Open AccessInterfacial waviness during condensation heat transfer
Author(s) -
Arianna Berto,
Pascal Lavieille,
Marco Azzolin,
Stefano Bortolin,
Marc Miscevic,
Davide Del Col
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2116/1/012014
Subject(s) - waviness , heat transfer coefficient , materials science , condensation , shadowgraph , thermodynamics , heat transfer , heat exchanger , convective heat transfer , mechanics , optics , composite material , physics
Heat transfer coefficients and liquid film thickness have been measured during convective condensation inside a 3.4 mm internal diameter channel. Condensation tests have been run with refrigerant R245fa during vertical downflow at mass velocity equal to 50 kg m -2 s -1 and 100 kg m -2 s -1 . The test section is composed of two heat exchangers for the measurement of the heat transfer coefficient connected by means of a glass tube designed for the visualization of the two-phase flow patterns and for the measurement of the liquid film thickness. The liquid film thickness is determined by coupling a shadowgraph technique and chromatic confocal measurements. The measured values of heat transfer coefficient and liquid film thickness are reported and analysed together to investigate the effect of waves on the condensation heat transfer mechanisms.