Heat Transfer of Supercritical CO<sub>2</sub>Flow in Natural Convection Circulation System

Tokanai, Hideki; Ohtomo, Yukiko; Horiguchi, Hiro; Harada, Eiji; Kuriyama, Masafumi

doi:10.1080/01457630903500924

Cited by 18 publications

(7 citation statements)

References 11 publications

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“…Similar conclusions can be drawn from experimental investigations of NCLs with supercritical media. An increase in mass flow rate with increasing heating rate was first measured by Tokanai et al, [6]. The broader range of results presented in Liu et al [7] also show the previously discussed maximum in the mass flow rate with increasing heating.…”

Section: Introductionsupporting

confidence: 62%

“…Hence, the contributions of the individual terms in dimensional equation ( 6) are further investigated. In order to consider the independent contribution of Q in equation (6), all other terms have to attain constant values when Q is varied. Through variation of the coolant temperature, a constant thermodynamic mean state can be maintained with varying heating rates.…”

Section: Resultsmentioning

confidence: 99%

“…Here, ṁ is assumed to scale with Σ(f i L i ) −1/3 , following equation (6). The value of C fl should be chosen such that it matches one of the values of Σ(f i L i ) within the considered experimental data set.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

The steady behavior of the supercritical carbon dioxide natural circulation loop

Draskic,

Bugeat,

Pecnik

2024

Energy

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Section: Introductionsupporting

confidence: 62%

Section: Resultsmentioning

confidence: 99%

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The steady behavior of the supercritical carbon dioxide natural circulation loop

Draskic,

Bugeat,

Pecnik

2024

Energy

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“…Tokanai et al (2010) combined the numerical and experimental methods to study the natural convection circulation of supercritical carbon dioxide (CO 2 ) in the tube. Computational fluid dynamics (CFD) ANES code was used to study the natural convection and heat transfer of supercritical fluids in a heated horizontal cavity (Artemov and Polyakov, 2013).…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann simulation for natural convection of supercritical CO₂ in an inclined square cavity

Zhu

Gao

et al. 2019

HFF

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Purpose This study aims to show the importance of natural convection of supercritical fluid in an inclined cavity. The heat transfer performance of natural convection can be improved. Design/methodology/approach A model of an inclined cavity was set up to simulate the natural convection of supercritical fluid. The influence of inclined angles (30 to approximately 90°) and pressures (8 to approximately 12 MPa) are analyzed. To ascertain flow and heat transfer of supercritical fluid natural convection, this paper conducts a numerical investigation using the lattice Boltzmann method (LBM), which is proven to be precise and convenient. Findings The results show that the higher heat transfer performance can be obtained with an inclined angle of 30°. It is also presented that the heat transfer performance under pressure of 10 MPa is the best. In addition, common criterion number correlations of average Nusselt number are also fitted. Originality/value These study results can provide a theoretical reference for the study of heat transfer of supercritical fluid natural convection in engineering.

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“…For example, superior solvent characteristics were used in pharmaceutical industry, extraction nature in petrochemical refining, non-flammable and non-toxic characteristics in food processing, higher convection rather than diffusivity nature in chemical separation, and textile dyeing [1]. In recent years, due to several reasons such as low toxicity nature and strict environmental regulations, the research interest on S-CO 2 is increasing in both academic and industrial sectors [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of the Performance Characteristics of a Supercritical CO2 Centrifugal Compressor

Raman

Kim

2018

Computation

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A centrifugal compressor working with supercritical CO 2 (S-CO 2 ) has several advantages over other supercritical and conventional compressors. S-CO 2 is as dense as the liquid CO 2 and becomes difficult to compress. Thus, during the operation, the S-CO 2 centrifugal compressor requires lesser compression work than the gaseous CO 2 . The performance of S-CO 2 compressors is highly varying with tip clearance and vanes in the diffuser. To improve the performance of the S-CO 2 centrifugal compressor, knowledge about the influence of individual components on the performance characteristics is necessary. This present study considers an S-CO 2 compressor designed with traditional engineering design tools based on ideal gas behaviour and tested by SANDIA national laboratory. Three-dimensional, steady, viscous flow through the S-CO 2 compressor was analysed with computational fluid dynamics solver based on the finite volume method. Navier-Stokes equations are solved with K- ω (SST) turbulence model at operating conditions in the supercritical regime. Performance of the impeller, the main component of the centrifugal compressor is compared with the impeller with vaneless diffuser and vaned diffuser configurations. The flow characteristics of the shrouded impeller are also studied to analyse the tip-leakage effect.

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Heat Transfer of Supercritical CO₂Flow in Natural Convection Circulation System

Cited by 18 publications

References 11 publications

The steady behavior of the supercritical carbon dioxide natural circulation loop

The steady behavior of the supercritical carbon dioxide natural circulation loop

Lattice Boltzmann simulation for natural convection of supercritical CO₂ in an inclined square cavity

Computational Analysis of the Performance Characteristics of a Supercritical CO2 Centrifugal Compressor

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Heat Transfer of Supercritical CO2Flow in Natural Convection Circulation System

Cited by 18 publications

References 11 publications

The steady behavior of the supercritical carbon dioxide natural circulation loop

The steady behavior of the supercritical carbon dioxide natural circulation loop

Lattice Boltzmann simulation for natural convection of supercritical CO2 in an inclined square cavity

Computational Analysis of the Performance Characteristics of a Supercritical CO2 Centrifugal Compressor

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Product

Resources

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Heat Transfer of Supercritical CO₂Flow in Natural Convection Circulation System

Lattice Boltzmann simulation for natural convection of supercritical CO₂ in an inclined square cavity