Modeling of vapor condensation in a longitudinally finned minichannel

I. V. Marchuk, E. A. Chinnov, O. A. Kabov

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Heat transfer with vapor condensation inside a longitudinally finned tube is numerically studied. The proposed model considers vapor condensation on two initial flow areas, namely, annular and rivulet. The model allows prediction of pressure difference along the tube length, vapor velocity profiles in the central channel and an interfin groove, and also a velocity profile in the condensate rivulet at the bottom of the interfin channel, local heat transfer coefficients at different fin points, and average heat transfer coefficients over tube section and length. The calculations showed that in the case of vapor condensation in longitudinally finned tubes of a small diameter it is of fundamental importance to divide the flow tube section into a central channel and interfin channels. The governing vapor velocities in these channels may differ by more than an order of magnitude. The reduced vapor velocity, used in engineering calculations, does not reflect the character of dynamic vapor impact on a condensate film on the most part of the heat transfer surface. For tubes with relatively large fins the proposed model describes vapor condensation almost completely,meanwhile, the mass vapor quality by the time of filling of the grooves reaches 0.01–0.05. The highest heat transfer intensification was obtained for “sharp fins” with a high value of the fin head curvature. Comparison of results of calculation by the model with results of the known experiments on water vapor condensation yields a good qualitative and quantitative agreement for low vapor velocities at the channel inlet (under 30 m/s). The wall thermal conductivity coefficient value affects significantly the condensation efficiency.

Original languageEnglish
Pages (from-to)67-84
Number of pages18
JournalJournal of Engineering Thermophysics
Volume25
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

Fingerprint

Condensation
Tube
condensation
Vapors
vapors
Modeling
Heat Transfer
fins
tubes
Heat Transfer Coefficient
Condensate
Fins (heat exchange)
Velocity Profile
heat transfer
Heat transfer
heat transfer coefficients
Water Vapor
grooves
Heat transfer coefficients
condensates

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Modelling and Simulation
  • Condensed Matter Physics
  • Environmental Engineering

Cite this

Modeling of vapor condensation in a longitudinally finned minichannel. / Marchuk, I. V.; Chinnov, E. A.; Kabov, O. A.

In: Journal of Engineering Thermophysics, Vol. 25, No. 1, 01.01.2016, p. 67-84.

Research output: Contribution to journalArticle

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