Utility of hot-film anemometry technique in horizontal bubbly two-phase flow
Utility of the hot-film anemometry technique in a horizontal bubbly flow-pattern is examined. It is shown that a single probe can be used for identifying the gas and liquid phases. Analyzing the nature of the voltage signal, a signal processing scheme is developed for measurements of time-averaged local void fraction distribution as well as for the measurements of local mean axial velocity and turbulent intensity in the liquid phase. The signal processing scheme is optimized so it can be used in a very high void-fraction region toward the top of the pipe, which is the unique characteristic of bubbly two-phase flow in horizontal channels. To verify the accuracy of the proposed method combined effects of the local void fraction and liquid velocity measurements are checked against the global measurements of liquid flow rate. The results are found to be satisfactory within the experimental uncertainties. Furthermore, the area-averaged void fraction obtained from the hot-film probe measurements compared well with the quick-closing valve technique measurements. The results show that the hot-film probe method is accurate and reliable for the local measurements of void fraction, liquid velocity and turbulent intensity in horizontal bubbly flow provided that the data is processed properly. Some results of the local measurements of time-averaged void fraction, axial mean velocity and turbulent intensity at relatively low and high gas flows are also presented for a horizontal air-water bubbly flow-pattern in a 50.3 mm ID pipe.
- Research Organization:
- Univ. of Wisconsin, Milwaukee, WI (US)
- OSTI ID:
- 20002429
- Report Number(s):
- CONF-990805--
- Country of Publication:
- United States
- Language:
- English
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