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<p>This study examined the effects of vapor quality and mass flux on the frictional pressure drop and heat transfer coefficient during condensation of R-32 in microchannel heat exchangers with different hydraulic diameters. Both parameters increased with increasing mass flux and vapor quality due to enhanced flow velocity and interfacial shear. The smaller hydraulic diameter channel showed significantly higher pressure drop and moderately higher heat transfer coefficients, indicating that hydraulic diameter has a stronger influence on pressure loss than on heat transfer. Existing correlations predicted frictional pressure drop reasonably well but showed limited accuracy for heat transfer coefficient under high mass flux microchannel conditions. Therefore, a modified correlation was proposed by refining the vapor–liquid interaction term, resulting in improved predictive performance within the investigated range. The findings provide guidance for the design and analysis of microchannel heat exchangers operating at high mass flux conditions.</p>

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Effects of hydraulic diameter on condensation heat transfer and frictional pressure drop of R-32 in microchannels

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Jinyeong Seo,
  • Beomjun Kim,
  • Dongchan Lee

摘要

This study examined the effects of vapor quality and mass flux on the frictional pressure drop and heat transfer coefficient during condensation of R-32 in microchannel heat exchangers with different hydraulic diameters. Both parameters increased with increasing mass flux and vapor quality due to enhanced flow velocity and interfacial shear. The smaller hydraulic diameter channel showed significantly higher pressure drop and moderately higher heat transfer coefficients, indicating that hydraulic diameter has a stronger influence on pressure loss than on heat transfer. Existing correlations predicted frictional pressure drop reasonably well but showed limited accuracy for heat transfer coefficient under high mass flux microchannel conditions. Therefore, a modified correlation was proposed by refining the vapor–liquid interaction term, resulting in improved predictive performance within the investigated range. The findings provide guidance for the design and analysis of microchannel heat exchangers operating at high mass flux conditions.