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Heat Pipe Science and Technology, An International Journal

Publicou 4 edições por ano

ISSN Imprimir: 2151-7975

ISSN On-line: 2151-7991

EXPERIMENTAL INVESTIGATION ON THERMAL CHARACTERISTICS OF A TWO-PHASED CLOSED THERMOSYPHON USING ORGANIC NANOFLUIDS

Volume 4, Edição 1-2, 2013, pp. 157-168
DOI: 10.1615/HeatPipeScieTech.2013009720
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RESUMO

Today, combining heat pipe and nanoparticle technologies is reported to enhance the efficiency of heat transfer devices. Suspensions of nanoparticles and fluids, called nanofluids, have a great impact in heat transfer enhancement. This paper presents an experimental investigation regarding the effects of organic nanofluids on the efficiency of a two-phase closed thermosyphon. The experimental results showed that, for different input powers, in some cases (ethanol/CuO) the efficiency of the thermosyphon improved compared to the case of using pure base fluid. For instance, acetone/Fe2O3 and ethanol/CuO nanofluids with 0.5-2% weight fraction of nanoparticles as the working fluids present better thermal performance over a wide range of input power. However, the improvements were small and for ethanol/Fe2O3, nanoparticles had the reverse effect. The maximum improvement in efficiency was about 13% in some input powers. In addition, temperature distributions on the thermosyphon confirmed these results too.

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