53 research outputs found
Discussion: “Natural-Circulation Tests With Water at 800 to 2000 Psia Under Nonboiling, Local Boiling, and Bulk Boiling Conditions” (Mendler, O. J., Rathbun, A. S., Van Huff, N. E., and Weiss, A., 1961, ASME J. Heat Transfer, 83, pp. 261–273)
No full textDiscussion: “Prediction of Two-Phase Pressure Drop and Density Distribution From Mixing Length Theory” (Levy, S., 1963, ASME J. Heat Transfer, 85, pp. 137–150)
No full textA Theoretical Study of the Transient Operation and Stability of Two-Phase Natural Circulation Loops
No full textMathematical models of the time-dependent behavior of two-phase natural- circulation loops were used to predict the operation and to explain the unusual instability sometimes observed. The initial results obtained for a loop similar to the Univ. of Minnesota loop were used to formulate a more complex and accurate model, and the predicted transient behavior was in close agreement with the experimental results from the Minnesota loop. For a 300psia, high-pressure loop, unstable oscillatory behavior was predicted under certain conditions and stable behavior under others. Closed unstable regions rather than limits were predicted, and the specifications of stability in terms of a single parameter were found to be impossible. The great difference in oscillatory frequencies observed at low and high pressures was found to be due largely to the system geometry. The criterion for the absence of oscillations was found to be similar to one of the criteria for stability of chemical reaction systems. (D.L.C.
Discussion: “Phase Velocities in Boiling Flow Systems by Total Energy and by Diffusion” (Polomik, E. E., 1966, ASME J. Heat Transfer, 88, pp. 10–17)
No full textDiscussion: “An Analysis of Burnout Conditions for Flow of Boiling Water in Vertical Round Ducts” (Becker, K. M., and Persson, P., 1964, ASME J. Heat Transfer, 86, pp. 515–524)
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