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Performance of oil-separator adopting nature-inspired surface

International Journal of Precision Engineering and Manufacturing volume 16, pages 2205–2211 (2015)Cite this article

Abstract

In order to improve a refrigeration system’s energy efficiency, the separation efficiency of its oil separator should be improved. To do so, we turned to nature for inspiration. A Namib Desert beetle collects water in fog by using its skin, which combines hydrophilic and hydrophobic surfaces. Inspired by nature’s design, we applied a surface with oleophilic and oleophobic patterns to an oil separator used in a refrigeration system. In order to make the oil separator, an appropriate design was established using computational fluid dynamics. A cyclone-type oil separator was produced with an oleophobic-treated surface on its lower cup. The efficiency of the treated surface of this oil separator was tested with an open-type experimental setup using an oil mist generator. To obtain conditions similar to those of a refrigeration system in the open-type experimental setup, the oil particle diameter and working fluid pressure were set to yield a Stokes number similar to that of oil particles in the oil separator of the refrigeration system. The oil separator with the treated oleophilic–oleophobic surface improved its oil separation efficiency by 1.67% and its pressure drop by 2.48% compared to a conventional cyclone-type oil separator.

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Abbreviations

D :

Cyclone diameter [m]

d p :

diameter [m]

Q d :

Amount of oil remaining in the oil mist generator [mL]

Q t :

Amount of oil trapped in the oil separator [mL]

Q :

Flow rate of gas and oil [m/s]

Stk :

Stokes number

x ef :

Oil separation efficiency

µ g :

Viscosity of gas [kg/ms]

ρ g :

Density of gas [kg/m]

ρ p :

Density of particle [kg/m]

References

  1. Nørgaard, T. and Dacke, M., “Fog-Basking Behaviour and Water Collection Efficiency in Namib Desert Darkling Beetles,” Frontiers in Zoology, Vol. 7, No. 23, pp. 23–30, 2010.

    Article  Google Scholar 

  2. Barthwal, S., Kim, Y. S., and Lim, S.-H., “Superhydrophobic and Superoleophobic Copper Plate Fabrication using Alkaline Solution Assisted Surface Oxidation Methods,” Int. J. Precis. Eng. Manuf., Vol. 13, No. 8, pp. 1311–1315, 2012.

    Article  Google Scholar 

  3. Neto, M. A. M. and Barbosa, J. R., “A Departure-Function Approach to Calculate Thermodynamic Properties of Refrigerant-Oil Mixtures,” International Journal of Refrigeration, Vol. 36, No. 3, pp. 972–979, 2013.

    Article  Google Scholar 

  4. Biancardi, F. R., Michels, H. H., Sienel, T. H., and Pandy, D. R., “Study of Lubricant Circulation in HVAC Systems,” United Technologies Research Center, ARTI MCLR Proiect, No. 665-53100, 1996.

    Google Scholar 

  5. Huang, X., Ding, G., Hu, H., Zhu, Y., Gao, Y., and Deng, B., “Flow Condensation Pressure Drop Characteristics of R410A-Oil Mixture Inside Small Diameter Horizontal Microfin Tubes,” International Journal of Refrigeration, Vol. 33, No. 7, pp. 1356–1369, 2010.

    Article  Google Scholar 

  6. Kang, B. H., Kim, K. J., and Lee, S. K., “An Experimental Study on Oil Separation Characteristics of CO2/PAG Oil Mixture in an Oil Separator,” International Journal of Air-Conditioning and Refrigeration, Vol. 17, No. 3, pp. 88–93, 2009.

    Google Scholar 

  7. Cho, Y.-S., Lee, S.-W., Woo, K.-S., Yoon, Y.-B., Park, Y.-J., Lee, D.-Y., Kim, H.-C., and Na, B.-C., “A Numerical Analysis of Flow Characteristics and Oil Separation Performance for Cyclone Oil Separator Designs,” Transactions of the Korean Society of Automotive Engineers, Vol. 16, No. 5, pp. 22–28, 2008.

    Google Scholar 

  8. Shi, L. and Bayless, D. J., “Comparison of Boundary Conditions for Predicting the Collection Efficiency of Cyclones,” Powder Technology, Vol. 173, No. 1, pp. 29–37, 2007.

    Article  Google Scholar 

  9. Rhodes, M. J., “Introduction to Particle Technology,” John Wiley & Sons, pp. 176–191, 2008.

    Book  Google Scholar 

  10. Shin, H. S. and Kim, Y. J., “Oil Behaviors in Oil Separator with Various Discharge of Compressor Oil,” Proc. of the KSME Fluid Eng. Division Spring Annual Meeting, pp. 28–29, 2010.

    Google Scholar 

  11. Kang, W. M., Kim, A. R., Lee, D. Y., and Ko, H. S., “A Study on Cyclone Flow Inside Oil Separator,” Proc. of the KSME Fluid Eng Division Spring Annual Meeting, pp. 330–331, 2011.

    Google Scholar 

  12. Lebreton, J.-M., Vuillame, L., Morvan, E., and Lottin, O., “Oil Concentration Measurement in Saturated Liquid Refrigerant Flowing Inside a Refrigeration Machine,” International Journal of Applied Thermodynamics, Vol. 4, No. 1, pp. 53–60, 2001.

    Google Scholar 

  13. Kim, J., Byun, D., and Ko, H., “Experimental Study on Slip Flows in Superhydrophobic Microchannel,” Proc. of the Korean Society of Visualization Division Fall Meeting, pp. 84–87, 2007.

    Google Scholar 

  14. Park, C. Y., Bae, S. I., Lee, S. M., Ko, J. S., and Chung, K. H., “Friction Drag Reduction using Microstructured Surfaces,” J. Korean Soc. Precis. Eng., Vol. 26, No. 12, pp. 117–122, 2009.

    Google Scholar 

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Authors and Affiliations

  1. School of Mechanical Systems Engineering, Kookmin University, 77, Jeongneung-ro, Seongbuk-gu, Seoul, 136-702, South Korea

    Joon Ahn & Si Hyung Lim

  2. Department of Mechanical Engineering, Graduate School, Kookmin University, 77, Jeongneung-ro, Seongbuk-gu, Seoul, 136-702, South Korea

    Seongil Jang

Authors
  1. Seongil Jang
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  2. Joon Ahn
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  3. Si Hyung Lim
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Correspondence to Joon Ahn or Si Hyung Lim.

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Jang, S., Ahn, J. & Lim, S.H. Performance of oil-separator adopting nature-inspired surface. Int. J. Precis. Eng. Manuf. 16, 2205–2211 (2015). https://doi.org/10.1007/s12541-015-0284-x

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  • DOI: https://doi.org/10.1007/s12541-015-0284-x

Keywords

  • Oil separator
  • Nature-inspired surface
  • Refrigeration system