Analysis of startup oscillations in natural circulation boiling systems

Show simple item record Pandey, Manmohan Lakshmanan, S. P. 2014-03-14T18:11:46Z 2014-03-14T18:11:46Z 2009-11
dc.identifier.citation Lakshmanan, S. P. and Pandey, Manmohan, “Analysis of Startup Oscillations in Natural Circulation Boiling Systems”, Nuclear Engineering and Design, DOI: 10.1016/j.nucengdes.2009.06.017, vol. 239, no. 11, pp. 2391–2398, Nov. 2009. en_US
dc.identifier.issn 0029-5493
dc.description.abstract The aim of the present work is to get an insight of the phenomena behind the low-pressure low-power transients that occur during startup of a natural circulation boiling system. A RELAP5 model developed for a test facility and its prototype is used to record additional system parameters that were not included in the data obtained from experiments. The flow oscillations observed during experimental and numerical studies are analyzed and classified. It is inferred that the low amplitude oscillations are not condensation induced geysering instabilities, but a density wave instability supported by flashing. The similarity between the nature of startup transients observed in the test facility and the prototype is also examined. The effect of flashing is more pronounced in the prototype due to the strong variation of saturation temperature as the length scale is 4 times that of the model. The time series data obtained from experimental observations and numerical simulations are analyzed to identify the structural nature of flow oscillations. The power spectral density estimated using fast Fourier transform (FFT) algorithm illustrates the chaotic nature of the signals. The nonlinear time series analysis (TISEAN) package has been used for the estimation of Lyapunov exponent and the Poincaré section. The Poincaré section and the Lyapunov exponent confirm the chaotic nature of the flow oscillations. en_US
dc.description.statementofresponsibility by S.P. Lakshmanan and Manmohan Pandey
dc.format.extent Vol. 239, No. 11, pp. 2391–2398
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Natural circulation en_US
dc.subject Flow oscillations en_US
dc.subject Nonlinear time series analysis en_US
dc.subject Numerical simulation en_US
dc.subject Onlinear time series analysis en_US
dc.subject Numerical studies en_US
dc.subject Natural convection en_US
dc.subject Time series analysis en_US
dc.title Analysis of startup oscillations in natural circulation boiling systems en_US
dc.type Article en_US
dc.relation.journal Nuclear Engineering and Design

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