A Preliminary Study of Boiling Burnout Heat Fluxes for Water in Vortex Flow

Gambill, W.R.; Greene, N.D.

doi:10.2172/4306809

Cited by 7 publications

(3 citation statements)

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“…(63,64) were much higher than film coefficients for pipe flow under equivalent pressure drop and flow rate conditions. Gambill and Greene (65) report ability to obtain extremely high heat fluxes without vapour blanketing of the surface with resultant "burnout". This is a further aspect of heat transfer which could lead to important and interesting developments in, for example, assisting to find a solution to heat transfer problems posed by rocket propulsion.…”

Section: Miscellaneous Cyclone Dutiesmentioning

confidence: 99%

Categories of Cyclone

Bustos¹

1965

The Hydrocyclone

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Section: Miscellaneous Cyclone Dutiesmentioning

confidence: 99%

Categories of Cyclone

Bustos¹

1965

The Hydrocyclone

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“…Its simple form allows a direct substitution of bulk velocity and subcooling. Subsequently, Gambill and Greene [6] modified the Gunther's correlation and suggested a new correlation given by (2), which also incorporates the effect of length to diameter ratio.…”

Section: Introductionmentioning

confidence: 99%

“…With regard to the evaluation of OFI under subcooled flow boiling conditions, only a limited number of empirical correlations were presented in previous studies compared to CHF. Whittle et al [17] presented a method to predict OFI by correlating the ratio of OFI heat flux(  q OFI ) to saturation heat flux(  q sat ) (R factor) as shown in (6). They experimentally studied subcooled flow boiling OFI for four narrow rectangular channels, and incorporated the effects of length and diameter in the correlation.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of thermal limits with one-side heated smooth channel for plasma facing component safety

Lim

Park

2021

Eng. Res. Express

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In order to stably operate the equipment inside the tokamak, which is loaded with a heat flux of several MW/m2 under the one-side heating condition, it is necessary to thoroughly prepare for various thermal engineering limits that may occur under the high heat flux load condition. In this study, we have experimentally explored critical heat flux (CHF) and onset of flow instability (OFI), which are considered potential threats in a DEMO fusion power plant. Specifically, the effect of system parameters on CHF was investigated. The results indicate that with an increase in subcooling and mass flux, the CHF increased, as it induced a faster bubble condensation near the CHF. As the system pressure increased, the CHF also increased. This is because the bubble size reduction effect was dominant in the pressure range of 1–10 bar. Most of the existing CHF correlations could evaluate the CHF with reasonable accuracy of within 25%; especially, the Boscary CHF correlation yielded the highest accuracy with an average error of 12%. Similar to CHF, OFI, which is a measure of the sudden fluctuations in the system pressure caused by a large amount of vapor generated due to the high heat flux, tended to increase as the subcooling, mass flow rate, and system pressure increased. Most of the existing OFI correlations yielded large error rates (more than 135%) as these correlations were primarily developed for micro-channels. Therefore, in this study, a new OFI correlation was developed using a Python code, in combination with an artificial intelligence (AI) regression method. The developed correlation can be used in the cooling system design of tokamaks, which involve a high-heat load condition on one-side of the reactor.

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