Expanding application of cryogenic void fraction sensors

Filippov, Yu. P.; Alexeyev, A.I.; Ivanov, A. V.; Lunkin, B. V.

doi:10.1016/0011-2275(93)90197-v

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…Das and Pattanayak [30] measured the time history of local void fraction by a pair of flat electrode ((k)-type sensor) and identified the flow pattern regime of LN2 flows using a probability distribution function method. Filippov et al [31,32,33] developed a (h)-type sensor and a (l)-type sensor for helium, hydrogen and nitrogen flows. Although calibration curves are proposed, this research is based on the assumption that the gas and liquid distribution in the pipe is homogeneous, and the influence of the flow regime seems to be not taken into account.…”

Section: State-of-the-artmentioning

confidence: 99%

Void fraction measurement in cryogenic flows. Part I: Design and validation of a void fraction capacitive sensor

et al. 2018

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This manuscript presents the design of a capacitive void fraction sensor for cryogenic LN2 two phase flows and its validation at room conditions. The capacitive void fraction sensor is first designed by means of Electric Field Analysis (EFA) simulations taking into account specific technical constraints coming from the test section in which it should be accommodated. Then it is manufactured and validated using a proper combination of fluids (Polydimethylsiloxane (PDMS) and air) having a dielectric constant ratio similar to the one encountered in LN2/GN2 two phase flows. The validation is performed through comparison with void fraction measured by means of optical visualizations and shows how the capacitive measurement technique robustness allows obtaining reasonable accurate values of void fraction also for the substitute fluid case. The sensor presented in this manuscript was used to evaluate the void fraction during LN2 chilldown of a rectangular cooling channel and the results are presented in the second part of this work.

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