Experimental investigations on flow characteristics of two parallel channels in a forced circulation loop with supercritical water

Zhang, Lei; Cai, Benan; Yu, Wensheng; Gu, Hongfang; Wang, Haijun; Li, Hongzhi; Chatoorgoon, Vijay

doi:10.1016/j.applthermaleng.2016.05.182

Cited by 29 publications

(11 citation statements)

References 28 publications

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“…Similar parallel-channel experimental set-ups were adopted by Xiong et al [15] and Zhang et al [14] for their flow instability experiments. Detailed description of the experiments can be found in the literatures: Xi et al [11], Xiong et al [15], and Zhang et al [14]. The main effect of parallel channel on fluid flow and heat transfer with heating power beyond the threshold or critical power of flow instability is the occurrence of out of phase mass flow rate oscillations in the parallel channels.…”

Section: Figures 4(a)-(c) Respectively Show Schematic Diagram Of a Pamentioning

confidence: 99%

“…Type II instability occurs in region 4 when the heating power for transition region is World Journal of Engineering and Technology E. Shitsi et al Figure 37. Typical curve of type II instability [14]. Figure 38.…”

Section: Experimental Studies Addressing Flow Instability In Parallelmentioning

confidence: 99%

“…They observed also that type I oscillation region, stable region, transit region and type II oscillation region are four different regions the system passes through as a result of increased in heating Figure 35. Influence of inlet temperature on instabilities [14]. Figure 36.…”

Section: Experimental Studies Addressing Flow Instability In Parallelmentioning

confidence: 99%

“…Xiong et al [15] Zhang et al [14] investigated two types of DWOs experimentally at supercritical pressures in two parallel channels with supercritical water. They obtained stability boundaries in a two-dimensional plane using two different approaches: oscillation (2 -5 s).…”

Section: Experimental Studies Addressing Flow Instability In Parallelmentioning

confidence: 99%

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Flow Instability in Parallel Channels with Water at Supercritical Pressure: A Review

Shitsi¹,

Debrah²,

Agbodemegbe³

et al. 2018

WJET

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Research into flow instability at both subcritical and supercritical pressures has attracted attention in recent years because of its potential of occurrence in industrial heat transfer systems. Flow instability has the potential to affect the safety of design and operation of heat transfer equipment. Flow instability is therefore undesirable and should be avoided in the design and operation of industrial equipment. Rahman et al. reviewed studies on supercritical water heat transfer with the aim of providing references for SCWR researchers. It was found out that most of the CFD studies and experimental studies were performed with single tube geometry due to the complexity of parallel channel geometry. Because studies performed with parallel channel geometry could provide detailed information to the design of the SCWR core, they called for more studies in parallel channel geometry at supercritical pressures in the future. In order to help understand how flow instability investigations are carried out and also highlight the need to understand flow instability phenomenon and equip the designers and operators of industrial heat transfer equipment with the needed knowledge on flow instability, this study carried out a review of flow instability in parallel channels with water at supercritical pressures.

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Section: Figures 4(a)-(c) Respectively Show Schematic Diagram Of a Pamentioning

confidence: 99%

Section: Experimental Studies Addressing Flow Instability In Parallelmentioning

confidence: 99%

Section: Experimental Studies Addressing Flow Instability In Parallelmentioning

confidence: 99%

Section: Experimental Studies Addressing Flow Instability In Parallelmentioning

confidence: 99%

See 2 more Smart Citations

Flow Instability in Parallel Channels with Water at Supercritical Pressure: A Review

Shitsi¹,

Debrah²,

Agbodemegbe³

et al. 2018

WJET

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“…Both in-phase and out-of-phase Density Wave Oscillations were studied and the results showed that the CANDU SCWR had a larger stable zone for the in-phase mode than the out-of-phase mode, and that for both instability modes, increasing the asymmetric level of power input would make the CANDU SCWR more unstable. A recent experimental investigation on supercritical flow instability of two vertical parallel channels with supercritical water was performed by Zhang et al (2016). Two types of flow oscillations, namely type I (in-phase) and type II (out-of-phase), were identified during the experiment.…”

Section: Instability Studies Of Parallel Channels 22mentioning

confidence: 99%

Numerical Instability Study of Supercritical Water Flowing Upward in Two Heated Parallel Channels

Chatoorgoon

Ormiston

2017

Proceedings of the 20th Pacific Basin Nuclear Conference

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A three dimensional numerical investigation of supercritical water flowing upward in two heated parallel channels was developed using a RANS model in the Computational Fluid Dynamics (CFD) code ANSYS CFX. The standard k- turbulence model with scalable wall functions was adopted throughout this numerical study.The effects of spatial and temporal grid sizes on flow instability were studied first. Then oscillatory instabilities of nine experimental cases were predicted using the CFX code.For comparison purposes, Chatoorgoon"s 1-D non-linear SPORTS code was also used to determine the instability boundary. These new numerical results were compared with the experimental data and previous numerical results by other investigators.Additionally, the effects of changing the outlet plenum volume, the turbulent Prandtl number, the turbulence inlet conditions, the outlet K factor, the maximum iterations per time step in the transient analysis and the order of the transient scheme on the instability thresholds were examined.ii ACKNOWLEDGEMENTS

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A numerical study of natural convection properties of supercritical water (H2O) using Redlich–Kwong equation of state

2019

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In this article, the Crank-Nicolson implicit finite difference method is utilized to obtain the numerical solutions of highly nonlinear coupled partial differential equations (PDEs) for the flow of supercritical fluid (SCF) over a vertical flat plate. Based on the equation of state (EOS) approach, suitable equations are derived to calculate the thermal expansion coefficient (b) values. Redlich-Kwong equation of state (RK-EOS), Peng-Robinson equation of state (PR-EOS), Van der Waals equation of state (VW-EOS) and Virial equation of state (Virial-EOS) are used in this study to evaluate b values. The calculated values of b based on RK-EOS is closer to the experimental values, which shows the greater accuracy of the RK-EOS over PR-EOS, VW-EOS and Virial-EOS models. Numerical simulations are performed for H 2 O in three regions namely subcritical, supercritical and near critical regions. The unsteady velocity, temperature, average heat and momentum transport coefficients for different values of reduced pressure and reduced temperature are discussed based on the numerical results and are shown graphically across the boundary layer.

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Experimental investigations on flow characteristics of two parallel channels in a forced circulation loop with supercritical water

Cited by 29 publications

References 28 publications

Flow Instability in Parallel Channels with Water at Supercritical Pressure: A Review

Flow Instability in Parallel Channels with Water at Supercritical Pressure: A Review

Numerical Instability Study of Supercritical Water Flowing Upward in Two Heated Parallel Channels

A numerical study of natural convection properties of supercritical water (H2O) using Redlich–Kwong equation of state

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