Abstract
Void fraction measurement by high-frame-rate neutron radiography and the error estimation were conducted. Measurement error on instantaneous void fraction and time-averaged void fraction of forced-convective subcooled boiling was evaluated experimentally and analytically. Measurement error would be within 18% and 2% for instantaneous void fraction (measurement time is 0.89 ms), and time-averaged void fraction, respectively. Void fraction distribution of subcooled-boiling was measured using atmospheric-pressure water in rectangular channels with channel width 30 mm, heated length 100 mm, channel gap 3 mm and 5 mm, inlet water subcooling from 10 to 30 K and mass velocity ranging from 240 to 2000 kg/(m2·s) . One-side of the channel was heated homogeneously. Instantaneous void fraction and time-averaged void fraction distribution were measured par-
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