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Type: Journal article
Title: Sedimentation and convective boiling heat transfer of CuO-water/ethylene glycol nanofluids
Author: Sarafraz, M.
Hormozi, F.
Kamalgharibi, M.
Citation: Heat and Mass Transfer, 2014; 50(9):1237-1249
Publisher: Springer
Issue Date: 2014
ISSN: 0947-7411
Statement of
M.M. Sarafraz, F. Hormozi, M. Kamalgharibi
Abstract: 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.
Keywords: Heat transfer coefficient; base fluid; boiling heat transfer; Forced convective heat transfer; pool boiling heat transfer
Rights: © Springer-Verlag Berlin Heidelberg 2014
RMID: 0030038156
DOI: 10.1007/s00231-014-1336-y
Appears in Collections:Mechanical Engineering publications

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