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Experimental investigation on flow boiling characteristics of HFO-1234yf in a 0.5 mm microchannel. 

Author(s) : FENG L., ZHONG K., XIAO X., JIA H., LUO X.

Type of article: IJR article

Summary

The flow boiling heat transfer of environmentally friendly refrigerant HFO-1234yf in a horizontal circular microchannel is experimentally investigated. The inner diameter and heating length of the test channel are 0.5 mm and 300 mm, respectively. Experiments are conducted at relatively high mass flux ranging from 750 to 1500 kg m-2 s-1, heat flux from 25 to 85 kW m-2 and inlet pressure between 0.604 and 0.634 MPa. The heat flux is stepwise imposed to the test channel until dryout occurs. The flow boiling heat transfer characteristics are analyzed in detail. In the pre-dryout region, the heat transfer coefficient (HTC) is found to be mainly determined by the heat flux, while the effect of mass flux is weak. Two different HTC behaviors are observed at low and high mass fluxes, which can be attributed to the prominent effect of thin liquid film evaporation on heat transfer and the occurrence of partial dryout. Moreover, the oscillation of mass fluxes and wall temperatures are observed at high mass flux conditions, resulting in heat transfer deterioration. In the post-dryout region, the critical heat flux (CHF) is found to increase with mass flux, while the critical vapor quality would decrease. Finally, the experimental data of HTC and CHF are compared with correlations from the literature and good agreements are presented.

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Pages: 11 p.

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Details

  • Original title: Experimental investigation on flow boiling characteristics of HFO-1234yf in a 0.5 mm microchannel. 
  • Record ID : 30029434
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 136
  • Publication date: 2022/04
  • DOI: http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2022.01.015
  • Document available for consultation in the library of the IIR headquarters only.

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