The void fraction data obtained with a T-junction inlet showed a
linear relationship between the void fraction and volumetric quality,
in agreement with the homogeneous flow model predictions. In
contrast, the void fraction data from the reducing section inlet
experiments by Kawahara et al. [3] showed a non-linear void fraction-
to-volumetric quality relationship. This trend implies a strong
departure from homogeneous flow and indicates a large slip between
the liquid and gas phases. Kawahara et al. [3] observed
mainly long gas core flows surrounded by thin, thick and wavy liquid
films, which likely moved with a much slower velocity due to
a large viscous effect near the channel wall. They observed few
plug flows with short gas plugs for the same micro-channel connected
to a reducer inlet. Our results agree with observations reported
by Kawahara et al. [3]. From these data, it is clear that the
void fraction in a micro-channel strongly depends on the inlet
geometry and gas–liquid mixing method due to the significantly
different flow patterns that occur in the micro-channel. Thus, similar
void fraction data can be obtained in micro-channels and conventional
size channels, but the micro-channel void fraction is
sensitive to the inlet geometry and deviates significantly from
the Armand [23] correlation.
The void fraction data obtained with a T-junction inlet showed a
linear relationship between the void fraction and volumetric quality,
in agreement with the homogeneous flow model predictions. In
contrast, the void fraction data from the reducing section inlet
experiments by Kawahara et al. [3] showed a non-linear void fraction-
to-volumetric quality relationship. This trend implies a strong
departure from homogeneous flow and indicates a large slip between
the liquid and gas phases. Kawahara et al. [3] observed
mainly long gas core flows surrounded by thin, thick and wavy liquid
films, which likely moved with a much slower velocity due to
a large viscous effect near the channel wall. They observed few
plug flows with short gas plugs for the same micro-channel connected
to a reducer inlet. Our results agree with observations reported
by Kawahara et al. [3]. From these data, it is clear that the
void fraction in a micro-channel strongly depends on the inlet
geometry and gas–liquid mixing method due to the significantly
different flow patterns that occur in the micro-channel. Thus, similar
void fraction data can be obtained in micro-channels and conventional
size channels, but the micro-channel void fraction is
sensitive to the inlet geometry and deviates significantly from
the Armand [23] correlation.
การแปล กรุณารอสักครู่..
![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)