Self-Triggering Mechanism of Vapor Explosions for a Molten Tin and Water System
The self-triggering mechanism of vapor explosions was investigated analytically and experimentally using molten tin and water. First, we modeled a simple droplet system consisting of a hot liquid droplet in a pool of cold liquid. Then, to model the self-triggering mechanism, we assumed that an instability (i.e. perturbedoscillation) in the vapor/cold-liquid interface produces a collapse of the vapor film, which in turn would produce a vapor explosion. To investigate the stability of perturbed oscillations in a vapor film, we did a linear stabilityanalysis of a vapor film surrounding a hot liquid. We found that there was a region of film stability in the cold-liquid temperature where spontaneous vapor explosions did not occur.<BR>To validate our model, we experimentally determined the thermal interaction zone (TIZ) in which spontaneous vapor explosions occur. The occurrence conditions for spontaneous vapor explosions were investigated for moltentin, as the hot liquid, dropped into a water pool, as the cold liquid. We varied the tin temperature and the water temperature, and then monitored the occurrence and location of spontaneous vapor explosions. We found that the upper limit for the water temperature of the TIZ can be explained by our model.
- Journal of nuclear science and technology
Journal of nuclear science and technology 33(4), p.298-306, 1996-04-25
Atomic Energy Society of Japan