Experiments in Conventional Size Channels

It was shown by Zhao and Bi (2001b) that the void fractions for slug flow in the triangular channels of Jh = 0.87—2.9 mm can be obtained from the measured 

Note that Eq. (5.14) is very close to a = 0.833/3 for large circular tubes given by Ar-mand (1946). Equation (5.14) is compared with the experimental data in Fig. 5.24. It is evident from Fig. 5.24 that the experimental data for the three tested channels can be best approximated by Eq. (5.14), 95% of the data falling within the deviation of 10% when j3 0.8. Equation (5.14) may be used to obtain the pressure drop of two-phase flow through the triangular channels. 

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