TY - GEN
T1 - BOILING-INDUCED TWO-PHASE NATURAL CONVECTION IN AN ANNULAR CHANNEL HEATED ON THE DOWNWARD FACING SIDE
AU - Liu, Y. C.
AU - Cheung, F. B.
N1 - Funding Information:
This work was supported by the U. S. Nuclear Regulatory Commission under Contract No. NRC-04-93-061.
Publisher Copyright:
© 1998 American Society of Mechanical Engineers (ASME). All rights reserved.
PY - 1998
Y1 - 1998
N2 - The process of two-phase natural convection in an annular channel formed between a heated hemispherical vessel and a surrounding thermal insulation structure is studied theoretically and experimentally. The flow, being driven by buoyancy, is induced entirely by the boiling process taking place on the downward-facing side of the channel, i.e., on the outer surface of the heated vessel. Results of the flow analysis and the experimental observations indicate that there is a strong interaction between the induced twophase motion and the boiling process. While the mass flow rate ofthe induced flow is a strong function of the wall heat flux, the rate of boiling is significant affected by the resulting flow. Relative to the case without thermal insulation, a higher boiling heat transfer is obtained in the present case, evidently due to an enhanced mass flow rate induced by the boiling process with the presence of a thermal insulation structure.
AB - The process of two-phase natural convection in an annular channel formed between a heated hemispherical vessel and a surrounding thermal insulation structure is studied theoretically and experimentally. The flow, being driven by buoyancy, is induced entirely by the boiling process taking place on the downward-facing side of the channel, i.e., on the outer surface of the heated vessel. Results of the flow analysis and the experimental observations indicate that there is a strong interaction between the induced twophase motion and the boiling process. While the mass flow rate ofthe induced flow is a strong function of the wall heat flux, the rate of boiling is significant affected by the resulting flow. Relative to the case without thermal insulation, a higher boiling heat transfer is obtained in the present case, evidently due to an enhanced mass flow rate induced by the boiling process with the presence of a thermal insulation structure.
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U2 - 10.1115/IMECE1998-0578
DO - 10.1115/IMECE1998-0578
M3 - Conference contribution
AN - SCOPUS:85124403248
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 29
EP - 36
BT - Heat Transfer
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 1998 International Mechanical Engineering Congress and Exposition, IMECE 1998
Y2 - 15 November 1998 through 20 November 1998
ER -