Boiling heat transfer and dryout in helically coiled tubes under different pressure conditions
2014; Elsevier BV; Volume: 71; Linguagem: Inglês
10.1016/j.anucene.2014.04.015
ISSN1873-2100
AutoresYoung-Jong Chung, Kyoo-Hwan Bae, Keung Koo Kim, Won‐Jae Lee,
Tópico(s)Heat Transfer and Optimization
ResumoA helically coiled once-through steam generator has been used widely during the past several decades for small nuclear power reactors. The heat transfer characteristics and dryout conditions are important to optimal design a helically coiled steam generator. Various experiments with the helically coiled tubes are performed to investigate the heat transfer characteristics and occurrence condition of a dryout. For the investigated experimental conditions, Steiner–Taborek's correlation is predicted reasonably based on the experimental results. The pressure effect is important for the boiling heat transfer correlation. A boiling heat transfer tends to increase with a pressure increase. However, it is not affected by the pressure change at a low power and low mass flow rate. Dryout occurs at high quality test conditions investigated because a liquid film on the wall exists owing to a centrifugal force of the helical coil.
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