Two-phase frictional pressure drop in horizontal micro-scale channels: Experimental data analysis and prediction method development

Sempértegui-Tapia, Daniel Felipe; Ribatski, Gherhardt

doi:10.1016/j.ijrefrig.2017.03.024

Cited by 55 publications

(14 citation statements)

References 41 publications

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“…Little data exists for the two-phase pressure drop of natural refrigerants compared to data for HFCs as mentioned in [1]. What is more, even less data exists that takes into account the hysteresis effect on vaporization delay.…”

Section: Resultsmentioning

confidence: 99%

“…Against this background, many researchers focus on the homogenous flow approach with the major challenge to find an appropriate and predictive correlation for the two-phase viscosity. Sempértegui-Tapia and Ribatski [1] criticize that experiments are often inaccurately performed and documented which makes it difficult to identify an appropriate flow model that follows the experimental data. Respectively, there is a lack of precise information concerning the experimental apparatus and/or geometrical parameters of the capillary.…”

Section: Introductionmentioning

confidence: 99%

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Experiments of the Pressure Drop of Propane Considering Hysteresis and Metastability

Gabrisch¹,

Repke²

2019

Proceedings of the 4th World Congress on Momentum, Heat and Mass Transfer

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There is a broad database on two-phase pressure drop of refrigerants through capillaries in literature, since capillaries are a commonly used throttle device in heat pumps. However, the following essential aspects are insufficiently included: extensive data on natural refrigerants, precise capillary specifications, and the consideration of the hysteresis effect on vaporization delay and the metastable region of the flow, respectively. This paper contributes to a more comprehensive database of the two-phase pressure drop of propane with respect to the hysteresis curves that occur in the capillary. The present study investigates a copper capillary tube with 1 m length and 1.1 mm inner diameter. The manufacturer's specification of the capillary is refined to enable a more predictive numerical analysis of the pressure drop. Experimental data comprises a mass flux of 4300 kg/m²s, a constant inlet pressure of 15 bar and subcooling temperatures ranging from 5 °C to 9 °C. The presence and magnitude of the hysteresis becomes evident in the measurements: starting from a higher inlet temperature and increasing the subcooling temperature results in a higher pressure drop (~5 %) than starting from a lower inlet temperature and decreasing the subcooling temperature. Additionally, experimental results show that a metastable region must be present that leads to a delay in vaporization and thereby affects the measured pressure drop.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experiments of the Pressure Drop of Propane Considering Hysteresis and Metastability

Gabrisch¹,

Repke²

2019

Proceedings of the 4th World Congress on Momentum, Heat and Mass Transfer

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“…For two-phase flow, the total pressure drop is estimated from the sum of the contributions of frictional and momentum parcels. The frictional pressure drop parcel is estimated according to the method of Sempertegui-Tápia and Ribatski [1] for small-diameter channels:…”

Section: Data Reductionproceduresmentioning

confidence: 99%

“…Flow boiling phenomena in microscale channels have received a lot of attention from academia and industry in the last 2 decades [1] due to its potential of being used in a wide range of industrial applications involving thermal management of high heat fluxes under confined conditions such as: microheat exchangers, electronic components, renewable energy, high-concentration photovoltaics (HCPV), mechanical, chemical, aerospace, automotive and medical industries [2][3][4][5]. More recently, Cheng and Xia [3] identified flow boiling under confined conditions as one of the most important research subjects in the heat transfer field.…”

Section: Introductionmentioning

confidence: 99%

Flow boiling heat transfer of R134a in a 500 µm ID tube

Filho

Aguiar

Ribatski

2020

J Braz. Soc. Mech. Sci. Eng.

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The present paper presents experimental results for the heat transfer coefficient during flow boiling of refrigerant R134a in a circular channel with internal diameter of 500 µm. The experimental database covers mass velocities ranging from 200 to 800 kg/m 2 s, heat fluxes up to 100 kW/m 2 and vapor qualities from 0.02 to 0.75 for a saturation temperature of 40 °C. The experimental data were parametrically analyzed and the effects of the experimental parameters (heat flux, mass velocity and vapor quality) identified. Additionally, images of two-phase flow were obtained through a high-speed camera and employed to identify the flow patterns. A flow pattern map was built and compared to prediction methods from the literature. In general, the heat transfer coefficient increased with increasing mass velocity and heat flux. The experimental data were compared against seven flow boiling predictive methods from the literature.

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“…One of the recently proposed model for prediction pressure drop is due to Sempertegui-Tapia et al [10] correlation. Ribatski [11] highlighted the problem connecting with differences among data from independent laboratories that can be related to several following aspects: different surface roughness, channel dimensions uncertainties, channel obstructions, inappropriate data reduction procedures, and presence of thermal instabilities [10]. It can be the reason why most of available in the literature empirical correlations give different results as compared to the results obtained experimentally.…”

Section: Introductionmentioning

confidence: 99%

An improved method for flow boiling heat transfer with account of the reduced pressure effect

Jakubowska

Mikielewicz

2019

Therm sci

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Original scientific paper https://doi.org/10.2298/TSCI19S4261JIn the paper are presented the results using the authors own model to predict heat transfer coefficient during flow boiling. The model has been tested against a large selection of experimental data to investigate the sensitivity of the in-house developed model. In the work are presented the results of calculations obtained using the semi-empirical model on selected experimental flow boiling data of the refrigerants: R134a, R1234yf, R600a, R290, NH 3 , CO 2 , R236fa, R245fa, R152a, and HFE7000. In the present study, particular attention was focused on the influence of reduced pressure on the predictions of the theoretical model. The main purpose of this paper is to show the effect of the reduced pressure on the predictions of heat transfer during flow boiling.

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Two-phase frictional pressure drop in horizontal micro-scale channels: Experimental data analysis and prediction method development

Cited by 55 publications

References 41 publications

Experiments of the Pressure Drop of Propane Considering Hysteresis and Metastability

Experiments of the Pressure Drop of Propane Considering Hysteresis and Metastability

Flow boiling heat transfer of R134a in a 500 µm ID tube

An improved method for flow boiling heat transfer with account of the reduced pressure effect

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