Frictional Pressure Drop

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Yifeng Gao - One of the best experts on this subject based on the ideXlab platform.

  • Two-Phase Frictional Pressure Drop Characteristics of R410A-Oil Mixture Flow Condensation inside 4.18 mm and 1.6 mm I.D. Horizontal Smooth Tubes
    HVAC&R Research, 2010
    Co-Authors: Xiangchao Huang, Guoliang Ding, Yifeng Gao, Yu Zhu, Bin Deng
    Abstract:

    Two-phase Frictional Pressure Drop characteristics of R410A-oil mixture flow condensation inside 4.18 mm (0.165 in) and 1.6 mm (0.063 in) I.D. diameter horizontal smooth tubes were investigated experimentally. The experimental condensing temperature is 40°C (104°F), and the nominal oil concentration range is from 0% to 5%. The test results indicate that the presence of oil always decreases the flow condensation Frictional Pressure Drop, and the decrement increases with the nominal oil concentration. The decrements for 4.18 mm (0.165 in.) and 1.6 mm (0.063 in.) are 1%~19.5% and 1.5%~17.4% tubes, respectively. A new correlation for the Frictional Pressure Drop of R410A-oil mixture flow condensation inside smooth tubes is proposed and agrees with 96% of the experimental data within a deviation of −20%~+30%.

  • measurement and correlation of Frictional Pressure Drop of refrigerant based nanofluid flow boiling inside a horizontal smooth tube
    International Journal of Refrigeration-revue Internationale Du Froid, 2009
    Co-Authors: Hao Peng, Guoliang Ding, Weiting Jiang, Yifeng Gao
    Abstract:

    Abstract The objective of this paper is to investigate the effect of nanoparticle on the Frictional Pressure Drop characteristics of refrigerant-based nanofluid flow boiling inside a horizontal smooth tube, and to present a correlation for predicting the Frictional Pressure Drop of refrigerant-based nanofluid. R113 refrigerant and CuO nanoparticle were used for preparing refrigerant-based nanofluid. Experimental conditions include mass fluxes from 100 to 200 kg m−2 s−1, heat fluxes from 3.08 to 6.16 kW m−2, inlet vapor qualities from 0.2 to 0.7, and mass fractions of nanoparticles from 0 to 0.5 wt%. The experimental results show that the Frictional Pressured Drop of refrigerant-based nanofluid increases with the increase of the mass fraction of nanoparticles, and the maximum enhancement of Frictional Pressure Drop is 20.8% under above conditions. A Frictional Pressure Drop correlation for refrigerant-based nanofluid is proposed, and the predictions agree with 92% of the experimental data within the deviation of ±15%.

  • experimental investigation and correlation of two phase Frictional Pressure Drop of r410a oil mixture flow boiling in a 5 mm microfin tube
    International Journal of Refrigeration-revue Internationale Du Froid, 2009
    Co-Authors: Guoliang Ding, Xiangchao Huang, Bin Deng, Yifeng Gao
    Abstract:

    Abstract This study presents experimental two-phase Frictional data for R410A-oil mixture flow boiling in an internal spiral grooved microfin tube with outside diameter of 5 mm. Experimental parameters include the evaporation temperature of 5 °C, the mass flux from 200 to 400 kg m −2  s −1 , the heat flux from 7.46 to 14.92 kW m −2 , the inlet vapor quality from 0.1 to 0.8, and nominal oil concentration from 0 to 5%. The test results show that the Frictional Pressure Drop of R410A initially increases with vapor quality and then decreases, presenting a local maximum in the vapor quality range between 0.7 and 0.8; the Frictional Pressure Drop of R410A–oil mixture increases with the mass flux, the presence of oil enhances two-phase Frictional Pressure Drop, and the effect of oil on Frictional Pressure Drop is more evident at higher vapor qualities where the local oil concentrations are higher. The enhanced factor is always larger than unity and increases with nominal oil concentration at a given vapor quality. The range of the enhanced factor is about 1.0–2.2 at present test conditions. A new correlation to predict the local Frictional Pressure Drop of R410A-oil mixture flow boiling inside the internal spiral grooved microfin tube is developed based on local properties of refrigerant–oil mixture, and the measured local Frictional Pressure Drop is well correlated with the empirical equation proposed by the authors.

Guoliang Ding - One of the best experts on this subject based on the ideXlab platform.

  • Two-Phase Frictional Pressure Drop Characteristics of R410A-Oil Mixture Flow Condensation inside 4.18 mm and 1.6 mm I.D. Horizontal Smooth Tubes
    HVAC&R Research, 2010
    Co-Authors: Xiangchao Huang, Guoliang Ding, Yifeng Gao, Yu Zhu, Bin Deng
    Abstract:

    Two-phase Frictional Pressure Drop characteristics of R410A-oil mixture flow condensation inside 4.18 mm (0.165 in) and 1.6 mm (0.063 in) I.D. diameter horizontal smooth tubes were investigated experimentally. The experimental condensing temperature is 40°C (104°F), and the nominal oil concentration range is from 0% to 5%. The test results indicate that the presence of oil always decreases the flow condensation Frictional Pressure Drop, and the decrement increases with the nominal oil concentration. The decrements for 4.18 mm (0.165 in.) and 1.6 mm (0.063 in.) are 1%~19.5% and 1.5%~17.4% tubes, respectively. A new correlation for the Frictional Pressure Drop of R410A-oil mixture flow condensation inside smooth tubes is proposed and agrees with 96% of the experimental data within a deviation of −20%~+30%.

