3. Results
3.1. Void fraction
In Fig. 5 the void fraction, a, is plotted versus the homogeneous
void fraction, b. The open symbols represent adiabatic flow, the
closed symbols represent two-phase flow in the range of heat flux
q = 4.5–14.4 W/cm2. The majority experiments were conducted at
of the. a > 0.8. The solid line shows the correlation obtained by
Kawahara et al. [3].
a ¼
0:03b0:5
1 0:97b0:5 : ð7Þ
The data and best-fit curve are highly non-linear indicating strong
deviations from linear relations for a homogeneous flow. For the latter,
Ali et al. [22] have reported that the void fraction in narrow
channels with dh 1 mm can be approximately given by an Armand-
type [23] correlation, a = 0.8b, which is shown by a dashed
line in Fig. 5. On the other hand, in the study by Serizawa et al.
[2] the cross-sectional averaged void fraction was correlated with
the Armand [23] correlation.
3. Results
3.1. Void fraction
In Fig. 5 the void fraction, a, is plotted versus the homogeneous
void fraction, b. The open symbols represent adiabatic flow, the
closed symbols represent two-phase flow in the range of heat flux
q = 4.5–14.4 W/cm2. The majority experiments were conducted at
of the. a > 0.8. The solid line shows the correlation obtained by
Kawahara et al. [3].
a ¼
0:03b0:5
1 0:97b0:5 : ð7Þ
The data and best-fit curve are highly non-linear indicating strong
deviations from linear relations for a homogeneous flow. For the latter,
Ali et al. [22] have reported that the void fraction in narrow
channels with dh 1 mm can be approximately given by an Armand-
type [23] correlation, a = 0.8b, which is shown by a dashed
line in Fig. 5. On the other hand, in the study by Serizawa et al.
[2] the cross-sectional averaged void fraction was correlated with
the Armand [23] correlation.
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