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Boiling heat transfer and flow characteristics of falling film of HFO refrigerant on vertical plate.

Number: 2476

Author(s) : NUMATA N., JIGE D., INOUE N.

Summary

This study experimentally investigated the heat transfer and flow behaviors of falling film boiling of R1336mzz(E) on a vertical plate to clarify the effects of boiling bubble behavior, liquid film breakdown, and dry patches on the heat transfer and flow behaviors of HFO refrigerants. The liquid film flowed down with waves at the vapor–liquid interface. The generation and collapse of the boiling bubbles were observed in the liquid film. As the heat flux increased and the film mass flow rate decreased, the size of the dry patches increased. However, the dry patches were rewetted by a thicker liquid film flowing at higher liquid mass flow rate. The heat transfer coefficients increased with increasing heat flux and saturation temperature and drastically decreased owing to the expansion of the dry patches. In addition, the heat transfer coefficients began to decrease with respect to the film mass flow rate when the wet area fraction became under 0.6. The wet area fractions and heat transfer coefficients of R1336mzz(E) were lower than those of R1234ze(E) under all heat flux conditions. The heat transfer deterioration by the dry patch of R1336mzz(E) was larger than that of R1234ze(E) at high heat flux conditions.

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  • Original title: Boiling heat transfer and flow characteristics of falling film of HFO refrigerant on vertical plate.
  • Record ID : 30033055
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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