A brief review on convection heat transfer of fluids at supercritical pressures in tubes and the recent progress

Huang, Dan; Wu, Zan; Sundén, Bengt; Li, Wei

doi:10.1016/j.apenergy.2015.10.080

Cited by 234 publications

(56 citation statements)

References 98 publications

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“…It has a critical temperature near the ambient temperature, critical pressure leading to acceptable operative conditions, very high power density leading to a turbine size 10 times smaller than its equivalent steam and "tunable" properties than can be changed with slight modifications on pressure and/or temperature as shown on Fig. 1 [11]. Another interesting feature that favours sCO 2 as a working fluid is that its specific heat capacity is a factor of 4e5 times greater at ambient temperature than at high temperature.…”

Section: Introductionmentioning

confidence: 98%

Optimization of a recompression supercritical carbon dioxide cycle for an innovative central receiver solar power plant

Reyes-Belmonte

Sebastián

Romero

et al. 2016

Energy

167

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Section: Introductionmentioning

confidence: 98%

Optimization of a recompression supercritical carbon dioxide cycle for an innovative central receiver solar power plant

Reyes-Belmonte

Sebastián

Romero

et al. 2016

Energy

167

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“…An unusual physical variation near the critical or pseudo‐critical temperature will appear, and the heat transfer characteristics at the critical or pseudo‐critical condition are different from those at subcritical condition . The phenomenon of heat transfer enhancement or deterioration is usually found in this process . Therefore, more investigations on heat transfer in a vertical or a horizontal tube have been studied by a large number of scholars, and such work has never stopped .…”

Section: Introductionmentioning

confidence: 99%

Turbulent heat transfer characteristics of supercritical n ‐decane in a vertical tube under various operating pressures

Sun

Sundén

et al. 2019

Int J Energy Res

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Summary To explore the effect of the operating pressure on the flow and thermal characteristics in a vertical tube with supercritical n‐decane, the inner wall temperature along the streamwise direction, the applicability of empirical correlations and buoyancy criteria are studied firstly. The mechanisms in views of density distribution, velocity field, turbulence intensity, the thickness of the thermal boundary layer, and secondary flow are then analyzed. It is observed that the buoyancy is helpful for the phenomenon of heat transfer deterioration at lower operating pressures but higher operating pressures can diminish this tendency. According to this reason, the empirical correlation proposed by Bae and Kim is suitable for the higher operating pressures but cannot well predict the occurrence of heat transfer deterioration. However, it can be evaluated by the buoyancy criterion Gr/Re2 = 0.01 qualitatively. The decrease of turbulence intensity, the thickened thermal boundary layer, and secondary flow generation make contributions to the heat transfer deterioration in particular. Similarly, this situation can be diminished and even removed by the higher operating pressures.

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“…A previous study [36] pointed out that the SST k-w turbulent model can obtain a better result than that of other turbulent models for supercritical vertical flow. Therefore, in the present paper, the numerical simulation was implemented based on this model, whereas the verification of the model is shown in Figure 15.…”

Section: Numerical Simulation Of Mixed Convectionmentioning

confidence: 99%

“…During this evolution, buoyancy played an important role in heat transfer at supercritical pressures. A number of research papers [35][36][37][38] discussed the effect of buoyancy on heat transfer in supercritical fluids.…”

Section: Introductionmentioning

confidence: 99%

“…evolution, buoyancy played an important role in heat transfer at supercritical pressures. A number of research papers [35][36][37][38] discussed the effect of buoyancy on heat transfer in supercritical fluids. From the above literature review, it can be observed that mixed convection heat transfer in supercritical CO2, flowing vertically in a uniformly-heated circular tube at low mass flux, has not received much research attention.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigation of Convective Heat Transfer of Supercritical Carbon Dioxide at Low Mass Fluxes

Lei

Zhang

et al. 2017

Applied Sciences

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Featured Application: Supercritical carbon dioxide Brayton cycle, geothermal system, nuclear reactor.Abstract: Significant differences in the heat transfer behaviors of supercritical carbon dioxide in a heated channel have been observed at different mass fluxes. At low mass fluxes, a unique heat transfer characteristic is accompanied by a monotonously smooth temperature variation without any temperature peak, even though the ratio of heat flux to mass flux (q/G) is high. In this study, experimental and numerical investigations explore the hidden mechanism of the peculiar heat transfer characteristics of supercritical carbon dioxide at low mass fluxes in vertically upward tubes with inside diameters (ID) of 5 mm. The range of operating conditions examined within the study include a mass flux (G) between 0-200 kg/m 2 s, and a heat flux (q) of up to 120 kW/m 2 . The parametric effects within these experimental conditions were analyzed on the basis of the obtained heat transfer data. Furthermore, a qualitative modeling force analysis and quantitative numerical simulation of vertical flow at low mass flux reveal the heat transfer mechanism for these temperature profiles. In addition, the distribution of flow parameters and thermo-physical properties (such as shear stress, density, and specific heat) in the near-wall region were also studied. It is found that the heat transfer behavior of supercritical CO 2 at low mass flux is similar to "film boiling" at subcritical pressure, where "vapor-like" fluid occupies the sublayer region. Due to reduced buoyancy, the fluid does not cause enough mixing/instability to bring it to the bulk flow.

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A brief review on convection heat transfer of fluids at supercritical pressures in tubes and the recent progress

Cited by 234 publications

References 98 publications

Optimization of a recompression supercritical carbon dioxide cycle for an innovative central receiver solar power plant

Optimization of a recompression supercritical carbon dioxide cycle for an innovative central receiver solar power plant

Turbulent heat transfer characteristics of supercritical n ‐decane in a vertical tube under various operating pressures

Experimental and Numerical Investigation of Convective Heat Transfer of Supercritical Carbon Dioxide at Low Mass Fluxes

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