The nonlinear dynamic model for parallel uniformly heated channels with supercritical water under vertical seismic accelerations

Lee, Jin-Der; Chen, Shao Wen

doi:10.1063/5.0026640

Cited by 1 publication

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“…Based on our preliminary work [22] employing the external force method to evaluate seismic impact, the non-linear dynamic model of parallel supercritical water uniformlyheated channels in the static system developed previously by the authors [14] is extended to the vertical vibration system. The modelling structure involving M parallel uniformlyheated channels subject to vertical seismic acceleration at a supercritical pressure is displayed in Figure 1.…”

Section: The Model and Solution Methodsmentioning

confidence: 99%

Non-Linear Qualitative Dynamic Analysis of Supercritical Water-Heated Channels under External Vertical Accelerations

Lee

Chen

2021

Applied Sciences

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Employing the external force method to regard seismic impact and the three-region methodology to analyze the supercritical heated channel, a non-linear dynamic model was developed to investigate the transient characteristics of single channel or parallel channels under the impacts of vertical sinusoidal and seismic accelerations. The present model was validated against the experimental data, which could suitably estimate the additional pressure drop caused by the vertical vibrations. The influences of parameters on the seismic-induced oscillation conducted in a supercritical heated channel indicated that a longer heated length, uprating operation power and a larger outlet loss coefficient all exhibit unstable effects, while the increase of inlet loss coefficient, a larger tube diameter and a lower inlet fluid temperature would tend to stabilize the system. Moreover, the supercritical fluid would present a high natural frequency in the very small NP-SUB region. The parametric effects on the parallel channel system are related to the inherent stability nature of initial state and the interactions among channels. The more uneven heat flux distribution among channels would cause a larger vibration-induced oscillation. In particular, when it is combined with the resonance effect, the system may exhibit much larger oscillations than in the case of non-resonance.

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Section: The Model and Solution Methodsmentioning

confidence: 99%