Effects of two-phase flow conditions on flow boiling CHF enhancement of magnetite-water nanofluids

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Experimental studies were conducted to understand the flow boiling CHF (critical heat flux) characteristics of a magnetite-water nanofluid for a wide range of exit qualities, especially for intermediate and relatively high exit qualities. In contrast to previous studies, a wide range of exit qualities was considered for various heating lengths, mass fluxes, and inlet sub-cooling. CHF enhancement was observed when the exit quality was low and a DNB-like thermal crisis occurred: these results were consistent with the previous studies reporting a delay in DNB when using nanofluids. Meanwhile, this CHF enhancement did not occur for high exit qualities. In annular flow and high exit qualities, an LFD-type thermal crisis occurred. This CHF enhancement is not expected using a nanofluid under the LFD condition because LFD phenomena are nearly unaffected by the surface conditions. As the exit quality increased from 0.07 to 0.74, the amount of CHF enhancement gradually decreased and approached zero. In conclusion, this CHF enhancement using a nanofluid is not expected for annular flow with a relatively high exit quality.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2014-07
Language
English
Article Type
Article
Keywords

CRITICAL HEAT-FLUX; THERMAL-CONDUCTIVITY; ATMOSPHERIC-PRESSURE; SURFACE; NANOPARTICLES; FLUIDS

Citation

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.74, pp.278 - 284

ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2014.03.028
URI
http://hdl.handle.net/10203/187339
Appears in Collection
NE-Journal Papers(저널논문)
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