Experimental investigations on the boiling heat transfer of horizontal flow in the near-critical region

Lei, Xianliang; Zhang, Weiqiang; Zhang, Jun; Dinh, Truc-Nam; Li, Huixiong

doi:10.1016/j.ijheatmasstransfer.2018.04.043

Cited by 16 publications

(7 citation statements)

References 22 publications

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“…When a fluid of two or more components approaches its critical locus, small changes in temperature, pressure, or composition have a large impact on fluid density, and multiple-phase interfaces may appear. 1,2 This will affect the heat transfer and flow mechanisms, and it is more complex than for single-component fluids approaching the critical point. 3,4 One notable example is the retrograde phenomenon, 5 which is the phenomenon of liquid condensation (or vice versa) in a multicomponent system during isothermal depressurization or isobaric heating.…”

Section: Introductionmentioning

confidence: 99%

“…Critical parameters (critical pressure, critical molar volume, critical temperature, and composition) in multicomponent mixtures have significant implications in various industries such as transcritical cycles. When a fluid of two or more components approaches its critical locus, small changes in temperature, pressure, or composition have a large impact on fluid density, and multiple-phase interfaces may appear. , This will affect the heat transfer and flow mechanisms, and it is more complex than for single-component fluids approaching the critical point. , One notable example is the retrograde phenomenon, which is the phenomenon of liquid condensation (or vice versa) in a multicomponent system during isothermal depressurization or isobaric heating. By accurately measuring the critical locus, this phenomenon can be effectively avoided or exploited for thermodynamic design.…”

Section: Introductionmentioning

confidence: 99%

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A New Fast Estimation Method for Critical Pressure and Critical Temperature of Binary Mixture Based on the Modified Redlich–Kister Method

Tang,

Yao,

Dong

et al. 2024

Ind. Eng. Chem. Res.

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The vapor–liquid critical parameters of mixtures are important in the establishment of equations of state and mixing rules to predict thermophysical properties and develop next-generation, low-carbon working fluids. Obtaining critical parameters through experimental measurement is the most efficient and straightforward approach but it is a time-consuming and labor-intensive process, thus necessitating the use of theoretical prediction methods. There is currently no prediction model that can attain the same level of precision as experimental measurements, and the existing models are not easily accessible. In this paper, the nonideal effect of the acentric factor of the mixture and the median deviation term of the critical parameters are introduced into the Redlich–Kister model. The newly developed model surpasses current fast estimation methods in terms of its accurate predictions, minimal adjustable factors, lack of a requirement for critical volume data of pure substances, and consideration of molecular polarity. This new fast estimation model can be applied to hundreds of binary combinations consisting of methane-free alkanes, alkenes, alkynes, alicyclic hydrocarbons, benzene and its derivatives, NH3, CO2, halogenated hydrocarbons, N2O, Kr, Xe, sulfur compounds, and oxygen-containing organic compounds. The absolute average relative deviation (AARD) of this method in calculating the critical temperature and critical pressure of binary mixtures is 1.21% and 4.22%, based on 4116 critical temperature experimental data points (521 groups of binary mixtures) and 2882 critical pressure experimental data points (342 groups of binary mixtures), respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Fast Estimation Method for Critical Pressure and Critical Temperature of Binary Mixture Based on the Modified Redlich–Kister Method

Tang,

Yao,

Dong

et al. 2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…The generated bubbles are reduced and easily fractured. Meanwhile, the vapour density becomes heavier, potentially leading to assembled vapour blocks [8].…”

Section: Introductionmentioning

confidence: 99%

“…However, it should be taken into account that the thermodynamic and thermokinetic properties of carbon dioxide differ significantly from those of many typical synthetic working fluids (belonging to the HFC group), as well as natural fluids (such as hydrocarbons). Let et al [8] defined the near-critical region as a lower limit pressure equal to 0.85 p cr up to the critical point. Experimental investigations on heat transfer characteristics at supercritical and near-critical pressures are presented by Xu et al [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Flow Boiling Heat Transfer under Near-Critical Pressure for Selected Working Fluids

et al. 2022

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This paper deals with experimental investigations of flow boiling in tubular ducts of selected refrigerants—R134a, R507A, and R600a—under near-critical pressures. Near-critical boiling is characterised by low specific enthalpy of evaporation. The positive effect of this feature is the fact that only a small amount of heat consumed by Organic Rankine Cycles is at a constant temperature. This allows a lower terminal temperature of the heating fluid and more effective utilisation of heat sources, especially of low-grade heat sources. The experimental investigations covered a heat flux density of 0.4 to 10 kW/m2 and a mass velocity of 60 to 200 kg/(m2·s). The results of the experimental data were compared to the modified heat transfer correlation of Gungor and Winterton, which provices the best fit for the obtained experimental data. The maximum heat transfer coefficient occurred at the two-phase quality—approximately 0.4 for all the tested fluids under high pressure conditions—which may be thought of as a characteristic feature of the boiling process under near-critical conditions. A modified Gungor–Winterton correlation improves prediction accuracy, especially under the lowest (up to 3 kW/m2) and highest (over 7 kW/m2) heat flux densities for all the tested fluids.

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“…The meter is widely used in industrial applications in the oil and gas, food and beverage, chemical and pharmaceutical sectors. It also provides reference measurement data in experimental research domains, including combustion engines, heat exchangers, and thermal management [3][4][5][6][7][8][9]. Although CMFM has been called the "almost perfect" flow meter [10], two-phase (gas/liquid) conditions present challenges at two levels.…”

Section: Introductionmentioning

confidence: 99%

Two-phase flow experiments with Coriolis Mass Flow Metering using complex signal processing

Henry

Zhou

et al. 2019

Flow Measurement and Instrumentation

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Two-phase (gas/liquid) flow is common in many industrial applications but its measurement remains challenging for Coriolis mass flow meters (CMFM), especially for high Gas Void Fraction (GVF). In this paper, we present experimental results applying previously developed complex signal processing techniques for tracking the rapidly changing sensor signals generated by two-phase flow. The techniques are implemented in a new System-on-Chip (SOC) prototype transmitter connected to a commercial Coriolis flow tube. Experiments have been carried out over a range of single phase and two-phase (water/air) flows. The signal tracking as well as mass flow rate and density measurement performance is compared with that of a laboratory version of a commercial Coriolis transmitter with two-phase flow capability. The results show that the complex bandpass algorithms, coupled with flowtube control algorithms, reduce the standard deviation of the mass flow measurement by a factor of 3 or more in 50% of the experiments undertaken. For the density measurement, the corresponding reduction in standard deviation is by a factor of 6.

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Experimental investigations on the boiling heat transfer of horizontal flow in the near-critical region

Cited by 16 publications

References 22 publications

A New Fast Estimation Method for Critical Pressure and Critical Temperature of Binary Mixture Based on the Modified Redlich–Kister Method

A New Fast Estimation Method for Critical Pressure and Critical Temperature of Binary Mixture Based on the Modified Redlich–Kister Method

Experimental Investigations of Flow Boiling Heat Transfer under Near-Critical Pressure for Selected Working Fluids

Two-phase flow experiments with Coriolis Mass Flow Metering using complex signal processing

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