| Abstrak/Abstract |
A sharp increase in world energy demands which further results
in another large progress in the development of nuclear energy establishes
comprehensive developments on corresponding mitigation studies.
Therefore, as a scenario of accident called LOCA is fundamentally
considered, the related phenomena, i.e., the counter-current flow followed
by flooding in the primary circuit of PWR, is of a great importance. The
present work investigates characteristics of the flooding during a pair of
gas/low surface tension liquid counter-current two-phase flow in a complex
conduit representing a down-scaled of PWR hot leg typical geometry. Visual
observations were obviously carried out to observe the flow
phenomenology, while flow parameters were frequently varied. A typical
result reveals that the gas flow rate to initiate the flooding decreases with the
increase of liquid flow rate. Moreover, exhibiting locations of the onset
called locus, a front flooding tends to occur during relatively low liquid flow
rates while the higher liquid flow rates exhibit another flooding namely rear
flooding. Accordingly, the present investigation provides a package of
valuable information on a particular understanding towards the flooding
characteristics to overcome the efforts on promoting safety managements on
the operation of nuclear power plants.. |
