Experimental investigation of small diameter two-phase closed thermosyphons charged with water, FC-84, FC-77 & FC-3283
Citation:
H. Jouhara, A.J. Robinson 'Experimental investigation of small diameter two-phase closed thermosyphons charged with water, FC-84, FC-77 & FC-3283' in Applied Thermal Engineering, 2009Download Item:
Abstract:
An experimental investigation of the performance of thermosyphons charged with water as well as the
dielectric heat transfer liquids FC-84, FC-77 and FC-3283 has been carried out. The copper
thermosyphon was 200 mm long with an inner diameter of 6 mm, which can be considered quite small
compared with the vast majority of thermosyphons reported in the open literature. The evaporator
length was 40 mm and the condenser length was 60 mm which corresponds with what might be
expected in compact heat exchangers. With water as the working fluid two fluid loadings were
investigated, that being 0.6 ml and 1.8 ml, corresponding to approximately half filled and overfilled
evaporator section in order to ensure combined pool boiling and thin film evaporation/boiling and
pool boiling only conditions respectively. For the FlourinertTM liquids, only the higher fill volume was
tested as the aim was to investigate pool boiling opposed to thin film evaporation. Generally, the water
charged thermosyphon evaporator and condenser heat transfer characteristics compared well with
available predictive correlations and theories. The thermal performance of the water charged
thermosyphon also outperformed the other three working fluids in both the effective thermal
resistance as well as maximum heat transport capabilities. Even so, FC-84, the lowest saturation
temperature fluid tested, shows marginal improvement in the heat transfer at low operating
temperatures. All of the tested FlourinertTM liquids offer the advantage of being dielectric fluids,
which may be better suited for sensitive electronics cooling applications and were all found to provide
adequate thermal performance up to approximately 30-50 W after which liquid entrainment
compromised their performance.
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http://people.tcd.ie/arobinsDescription:
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Author: ROBINSON, ANTHONY
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ElsevierType of material:
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Applied Thermal EngineeringAvailability:
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Mechanical & Manufacturing EngineeringMetadata
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