On the Scaling of CHF with Gravity in Pool Boiling on Cylinders

DOI Web Site 15 References
  • ZHAO J. F.
    National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences
  • YAN N.
    National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences
  • LIU G.
    National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences
  • WAN S. X.
    National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences
  • HU W. R.
    National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences

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Abstract

In the present paper, a comprehensive literature review is presented focus on the scaling of CHF (critical heat flux) with gravity in pool boiling heat transfer from heated cylindrical surfaces, particularly in cases of electrically heated wires with small diameter. New data of CHF on thin wires utilizing a TCPB (Temperature-Controlled Pool Boiling) device in different gravity levels obtained from the recent space experiment aboard the 22nd Chinese recoverable satellite and the control experiments on the ground before and after the space flight are presented and discussed. The experiments are performed at 0.1 MPa and with a liquid subcooling of 26℃ nominally. It's found that the correlation of Lienhard & Dhir can predict the present data with good agreement, although the range of the dimensionless radius R ' is extended by three or more decades above the originally set limit. Based upon the different performances of CHF in constant and variable gravity conditions reported in the literature, it's conjecturable that there may exist some other parameters in addition to R' that play important roles in the CHF phenomenon with small Bond number.

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