An experimental study of critical heat flux in very high heat flux subcooled boiling

Vandervort, Christian; Bergles, A. E.; Jensen, Michael K.

doi:10.1016/0017-9310(94)90019-1

Cited by 149 publications

(27 citation statements)

References 7 publications

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“…There do not seem to be any data available for CHF in microchannels, so the best that can be done is look for CHF data in small-diameter tubes. Extensive experiments were conducted with tubes down to 0.3-mm diameter [52]. It was ascertained that CHF increased continuously as the diameter was reduced to this value, with other conditions remaining the same (see Figure 8).…”

Section: Critical Heat Fluxmentioning

confidence: 99%

Boiling and Evaporation in Small Diameter Channels

Bergles

Lienhard

Kendall

et al. 2003

Heat Transfer Engineering

170

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Section: Critical Heat Fluxmentioning

confidence: 99%

Boiling and Evaporation in Small Diameter Channels

Bergles

Lienhard

Kendall

et al. 2003

Heat Transfer Engineering

170

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“…A study of CHF for water in tubes of diameters of 0.3 to 2.7 mm was conducted by Vandervort et al [7] under the following conditions: mass fluxes of 5000 to 40000 kg/m²-s, exit subcoolings of 40 to 135°C, length-to-diameter ratios of 2 to 50, and exit pressure of 0.2 to 2.2 MPa. The values for CHF were measured to be in the range of 20 to 80 MW/m², and increased with an increase in mass flux and subcooling, but decreased with increasing channel diameter.…”

Section: Introductionmentioning

confidence: 99%

Flow Boiling Heat Transfer to a Dielectric Coolant in a Microchannel Heat Sink

Chen

Garimella

2007

IEEE Trans. Comp. Packag. Technol.

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This paper presents an experimental study of flow boiling heat transfer in a microchannel heat sink. The dielectric fluid Fluorinert FC-77 is used as the boiling liquid after it is fully degassed. The experiments were performed at three flow rates ranging from 30 to 50 ml/min. The heat transfer coefficients, as well as the critical heat flux, were found to increase with flow rate. Wall temperature measurements at three locations (near the inlet, near the exit, and in the middle of heat sink) reveal that wall dryout first occurs near the exit of the microchannels. The ratio of heat transfer rate under critical heat flux conditions to the limiting evaporation rate was found to decrease with increasing flow rate, asymptotically approaching unity. Predictions from a number of correlations for nucleate boiling heat transfer in the literature are compared against the experimental results to identify those that provide a good match. The results of this work provide guidelines for the thermal design of microchannel heat sinks in two-phase flow.

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“…(19) obtained by Hata et al (2004) under steady state and transient conditions. Moreover, it was found that the Vandervort et al (1994) are plotted in Fig.6. It was found that the Shibahara, Fukuda, Liu, Hata, Nakamura, Muroga, Tokitani and Noto, Journal of Thermal Science and Technology, Vol.11, No.3 (2016) CHF was affected by the e-folding time under transient conditions.…”

Section: Discussionmentioning

confidence: 97%

Transient critical heat flux for subcooled boiling of water flowing upward through a vertical small-diameter tube with exponentially increasing heat inputs

Shibahara

Fukuda

Liu

et al. 2016

JTST

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Knowledge of transient critical heat flux (CHF) for subcooled boiling of water flow is important for the design of cooling devices such as fusion reactor divertor. Heating occurs rapidly in the divertor and the heat flux is estimated to reach 10 MW/m 2 because of plasma disruption. To cope with such a heat flux under the transient condition, the use of a small inner diameter tube (< 3 mm diameter) is recommended, since the use of a smaller inner diameter tube results in a higher CHF. The transient CHF of subcooled boiling of water was measured for a 1.0 mm inner diameter tube, which was heated exponentially, with inlet subcoolings ranged from 82 to 145 K and a flow velocity of 10 m/s. The heat generation rate of the tube was exponentially increased according to the function Q 0 exp(t/). E-folding time, , ranged from 182 ms to 30.5 s. It was found that the transient CHF increased as the e-folding time decreased and that CHF of the small-diameter tube was higher than that of conventional channels. This indicated that CHF is affected by the e-folding time under transient conditions.

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An experimental study of critical heat flux in very high heat flux subcooled boiling

Cited by 149 publications

References 7 publications

Boiling and Evaporation in Small Diameter Channels

Boiling and Evaporation in Small Diameter Channels

Flow Boiling Heat Transfer to a Dielectric Coolant in a Microchannel Heat Sink

Transient critical heat flux for subcooled boiling of water flowing upward through a vertical small-diameter tube with exponentially increasing heat inputs

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