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Fabrication, Characterization and Thermo-physical Property Evaluation of SiCNanofluids for Heat Transfer Applications
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.ORCID-id: 0000-0001-5380-975X
KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
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2014 (Engelska)Ingår i: Nano-Micro Letters, ISSN 2150-5551, Vol. 6, nr 2, s. 178-189Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Nanofluids (NFs) are nanotechnology-based colloidal suspensions fabricated by suspending nanoparticles (NPs) in a base liquid. These fluids have shown potential to improve the heat transfer properties of conventional heat transfer fluids. In this study we report in detail on the fabrication, characterization and thermo-physical property evaluation of SiC NFs, prepared using SiC NPs with different crystal structure, for heat transfer applications.  For this purpose, a series of SiC NFs containing SiC NPs with different crystal structure (α-SiC and β-SiC) were fabricated in a water (W)/ethylene glycol (EG) mixture (50/50 wt % ratio). Physicochemical properties of NPs/NFs were characterized by using various techniques such as powder X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), Dynamic Light Scattering (DLS) and Zeta Potential Analysis were performed. Thermo-physical properties including thermal conductivity (TC) and viscosity for NFs containing SiC particles (α- and β- phase) were measured. The results showed among all suspensions, NF fabricated with α-SiC particles have more favorable thermo-physical properties compared to the NFs fabricated with β-SiC; the observed difference was attributed to combination of several factors, including crystal structure (β- vs. α-), sample purity, and residual chemicals exhibited on SiC nanoparticles. A TC enhancement of ~20% while 14% increased viscosity were obtained for a NF containing 9wt% of particular type of α-SiC NPs indicating promising capability of these kind of NFs for further heat transfer characteristics investigations. 

Ort, förlag, år, upplaga, sidor
2014. Vol. 6, nr 2, s. 178-189
Nyckelord [en]
SiC nanoparticles, Nanofluids, Thermal conductivity, Viscosity, Thermo-physical property
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
SRA - Energi
Identifikatorer
URN: urn:nbn:se:kth:diva-144271DOI: 10.5101/nml.v6i2.p178-189ISI: 000337033300010Scopus ID: 2-s2.0-84958743111OAI: oai:DiVA.org:kth-144271DiVA, id: diva2:712515
Forskningsfinansiär
Vetenskapsrådet
Anmärkning

QC 20140416

Tillgänglig från: 2014-04-15 Skapad: 2014-04-15 Senast uppdaterad: 2017-03-01Bibliografiskt granskad
Ingår i avhandling
1. Engineering Nanofluids for Heat Transfer Applications
Öppna denna publikation i ny flik eller fönster >>Engineering Nanofluids for Heat Transfer Applications
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Nanofluids (NFs) are nanotechnology-based colloidal dispersion prepared by dispersing nanoparticles (NPs) in conventional liquids, as the base liquid. These advanced fluids have displayed potential to enhance the performance of conventional heat transfer fluids. This work aims at providing an insight to the field of NFs by investigating in detail the fabrication and evaluation of physico-chemical, thermo-physical and heat transfer characteristics of NFs for practical heat transfer applications. However, in order to utilize NFs as heat transfer fluids in real applications there are some challenges to overcome. Therefore, our goal is not only to optimize the thermo-physical properties of NFs with the highest thermal conductivity (TC) and minimal impact of NPs on viscosity, but also on preparing NFs with good stability and the best heat transfer performance. In the first stage, detailed studies were carried out to engineer NFs with good stability and optimal thermo-physical properties. In this work we investigated the most important factors, and the dependence of thermo-physical properties of NFs, including NP composition and concentration, NF stability, surface modifiers, particle size (NP size and particle with micron size), NF preparation method (two-step vs one-step method) and base liquid was studied. We also demonstrated, for the first time, the role of crystal structure, exemplified by alpha- and beta- SiC particles, on thermo-physical properties of NFs. For these purposes several NFs were fabricated using different nanostructured materials and various base liquids by one-step and two-step methods. An optimization procedure was designed to keep a suitable control in order to reach the ultimate aim where several stages were involved to check the desired characteristics of each NF system. Among several NFs systems studied in the first stage evaluation, a particular NF system with 9 wt% concentration, engineered by dispersing SiC NPs with alpha- crystal structure in water/ethylene glycol as based liquid exhibited the optimal thermo-physical properties. This NF was the only case which could pass the all criteria involved in the optimization procedure by exhibiting good stability, TC enhancements of ~20% with only 14% increase in viscosity at 20 oC. Therefore, this engineered NF was considered for next phase evaluation, where heat transfer coefficient (HTC) tests were designed and carried out to evaluate the thermal transport property of the selected alpha- SiC NF. A HTC enhancement of 5.5% at equal pumping power, as realistic comparison criteria, was obtained indicating the capability of this kind of NFs to be used in industrial heat transfer applications. These findings are among the few studies in the literature where the heat transfer characteristics of the NFs were noticeable, reproducible and based on a realistic situation with capability of commercializing as effective heat transfer fluid.  

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2014. s. xiii, 65
Serie
TRITA-ICT/MAP AVH, ISSN 1653-7610 ; 2014:03
Nyckelord
nanofluid, thermal conductivity, viscosity, heat transfer, heat transfer coefficient, HTC, SiC nanoparticles, Cu nanoparticles, mesoporous silica, CNT, microwave synthesis
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Kemi
Identifikatorer
urn:nbn:se:kth:diva-144217 (URN)978-91-7595-056-3 (ISBN)
Disputation
2014-05-30, Sal D, KTH-Forum, Isafjordagatan 39, Kista, 10:30 (Engelska)
Opponent
Handledare
Projekt
Nanohex
Anmärkning

QC 20140416

Tillgänglig från: 2014-04-16 Skapad: 2014-04-15 Senast uppdaterad: 2014-05-12Bibliografiskt granskad

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Saleemi, MohsinPalm, BjörnToprak, Muhammet S.

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Nikkam, NaderSaleemi, MohsinHaghighi, Ehsan BitarafGhanbarpour, MortezaKhodabandeh, RahmatollahMuhammed, MamounPalm, BjörnToprak, Muhammet S.
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