  • measurement and correlation of Frictional Pressure Drop of refrigerant based nanofluid flow boiling inside a horizontal smooth tube
    International Journal of Refrigeration-revue Internationale Du Froid, 2009
    Co-Authors: Hao Peng, Guoliang Ding, Weiting Jiang, Yifeng Gao
    Abstract:

    Abstract The objective of this paper is to investigate the effect of nanoparticle on the Frictional Pressure Drop characteristics of refrigerant-based nanofluid flow boiling inside a horizontal smooth tube, and to present a correlation for predicting the Frictional Pressure Drop of refrigerant-based nanofluid. R113 refrigerant and CuO nanoparticle were used for preparing refrigerant-based nanofluid. Experimental conditions include mass fluxes from 100 to 200 kg m−2 s−1, heat fluxes from 3.08 to 6.16 kW m−2, inlet vapor qualities from 0.2 to 0.7, and mass fractions of nanoparticles from 0 to 0.5 wt%. The experimental results show that the Frictional Pressured Drop of refrigerant-based nanofluid increases with the increase of the mass fraction of nanoparticles, and the maximum enhancement of Frictional Pressure Drop is 20.8% under above conditions. A Frictional Pressure Drop correlation for refrigerant-based nanofluid is proposed, and the predictions agree with 92% of the experimental data within the deviation of ±15%.

  • experimental investigation and correlation of two phase Frictional Pressure Drop of r410a oil mixture flow boiling in a 5 mm microfin tube
    International Journal of Refrigeration-revue Internationale Du Froid, 2009
    Co-Authors: Guoliang Ding, Xiangchao Huang, Bin Deng, Yifeng Gao
    Abstract:

    Abstract This study presents experimental two-phase Frictional data for R410A-oil mixture flow boiling in an internal spiral grooved microfin tube with outside diameter of 5 mm. Experimental parameters include the evaporation temperature of 5 °C, the mass flux from 200 to 400 kg m −2  s −1 , the heat flux from 7.46 to 14.92 kW m −2 , the inlet vapor quality from 0.1 to 0.8, and nominal oil concentration from 0 to 5%. The test results show that the Frictional Pressure Drop of R410A initially increases with vapor quality and then decreases, presenting a local maximum in the vapor quality range between 0.7 and 0.8; the Frictional Pressure Drop of R410A–oil mixture increases with the mass flux, the presence of oil enhances two-phase Frictional Pressure Drop, and the effect of oil on Frictional Pressure Drop is more evident at higher vapor qualities where the local oil concentrations are higher. The enhanced factor is always larger than unity and increases with nominal oil concentration at a given vapor quality. The range of the enhanced factor is about 1.0–2.2 at present test conditions. A new correlation to predict the local Frictional Pressure Drop of R410A-oil mixture flow boiling inside the internal spiral grooved microfin tube is developed based on local properties of refrigerant–oil mixture, and the measured local Frictional Pressure Drop is well correlated with the empirical equation proposed by the authors.

  • Measurement and Correlation of Frictional Pressure Drop of R-410A/Oil Mixture Flow Boiling in a 7 mm Straight Smooth Tube
    HVAC&R Research, 2008
    Co-Authors: Guoliang Ding, Wei Wenjian, Zhence Wang, Kaijian Wang
    Abstract:

    Two-phase Frictional Pressure Drop characteristics of an R-410A/oil mixture flow boiling inside a straight, smooth tube with an outside diameter of 7.0 mm were investigated experimentally. Experimental parameters include an evaporation temperature of 5°C, mass fluxes from 200 to 400 kg/(m2·s), heat fluxes from 7.56 to 15.12 kW/m2, inlet vapor qualities from 0.2 to 0.7, and nominal oil concentrations from 0% to 5%. The test results show that Frictional Pressure Drop of an R-410A/oil mixture increases with the mass flux, the presence of oil enhances two-phase Frictional Pressure Drop, and the effect of oil on Frictional Pressure Drop is found to be more evident at higher vapor qualities where the local oil concentrations are higher. A new correlation to predict the local Frictional Pressure Drop of an R-410A/oil mixture flow boiling inside a straight, smooth tube is developed based on the local properties of the refrigerant/oil mixture, and it agrees with 92% of the experimental data within a deviation of ±15%.

  • measurement and correlation of Frictional Pressure Drop of r 410a oil mixture flow boiling in a 7 mm straight smooth tube
    Hvac&r Research, 2008
    Co-Authors: Guoliang Ding, Zhence Wang, Wenjian Wei, Kaijian Wang
    Abstract:

    Two-phase Frictional Pressure Drop characteristics of an R-410A/oil mixture flow boiling inside a straight, smooth tube with an outside diameter of 7.0 mm were investigated experimentally. Experimental parameters include an evaporation temperature of 5°C, mass fluxes from 200 to 400 kg/(m2·s), heat fluxes from 7.56 to 15.12 kW/m2, inlet vapor qualities from 0.2 to 0.7, and nominal oil concentrations from 0% to 5%. The test results show that Frictional Pressure Drop of an R-410A/oil mixture increases with the mass flux, the presence of oil enhances two-phase Frictional Pressure Drop, and the effect of oil on Frictional Pressure Drop is found to be more evident at higher vapor qualities where the local oil concentrations are higher. A new correlation to predict the local Frictional Pressure Drop of an R-410A/oil mixture flow boiling inside a straight, smooth tube is developed based on the local properties of the refrigerant/oil mixture, and it agrees with 92% of the experimental data within a deviation of ±15%.

Asif Afzal - One of the best experts on this subject based on the ideXlab platform.

Irfan Anjum Badruddin - One of the best experts on this subject based on the ideXlab platform.

M. A. Mujtaba - One of the best experts on this subject based on the ideXlab platform.

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