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Frost nucleation and frost growth on hydrophobic and hydrophilic surfaces for heat exchangers fin structures.

Number: pap. 2508

Author(s) : CREMASCHI L., HARGES E., ADANUR B., et al.

Summary

Frost formation decreases the energy efficiency of refrigeration and heat pump systems. This paper presents new experimental data of frost nucleation and frost growth on cold flat fin plates operating in frosting conditions and with air forced convective flow. The growth of droplets, their freezing time, and the subsequent frost growth were directly measured at various surface temperatures and heat fluxes. Mirror finished uncoated Aluminum surface, one hydrophobic, and one hydrophilic surfaces were investigated. Frost thickness data for the aluminum and hydrophilic surfaces were similar, while thickness for the hydrophobic surface was considerably higher. The surface energy characteristics affected the time and the initial thickness of the frost right when the droplets froze on the test plates. The total mass of frost at the end of the frosting period was similar for all the three surfaces. The time-dependent air-side convective heat transfer coefficients for the hydrophobic and hydrophilic surfaces were similar, while that for the aluminum surface was slightly lower.

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Pages: 10

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Details

  • Original title: Frost nucleation and frost growth on hydrophobic and hydrophilic surfaces for heat exchangers fin structures.
  • Record ID : 30024587
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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