Two-phase frictional pressure gradient of R236ea, R134a and R410A inside multi-port mini-channels

Cavallini, Alberto; Col, Davide Del; Doretti, Luca; Matkovič, Marko; Rossetto, Luisa; Zilio, Claudio

doi:10.1016/j.expthermflusci.2005.03.012

Cited by 120 publications

(37 citation statements)

References 17 publications

(20 reference statements)

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“…12c. Cavallini et al [27] observed similar predicting trends when they compared their experimental data of three refrigerants (R236ea, R134a, R410A) in multiport mini channels with Tran et al [26] correlation.…”

Section: Comparison With Micro Scale Correlationsmentioning

confidence: 60%

Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Maqbool

Palm

Khodabandeh

2012

International Journal of Thermal Sciences

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a b s t r a c tTwo phase pressure drops were measured for ammonia at a wide range of test conditions in two sizes of vertical mini channels. The test sections were made of stainless steel (AISI 316) tubes with internal diameter of 1.70 mm and 1.224 mm and a uniformly heated length of 245 mm. Experiments were conducted at three saturation temperatures of 23 C, 33 C and 43 C, the heat flux ranging from 15 to 355 kW/m 2 and the mass flux ranging from 100 to 500 kg/m 2 s. The effect of the heat flux, the mass flux, the vapour quality, the saturation temperature and the internal diameter on the two phase pressure drop are presented in this article. Some generalized two phase pressure drop correlations suggested for macro and micro scale channels are examined by comparing them with our experimental data. None of the examined correlations agreed well with the test data. A new correlation (modified form of Tran et al. correlation) is proposed which is able to predict the experimental data with MAD of 16% and 86% of the data is within AE30% range.

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Section: Comparison With Micro Scale Correlationsmentioning

confidence: 60%

Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Maqbool

Palm

Khodabandeh

2012

International Journal of Thermal Sciences

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“…Also, their other study [70] explained R410A pressure drop was significantly lower than R134a ones under the same operating conditions. This difference is mainly due to the different values of the vapor phase density of the two fluids: at 40°C saturation temperature, the R410A vapor density is more than double as compared to R134a.…”

Section: Void Fractionmentioning

confidence: 79%

Condensation pressure drop of R22, R134a and R410A in a single circular microtube

Son

2012

Heat Mass Transfer

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The condensation pressure drop characteristics for pure refrigerants R22, R134a, and a binary refrigerant mixture R410A without lubricating oil in a single circular microtube were investigated experimentally. The test section consists of 1,220 mm length with horizontal copper tube of 3.38 mm outer diameter and 1.77 mm inner diameter. The experiments were conducted at refrigerant mass flux of 450-1,050 kg/m 2 s, and saturation temperature of 40°C. The main experimental results showed that the condensation pressure drop of R134a is higher than that of R22 and R410A for the same mass flux. The experimental data were compared against 14 two-phase pressure drop correlations. A new pressure drop model that is based on a superposition model for refrigerants condensing in the single circular tube is presented.

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“…The results indicate that pressure drop along the test section is very small and two-phase CO2 flow exhibits a higher heat transfer coefficient than that of the single-phase liquid or vapor flow. Cavallini et al (2005) demonstrated the two phase frictional pressure gradient of R236ea, R134a and R410A inside multi-port mini-channels. The results presented cover a wide range of the reduced pressure, from 0.1 up to 0.5.…”

Section: Introductionmentioning

confidence: 98%

Convective Heat Transfer Characteristics of Single Phase Liquid in Multiport Minichannel Tube: Experiment and CFD Simulation

Chien

Mohd‐Ghazali

et al. 2015

Energy Procedia

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This study demonstrated the single phase boiling heat transfer of water in horizontal multiport minichannels. The experimental data were observed in aluminum tube of 7.9 x 2.5 mm (width x high) with 7 rectangular channels and the length of 500 mm, the Reynolds number of 1400 -4200, and heat fluxes of 3 -6 kWm -2 . The effects of mass fluxes and heat fluxes on heat transfer coefficient were analyzed. The transition of flow regime was observed at the Reynolds number of 3000. Finally, the CFD simulation was also set up and compared with the experimental data. The results showed that the CFD simulation was in well agreement with the experimental ones.

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Two-phase frictional pressure gradient of R236ea, R134a and R410A inside multi-port mini-channels

Cited by 120 publications

References 17 publications

Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Condensation pressure drop of R22, R134a and R410A in a single circular microtube

Convective Heat Transfer Characteristics of Single Phase Liquid in Multiport Minichannel Tube: Experiment and CFD Simulation

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