Computational stability appraisal of rectangular natural circulation loop: Effect of loop inclination

Krishnani, Mayur; Basu, Debabrata

doi:10.1016/j.anucene.2017.04.012

Cited by 31 publications

(4 citation statements)

References 32 publications

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“…The effect of inclination was also examined and was reported to have a strong influence on the isotherm patterns. Recently 3-D CFD studies were performed by Basu et al (2013) [25] and Krishnani and Basu (2017) [26] where the effect of inclination on the transient behaviour of NCL systems was investigated and tilting the NCL was observed to have a stabilizing effect on the system transience.…”

Section: Literature On Rectangular Natural Circulation Systemsmentioning

confidence: 99%

Numerical investigation on the heat transfer coefficient jump in tilted single-phase natural circulation loop and coupled natural circulation loop

Dass

Gedupudi

2021

International Communications in Heat and Mass Transfer

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Section: Literature On Rectangular Natural Circulation Systemsmentioning

confidence: 99%

Numerical investigation on the heat transfer coefficient jump in tilted single-phase natural circulation loop and coupled natural circulation loop

Dass

Gedupudi

2021

International Communications in Heat and Mass Transfer

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“…Desrayaud et al [9] conducted 2-D numerical simulations to observe that an increase in the Rayleigh number leads to flow in instability in NCL. Along this line, Krishnani and Basu [10] performed 3-D numerical simulations to investigate the effects of loop rotation on flow behavior. They observed that the flow pattern changes if the rotation angle is varied.…”

Section: Introductionmentioning

confidence: 99%

Identification of Long-Term Behavior of Natural Circulation Loops: A Thresholdless Approach from an Initial Response

Bhattacharya

Saha

Mukhopadhyay

et al. 2021

Sci

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Natural circulation loop (NCL) systems are buoyancy-driven heat exchangers that are used in various industrial applications. The concept of passive heat exchange in NCL systems is attractive, because there is no need for an externally driven equipment (e.g., a pump) to maintain the fluid circulation. However, relying on buoyancy as the sole driving force may lead to several potential difficulties, one of which is generation of (possibly) time-varying nonlinearities in the dynamical system, where a difference in the time scales of heat transfer and fluid flow causes the flow to change from a steady-state regime to either an oscillatory regime or a flow-reversal regime, both of which are undesirable. In this paper, an algorithm is developed using tools of symbolic time-series analysis (e.g., probabilistic finite state automata (PFSA)) for the purpose of identifying selected regimes of operation in NCL systems using only data from the early transient operation, where the underlying principle is built upon the concept of pattern classification from measurements of fluid-flow dynamics. The proposed method is shown to be capable of identifying the current regime of operation from the initial time response under a given set of operational parameters. The efficacy of regime classification is demonstrated by testing on two datasets, generated from numerical simulation of a MATLAB SimuLink model that has previously been validated with experimental data. The results of the proposed PFSA-based classification are compared with those of a hidden Markov model (HMM) that serves as the baseline.

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“…Basu at al. [13] and Krishnani and Basu [14] studied the effect of inclination on the stability of the NCL system. Introducing a small tilt angle was reported to have a significant stabilizing effect even at large power input condition.…”

Section: Introductionmentioning

confidence: 99%

Fourier series based modeling of the dynamics of inclined closed loop buoyancy driven heat exchangers with conjugate effect

Dass¹,

Gedupudi²

2020

Preprint

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The modelling of the dynamics of inclined closed loop buoyancy driven heat exchangers with inclusion of the wall conduction effect at the heat exchanger is presented in the current study. A Coupled Natural Circulation Loop (CNCL) is an ideal system for studying the closed loop buoyancy driven heat exchanger. The modelling utilises a Fourier series based approach to develop a 1-D model which is then verified with the 3-D CFD studies of the respective cases. A good agreement is observed with the 3-D CFD data, which demonstrates the suitability of the 1-D model for transient behaviour prediction. The non-dimensional numbers and thermal coupling sensitivity coefficients which govern the dynamics of the CNCL are identified and an appropriate parametric study is conducted. Results show that the wall conduction and inclination have a significant effect on the transient behaviour of the CNCL system. A jump in the heat transfer coefficient with variation in the inclination of the Conjugate CNCL system is observed. The 1-D model is also able to capture the flow direction reversal with change in the inclination of the Conjugate CNCL system for zero flow field initial conditions.

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Computational stability appraisal of rectangular natural circulation loop: Effect of loop inclination

Cited by 31 publications

References 32 publications

Numerical investigation on the heat transfer coefficient jump in tilted single-phase natural circulation loop and coupled natural circulation loop

Numerical investigation on the heat transfer coefficient jump in tilted single-phase natural circulation loop and coupled natural circulation loop

Identification of Long-Term Behavior of Natural Circulation Loops: A Thresholdless Approach from an Initial Response

Fourier series based modeling of the dynamics of inclined closed loop buoyancy driven heat exchangers with conjugate effect

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