Linear stability analysis of flow instabilities with a nodalized reduced order model in heated channel

Paul, Subhanker; Singh, Suneet

doi:10.1016/j.ijthermalsci.2015.07.027

Cited by 14 publications

(3 citation statements)

References 37 publications

(71 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this section, based on previous studies [30], the heated channel is nodalized into N-nodes, as shown in Figure 7. To nodalize the channel, variation in enthalpy change was formulated in such a way that the nodalization scheme will behave like auto-adaptive schemes and, as it is adjusted, the node will size automatically (a similar idea has been used for two-phase flows in [28,45,46]).…”

Section: Case Iii: N-node Nodalization Schemementioning

confidence: 99%

See 1 more Smart Citation

The Effect of Nodalization Schemes on the Stability Characteristics of a Three Heated Channels under Supercritical Flow Condition

Singh

Berrouk

Saeed³

2022

Energies

View full text Add to dashboard Cite

The present analysis is aimed at conducting node sensitivity analysis on the thermal–hydraulic performance of supercritical fluid in a three parallel channel configuration system. The heated channel was divided into different nodes and is examined under wide-ranging operating conditions. Firstly, the heated channel was divided into two nodes, like the two-phase flow system. In the second case, based on the correlation between the fluid properties, the heated channel was divided into three regions: heavy, mixture, and supercritical fluids. Finally, the channel was divided into N-nodes. Post the nodalization analysis, a non-linear analysis of three parallel channels was carried out under varied heat flux conditions. The analytical approximation functions were developed to capture the fluid flow dynamics. These functions were used to capture each node’s density, enthalpy, and velocity profiles under a wide range of operating conditions. The different flow instability (density wave oscillations and static) characteristics were observed at low pseudo- and relatively high subcooling numbers. In the density wave oscillations regime, out-of-phase oscillations and limit cycles are observed. A co-dimension parametric analysis with numerical simulations was carried out to confirm the obtained non-linear characteristics. Such analysis for parallel channel systems under supercritical working fluid flow conditions is missing in the literature which is limited to only linear stability analysis. This analysis can help to improve heat and mass transfer for designing efficient heated channel systems.

show abstract

Section: Case Iii: N-node Nodalization Schemementioning

confidence: 99%

“…However, they have not reported the occurrence of Ledinegg instability in their system. In this continuation, several authors also used the n-node nodalization scheme based on the different interpretation of equation of states to divide the heated channel into n-number of nodes [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nodalization Schemes on the Stability Characteristics of a Three Heated Channels under Supercritical Flow Condition

Singh

Berrouk

Saeed³

2022

Energies

View full text Add to dashboard Cite

show abstract

“…Furthermore, the effects of system pressure and inlet resistance coefficient on flow stability under cosine heat flux were studied. A nodalized reduced order model (NROM) was developed to analyze DWO in forced circulation and natural circulation (Paul et al [31]), which found that the stability boundaries of both circulations correlate with the number of nodes, and the Friedel model for friction factor calculation produces the most accurate result compared with the other four models. Paul et al [32] studied the influence of system pressure on DWO in single channel with the frequency domain method and homogeneous flow model, and found that the generalized Hopf (GH) point, which divides subcritical and supercritical Hopf regions, disappears with system pressure, emphasizing that there is only the subcritical region in the stability boundary.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Two-Phase Flow Heat Transfer Performance and Instability with Discrete Heat Sources in Parallel Channels

Wang

Yang

et al. 2021

Energies

View full text Add to dashboard Cite

With the rapid development of integrated circuit technology, the heat flux of electronic chips has been sharply improved. Therefore, heat dissipation becomes the key technology for the safety and reliability of the electronic equipment. In addition, the electronic chips are distributed discretely and used periodically in most applications. Based these problems, the characteristics of the heat transfer performance of flow boiling in parallel channels with discrete heat source distribution are investigated by a VOF model. Meanwhile, the two-phase flow instability in parallel channels with discrete heat source distribution is analyzed based on a one-dimensional homogeneous model. The results indicate that the two-phase flow pattern in discrete heat source distribution is more complicated than that in continuous heat source distribution. It is necessary to optimize the relative position of the discrete heat sources, which will affect the heat transfer performance. In addition, compared with the continuous heat source, the flow stability of discrete heat sources is better with higher and lower inlet subcooling. With a constant sum of heating power, the greater the heating power near the outlet, the better the flow stability.

show abstract

Does the Criteria of Instability Thresholds During Density Wave Oscillations Need to Be Redefined?

Paul

Fernandino

et al. 2020

Proceedings of the 7th International Conference on Advances in Energy Research

View full text Add to dashboard Cite

Linear stability analysis of flow instabilities with a nodalized reduced order model in heated channel

Cited by 14 publications

References 37 publications

The Effect of Nodalization Schemes on the Stability Characteristics of a Three Heated Channels under Supercritical Flow Condition

The Effect of Nodalization Schemes on the Stability Characteristics of a Three Heated Channels under Supercritical Flow Condition

Numerical Investigation on Two-Phase Flow Heat Transfer Performance and Instability with Discrete Heat Sources in Parallel Channels

Does the Criteria of Instability Thresholds During Density Wave Oscillations Need to Be Redefined?

Contact Info

Product

Resources

About