NDLI: Numerical investigation on the dryout point of annular flow in the upward narrow annuli with bilateral heating

Content Provider	Springer Nature Link
Author	Su, Guanghui Duan, Feng Qiu, Suizheng Xiao, Zejun Huang, Yanping
Copyright Year	2007
Abstract	Based on the fundamental conservation principles —the mass, momentum, and energy conservation equations of liquid films and the momentum conservation equation of vapor core, a theoretical three-fluid model has been developed to predict the dryout point of upward annular flow in vertical narrow annuli with bilateral heating. The range of the parameters are: pressure from 0.5 to 5.0 MPa; mass flow rate from 30 to 150 kg/(m$^{2}$·s); gap size from 1.2 to 2.0 mm. Through numerically solving the model, the relationships among the parameters of the critical quality (X $_{C}$), critical heat flux (Q $_{CHF}$), mass flow rate, system pressure, and the ratio of heat flux on the inner wall of the outer tube to that on the outer wall of the inner tube (q $_{o}$/q $_{i}$) are obtained and analyzed. The predicted results accurately match with the experimental data. For a fixed q $_{o}$, X $_{C}$ will increase with the decreases in the gap size and the tube curvature when the dryout point occurs on the outer wall of the inner tube. However, for a fixed q $_{i}$, when the dryout point occurs on the inner wall of the outer tube, the parametric trend is reverse. When the dryout point on the inner and outer walls occur simultaneously, X $_{C}$ reaches a peak value, and the ratio of q $_{o}$/q $_{i}$ at this position changes with the gap size and the tube curvature.
Starting Page	264
Ending Page	272
Page Count	9
File Format	PDF
ISSN	16737393
Journal	Frontiers of Energy and Power Engineering in China
Volume Number	1
Issue Number	3
e-ISSN	16737504
Language	English
Publisher	Higher Education Press
Publisher Date	2007-01-01
Publisher Institution	Chinese Universities
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	Power Engineering
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology

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