Evaporative heat transfer and pressure drop of R410A in microchannels

Rin Yun, Jae Hyeok Heo, Yong Chan Kim

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

Convective boiling heat transfer coefficients and two-phase pressure drops of R410A are investigated in rectangular microchannels whose hydraulic diameters are 1.36 and 1.44 mm. The mass flux was varied from 200 to 400 kg/m2s, heat flux from 10 to 20 kW/m2, as the saturation temperatures were maintained at 0, 5 and 10°C. A direct heating method was used to provide heat flux into the fluid. The boiling heat transfer coefficients of R410A in the microchannels were much different with those in single tubes, and the test conditions only slightly affected the heat transfer coefficients before dryout vapor quality. The present heat transfer correlation for microchannels, which was developed by introducing non-dimensional parameters of Bo, Wel, and Rel used in the existing heat transfer correlations for large diameter tubes, yielded satisfactory predictions of the present data with a mean deviation of 18%. The pressure drops of R410A in the microchannels showed very similar trends with those in large diameter tubes. The existing two-phase pressure drop correlations for R410A in microchannels satisfactorily predicted the present data.

Original languageEnglish
Pages (from-to)92-100
Number of pages9
JournalInternational Journal of Refrigeration
Volume29
Issue number1
DOIs
Publication statusPublished - 2006 Jan 1

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heat transfer coefficient
Microchannels
heat transfer
Pressure drop
Hot Temperature
Heat transfer
boiling
Pressure
Heat transfer coefficients
heat
Boiling liquids
Heat flux
vapors
fluid mechanics
heat treatment
prediction
Mass transfer
Vapors
Hydraulics
temperature

Keywords

  • Evaporation
  • Heat transfer
  • Micro-channel
  • Pressure drop
  • R410A

ASJC Scopus subject areas

  • Food Science
  • Mechanical Engineering

Cite this

Evaporative heat transfer and pressure drop of R410A in microchannels. / Yun, Rin; Hyeok Heo, Jae; Kim, Yong Chan.

In: International Journal of Refrigeration, Vol. 29, No. 1, 01.01.2006, p. 92-100.

Research output: Contribution to journalArticle

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AB - Convective boiling heat transfer coefficients and two-phase pressure drops of R410A are investigated in rectangular microchannels whose hydraulic diameters are 1.36 and 1.44 mm. The mass flux was varied from 200 to 400 kg/m2s, heat flux from 10 to 20 kW/m2, as the saturation temperatures were maintained at 0, 5 and 10°C. A direct heating method was used to provide heat flux into the fluid. The boiling heat transfer coefficients of R410A in the microchannels were much different with those in single tubes, and the test conditions only slightly affected the heat transfer coefficients before dryout vapor quality. The present heat transfer correlation for microchannels, which was developed by introducing non-dimensional parameters of Bo, Wel, and Rel used in the existing heat transfer correlations for large diameter tubes, yielded satisfactory predictions of the present data with a mean deviation of 18%. The pressure drops of R410A in the microchannels showed very similar trends with those in large diameter tubes. The existing two-phase pressure drop correlations for R410A in microchannels satisfactorily predicted the present data.

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