Pregled bibliografske jedinice broj: 1226041
Influence of MWCNTs geometry and surface oxidation on rheological and thermal properties of PEG nanofluids
Influence of MWCNTs geometry and surface oxidation on rheological and thermal properties of PEG nanofluids // Journal of thermal analysis and calorimetry, 148 (2023), 4; 1351-1364 doi:10.1007/s10973-022-11558-3 (međunarodna recenzija, članak, znanstveni)
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Naslov
Influence of MWCNTs geometry and surface oxidation
on rheological and thermal properties of PEG
nanofluids
Autori
Rebrović, Lucija ; Jukić, Ante ; Faraguna, Fabio
Izvornik
Journal of thermal analysis and calorimetry (1388-6150) 148
(2023), 4;
1351-1364
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
PEG-200 ; MWCNT ; nanofluid ; rheological properties ; thermal conductivity ; phase change materials
Sažetak
The focus of this research was on the thermal conductivity and rheological properties of poly(ethylene glycol) with a molecular mass of 200 g mol− 1 (i.e., PEG200) loaded with four different types of multi-walled carbon nanotubes (MWCNTs) in a wide concentration range up to 10 mass%. MWCNTs used differ in size (both diameter and length) and the content of COOH (oxidized) functional groups on their surface. It was found that the use of oxidized, shorter and wider MWCNTs in PEG200 results in highest enhancement in thermal conductivity by 133% for 10 mass% MWCNTs-PEG200 nanofluids. Investigation of the shear rate dependence of dynamic viscosity (η) showed that the use of MWCNTs in concentrations greater than 0.1 mass% changes the Newtonian behavior of PEG200 and results in the shear-thinning behavior. This behavior is strongly influenced by the MWCNT concentration in the nanofluid. When comparing the same nanofluid concentration, the highest degree of MWCNT agglomeration in PEG200 nanofluids was observed when long, thin and pristine MWCNTs were used. The thermal conductivity results were correlated with the most commonly used theoretical models: Maxwell, Hamilton- Crosser, Xue, and Murshed. Dynamic viscosity results were correlated with Einstein, Brinkman, and Brenner-Condiff theoretical models. The best agreement with the experimental results was obtained by the Maxwell and Einstein models, indicating the formation of sphere-like MWCNT agglomerates in each PEG200 nanofluid studied.
Izvorni jezik
Engleski
Znanstvena područja
Kemijsko inženjerstvo, Interdisciplinarne tehničke znanosti
POVEZANOST RADA
Projekti:
EK-EFRR-KK.01.1.1.07.0015 - Novi polimerni aditivi za maziva ulja i uljne nanofluide (NanoFlu) (Jukić, Ante, EK - KK.01.1.1.07) ( CroRIS)
Ustanove:
Fakultet kemijskog inženjerstva i tehnologije, Zagreb
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
Uključenost u ostale bibliografske baze podataka::
- CA Search (Chemical Abstracts)