand of fan power. This represents an important step toward the development of a windowless reactor, although further development of the configuration is needed to achieve efficient mitigation.
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Copyright 2022 International Solar Energy Society
Access Condition Notes: Accepted manuscript available after 1 April 2024