BURN-OUT ANALYSIS. PART 3. THE LOW-VELOCITY BURN-OUT REGIME
Technical Report
·
OSTI ID:4131645
Extensive burn-out data from Sweden was used to fully confirm the existence of a low-velocity, burn-out regime for water, and to determine accurately all its important characteristics. These include a precise (D G) and L/D effect on burn-out, both of which are shown to apply to data with L/D ratios varying from 50 to 792 and pressures from 15 to 2000 psia. Examination of rectangular channel data confirmed that the basic burn-out flux for a rectangular channel is linked with that for a round tube by a hydraulic diameter. For the single fluid considered, water, latent heat was found to dominate the pressure effect. This property adequately describes the burn-out phenomenon for pressures greater than about 200 psia, although for lower pressures there is an additional weak pressure effect which can be allowed for by introducing two extra property groups in the burn-out equation. These property groups correspond to the simplest of three sets of scaling laws considered. The boundary limits of the low-velocity regime were approximately defined and these show that the regime disappears at zero pressure and at the critical pressure, while at about 700 psia the regime extends to fairly high mass velocities, depending on the L/D ratio. The regime is extended by increasing the L/D ratio. A recommended burn-out equation is presented for the low-velocity regime, which, applied to the whole of the round tube data from the literature, achieves an accuracy corresponding to less than 6% R.M.S. error. (auth)
- Research Organization:
- United Kingdom Atomic Energy Authority. Reactor Group. Atomic Energy Establishment, Winfrith, Dorset, England (United Kingdom)
- NSA Number:
- NSA-18-005461
- OSTI ID:
- 4131645
- Report Number(s):
- AEEW-R-222
- Country of Publication:
- United Kingdom
- Language:
- English
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