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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v5.i1-4.120
pages 137-143

EXPERIMENTAL STUDY OF A TWO-PHASE CLOSED THERMOSYPHON CHARGED WITH AN IMMISCIBLE MIXTURE

Julia F. Carneiro
Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis 88040-900, Brazil
Kenia W. Milanez
Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis 88040-900, Brazil
Fernando Milanese
Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis 88040-900, Brazil
Marcia Barbosa Henriques Mantelli
Heat Pipe Laboratory (LABTUCAL), Federal University of Santa Catarina, Mechanical Engineering Department, 88040-900, Trindade, Florianopolis, SC, Brazil

ABSTRACT

A mixture of water and naphthalene was used as working fluid for a two-phase closed thermosyphon in order to study the behavior during the operation of such device working with an immiscible mixture. A small proportion of water was used and tests using a glass tube were initially made to visualize the phenomenon. A metallic tube was constructed to observe the temperature profile under higher values of heat input. The experiments showed that the naphthalene concentrates in the lower part of the tube while the water occupies the upper part at the end of the condenser. There is a temperature difference between these two sections, with a significant drop in the transition from naphthalene to water. The latter condenses on the wall surface and evaporates as the drop crosses the interface. The system works as two thermosyphons connected in series. The analysis of the interface position shows that an increase on the power supplied to the system leads to an advance of the interface towards the top of the thermosyphon.


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