Abstract
Experiments are carried out to study the feature of pressure fluctuating in helical coil for both adiabatic and boiling steam-water two-phase flows. And the effects of heat flux on the fluctuations are the stressed study. It shows that heat flux has great influence on the fluctuation feature. The root mean square (RMS) of the fluctuation process under low heat flux is similar to that of the adiabatic flow, while the RMS of great heat flux differs greatly from that of the adiabatic flow. The fractal dimension is close to 1.50 under of great heat flux, which means the pressure fluctuating is approaching to the stochastic process. The correlation dimension increases with the increase of heat flux. The Kolmogorov entropy on low heat flux is greater than that of the adiabatic flow, while the contrary appears under great heat flux. It can be concluded that the flow pattern map and transition theories for flow patterns on the basis of adiabatic flow just can be extrapolated to boiling flow with low heat flux.
| Original language | English |
|---|---|
| Pages (from-to) | 1-6 |
| Number of pages | 6 |
| Journal | Hedongli Gongcheng/Nuclear Power Engineering |
| Volume | 22 |
| Issue number | 1 |
| State | Published - Feb 2001 |
Keywords
- Fractal theory
- Heat flux
- Helical coil
- Pressure fluctuation
- Steam-water two-phase flow