Experimental study of laminar convective condensation of pure vapor inside an inclined circular tube

Yuriy Lyulin, Igor Marchuk, Sergey Chikov, Oleg Kabov

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Convective condensation of pure ethanol vapor inside a smooth tube of inner diameter 4.8 mm and of length 200 mm is studied. The experiments have been carried out at temperature 58°C corresponding to the pressure of 440 mbar, the vapor mass velocity varying from 0.24 to 2.04 kg/(m2 s). The dependency of the Heat Transfer Coefficient (HTC) is investigated experimentally both subject to the temperature difference between the saturated vapor and the wall and subject to the condenser inclination. The results show that the HTC reduces with growth of the temperature difference. The dependency of the HTC on inclination has a maximum in the range 15°-35° due to the complex gravity drainage mechanism of the condensed liquid. The results could be useful for development of compact effective cooling systems for space and ground application.

Original languageEnglish
Pages (from-to)439-445
Number of pages7
JournalMicrogravity Science and Technology
Issue number4
Publication statusPublished - 1 Nov 2011



  • Condenser
  • Heat transfer coefficient
  • In-tube condensation
  • Inclination angle
  • Surface tension

ASJC Scopus subject areas

  • Modelling and Simulation
  • Engineering(all)
  • Physics and Astronomy(all)
  • Applied Mathematics

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