Contouring of an inertially cooled pump limiter for Tore Supra

Koski, J.A.; Dempsey, James F.; McGrath, R.T.

doi:10.1016/0920-3796(92)90045-6

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…Accordingly, we analyzed how the Reynolds number, which is a dimensionless number representing the flow rate, and the Jakob number, which represents the degree of subcooling, affect the R factor; the results are presented in figure 12. Each dimensionless number was obtained using equations ( 10) and (11). From the graph, it can be seen that the R factor decreases as the Re and Ja numbers increase.…”

Section: New Ofi Correlationmentioning

confidence: 99%

“…As a result, it was concluded that the CHF of the swirl tube can be calculated as 1.67 times the value obtained through the Tong-75 correlation [10], which is the well-known CHF correlation of the channel without a turbulence promoter (smooth tube). Koski [11] tried to explain the increased CHF performance of the swirl tube compared to the smooth tube by the frictional factor changed by the swirl tape. He argued that the CHF of the swirl tube could be accurately predicted if the fricational factor of the circular tube used in the Tong-75 correlation was replaced with that of the swirl tube.…”

Section: Introductionmentioning

confidence: 99%

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Onset of flow instability with one-side heated swirl tube for fusion reactor safety

Lim

Lee

et al. 2021

Nucl. Fusion

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In this study, the onset of flow instability (OFI) heat flux of a one-side heated swirl tube is experimentally investigated. The OFI heat flux means the minimum heat flux that can cause flow instability by the vapor generated in the flow path. An analysis of the effect of system parameters on the OFI heat flux indicates that as the pressure increases, the bubble size decreases. Therefore, the void fraction decreases and, consequently, the OFI heat flux tends to increase. Similarly, the higher the flow rate and degree of subcooling, the faster the vapor can be removed; thus, the OFI heat flux increases. In addition, the prediction performances of the existing OFI correlations developed under the subcooled flow-boiling condition are evaluated. Therefore, although the Wang correlation indicates the lowest error rate, it yields a high mean absolute error rate of 87.75%. Thus, it is difficult to predict the OFI heat flux of a one-side heated swirl tube using the existing OFI correlations. Therefore, in this study, a new correlation is developed using a Python code created by employing an artificial intelligence regression method. The developed correlation incorporates the impact of one-side heating, swirl tape, mass flow rate, subcooling, and pressure (mean absolute error = 12.17%, root mean square error = 14.99%).

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Section: New Ofi Correlationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Onset of flow instability with one-side heated swirl tube for fusion reactor safety

Lim

Lee

et al. 2021

Nucl. Fusion

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“…Here, Y phys (physical sputtering yield) and Q D (yield parameter) are taken from [4]. The surface temperature spatial distribution is based on previous calculations for this limiter geometry [25]. The temperature spatial distribution is scaled with the total heat flux (which varies as the density is varied).…”

Section: Modellingmentioning

confidence: 99%

“…Figure 9 shows the trend of BBQ model predictions for the dependence of the total C + influx (integrated over the limiter) on the total incident D + flux (also integrated over the limiter), when RES and physical sputtering contribute significantly. The calculations have been made for five values of the maximum limiter surface temperature, with the spatial profile of the limiter surface temperature [T surf (x, y, z)] scaled to the profile calculated in [25]. T max surf ranges from 600 to 2200 • C (a possible contribution from normal sublimation at the highest temperatures has not been included).…”

Section: Modellingmentioning

confidence: 99%

Particle flux and temperature dependence of carbon impurity production from an inertially-cooled limiter in Tore Supra

Tobin

DeMichelis

Hogan

et al. 1998

Plasma Phys. Control. Fusion

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A visible endoscope system and an infrared camera system have been used to study the flux of carbon from an inertially-cooled graphite limiter in Tore Supra. From the variation in the carbon flux with plasma parameters, new data have been obtained, describing the dependence of radiation enhanced sublimation (RES) and chemical sputtering on incident ion flux. Other characteristics of RES under plasma operation conditions have also been studied. The dependence of RES on incident deuterium particle flux density is found to be in reasonable agreement with the expected particle flux scaling over a range of particle fluxes varying by a factor of ∼25, extending the present scaling to higher flux density values. Chemical sputtering has been observed, but only in regions of the limiter with low incident deuterium fluxes. Values inferred for the chemical sputtering yield are similar to those measured with a temperaturecontrolled test limiter in Textor.

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