Predictions of void fraction in convective subcooled boiling channels using a one-dimensional two-fluid model

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Journal of Heat Transfer

DOI:https://doi.org/10.1115/1.2822656· OSTI ID:478497

Hu, Lin-Wen; Pan, Chin ^[1]

---

1. National Tsing Hua Univ., Hsinchu (Taiwan, Province of China)

Subcooled nucleate boiling under forced convective conditions is of considerable interest for many disciplines, such as nuclear reactor technology and other energy conversion systems, due to its high heat transfer capability. For such applications, the liquid entering the heating channel is usually in a subcooled state and nucleate boiling is initiated at some distance from the entrance. Further downstream from the boiling incipient point, the bubbles may depart from the heating wall. The point of first bubble departure is called the net vapor generation (NVG) point, because after this point, significant void is present in the subcooled liquid and the void fraction rises very rapidly even though the bulk liquid may still be in a highly subcooled state. The presence of vapor bubbles, which are at a temperature near the saturation temperature, in a subcooled liquid shows the existence of thermal nonequilibrium, which complicates the analysis of this boiling regime. 13 refs., 4 figs.

• Sponsoring Organization: USDOE
• OSTI ID: 478497
• Journal Information: Journal of Heat Transfer, Journal Name: Journal of Heat Transfer Journal Issue: 3 Vol. 117; ISSN 0022-1481; ISSN JHTRAO
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
66 PHYSICS
99 GENERAL AND MISCELLANEOUS
FLOW MODELS
FORCED CONVECTION
NUCLEATE BOILING
SUBCOOLED BOILING
TWO-PHASE FLOW
VOID FRACTION