Experimental investigation of buoyancy effects on local heat transfer of supercritical pressure CO2 in horizontal semicircular tube

Park, Joo Hyun; Kwon, Jin Gyu; Kim, Moo Hwan; Eun, Jae; Jo, HangJin

doi:10.1016/j.ijheatmasstransfer.2020.120496

Cited by 32 publications

(2 citation statements)

References 23 publications

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“…With the increase of heat flux, pressure loss decreases, and the change of heat transfer coefficient is determined by the overall temperature and cooling heat flux [83]. The effects of temperature stratification and buoyancy lead to differences in heat transfer deterioration, and the deterioration of top region of channel is greater [169].…”

Section: Supercritical Carbon Dioxide (S-co 2 )mentioning

confidence: 99%

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Liao

Zhang

et al. 2021

Energies

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Heat exchangers play an important role in power, the chemical industry, petroleum, food and many other industrial productions, while compact heat exchangers are more favored in industrial applications due to their high thermal efficiency and small size. This paper summarizes the research status of different types of compact heat exchangers, especially the research results of heat transfer and pressure drop of printed circuit heat exchangers, so that researchers can have an overall understanding of the development of compact heat exchangers and get the required information quickly. In addition, this paper summarizes and analyzes several main working fluids selected in compact heat exchangers, and puts forward some discussions and suggestions on the selection of working fluids. Finally, according to the existing published literature, the performance evaluation indexes of compact heat exchangers are summarized and compared, which is convenient for developers and researchers to better grasp the design direction.

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Section: Supercritical Carbon Dioxide (S-co 2 )mentioning

confidence: 99%

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Liao

Zhang

et al. 2021

Energies

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show abstract

“…From the Brayton cycle, it can be seen that increasing the temperature at the turbine inlet can effectively improve the thermal efficiency of the engine. 2,3 However, increasing the temperature will worsen the working environment of high-temperature components such as the turbine, which will result in poorer engine reliability and shorter working life. To ensure the reliable operation of turbine components, in addition to increasing the temperature resistance limit of the blade material, another important way is to cool the high-temperature blades more efficiently through advanced cooling technology.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-swirl nozzle closure modes on unsteady flow and heat transfer characteristics in a pre-swirl system of aero-engine

Liu

Lei

Lin

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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The pre-swirl system is of great importance for temperature drop and cooling air supply. This study aims to investigate the influencing mechanism of heat transfer, nonuniform thermodynamic characteristics, and cooling air supply sensitivity in a pre-swirl system by the application of the flow control method of the pre-swirl nozzle. A novel test rig was proposed to actively control the supplied cooling air mass flow rate by three adjustable pre-swirl nozzles. Then, the transient problem of the pre-swirl system was numerically conducted by comparison with 60°, 120°, and 180° rotating disk cavity cases, which were verified with the experiment results. Results show that the partial nozzle closure will aggravate the fluctuation of air supply mass flow rate and temperature. When three parts of nozzles are closed evenly at 120° in the circumferential direction, the maximum value of the nonuniformity coefficient of air supply mass flow rate changes to 3.1% and that of temperature changes to 0.25%. When six parts of nozzles are closed evenly at 60° in the circumferential direction, the maximum nonuniformity coefficient of air supply mass flow rate changes to 1.4% and that of temperature changes to 0.20%. However, different partial nozzle closure modes have little effect on the average air supply parameters. Closing 14.3% of the nozzle area will reduce the air supply mass flow rate by 9.9% and the average air supply temperature by about 1 K.

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Study on flow and heat transfer characteristics of supercritical CO2 inside horizontal tube under ocean rolling condition

Shao

Lü

et al. 2023

Annals of Nuclear Energy

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Experimental investigation of buoyancy effects on local heat transfer of supercritical pressure CO2 in horizontal semicircular tube

Cited by 32 publications

References 23 publications

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Effect of pre-swirl nozzle closure modes on unsteady flow and heat transfer characteristics in a pre-swirl system of aero-engine

Study on flow and heat transfer characteristics of supercritical CO2 inside horizontal tube under ocean rolling condition

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