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Sedimentation and convective boiling heat transfer of CuO-water/ethylene glycol nanofluids

journal contribution
posted on 2023-02-01, 01:09 authored by Mohsen Sarafraz, F Hormozi, M Kamalgharibi
The convective boiling characteristics of dilute dispersions of CuO nanoparticles in water/ethylene glycol as a base fluid were studied at different operating conditions of (heat fluxes up to 174 kW m-2, mass fluxes range of 353-1,059 kg m-2 s-1 and sub-cooling level of 343, 353 and 363 K) inside the annular duct. The convective boiling heat transfer coefficients of nanofluids in different concentrations (vol%) of nanoparticles (0.5, 1, and 1.5) were also experimentally quantified. Results demonstrated the significant augmentation of heat transfer coefficient inside the region with forced convection dominant mechanism and deterioration of heat transfer coefficient in region with nucleate boiling dominant heat transfer mechanism. Due to the scale formation around the heating section, fouling resistance was also experimentally measured. Experimental data showed that with increasing the heat and mass fluxes, the heat transfer coefficient and fouling resistance dramatically increase and rate of bubble formation clearly increases. Obtained results were then compared to some well-known correlations. Results of these comparisons demonstrated that experimental results represent the good agreement with those of obtained by the correlations. Consequently, Chen correlation is recommended for estimating the convective flow boiling heat transfer coefficient of dilute CuO-water/ethylene glycol based nanofluids. © 2014 Springer-Verlag Berlin Heidelberg.

History

Journal

Heat and Mass Transfer/Waerme- und Stoffuebertragung

Volume

50

Pagination

1237 - 1249

ISSN

0947-7411

eISSN

1432-1181

Publication classification

C1.1 Refereed article in a scholarly journal