Experimental Investigation of Material Surface Erosion Caused by TiO&lt;SUB&gt;2&lt;/SUB&gt; Nanofluid Impingement

George, Gibin; Sabareesh, R. Krishna; Thomas, Shijo; Sajith, V.; Hanas, T.; Das, Souvik; Sobhan, C. B.

doi:10.1166/jon.2014.1087

Cited by 9 publications

(6 citation statements)

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“…But optical microscopy imaging (magnification 5000x) showed different surface-modification mechanisms: while reference fluid completely removed polishing scratches and enlarged original small pitting for the 112-hour test, the 2%-alumina-nanofluid did not completely remove polishing scratches and it led to widespread small pitting, which seems to cluster along some original scratching lines. Since alumina is fairly chemically inert, material removal in this early surface-modifying mechanism in aluminum should be attributed to mainly mild abrasion mechanisms, with no significant chemical erosion component; these mechanisms are in good agreement with the findings of George et al [28], which were obtained for titanium-dioxide nanofluid jet-impinged on aluminum.…”

Section: Discussionsupporting

confidence: 89%

“…George et al [28] recently presented experimental work on erosion effects of a nanofluid of 0.1%-volume of TiO 2 in distilled water. They tested for up to 10 hours the jetimpingement effects at different angles on aluminum and cast iron surfaces, by measuring weight loss, roughness by speckle interferometry, and hardness after tests.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

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Jet-Impingement Effects of Alumina-Nanofluid on Aluminum and Copper

Aktaruzzaman¹,

Stregles²,

Soloiu³

et al. 2014

Advances in Tribology

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Nanofluids are nanosize-powder suspensions that are of interest for their enhanced thermal transport properties. They are studied as promising alternatives to ordinary cooling fluids, but the tribiological effects of nanofluids on cooling-system materials are largely unknown. The authors have developed methodology that uses jet impingement on typical cooling-system materials to test such effects. The work is presented of the authors' research on the interactions of a typical nanofluid (2% volume of alumina nanopowders in a solution of ethylene glycol in water) which is impinged on aluminum and copper specimens for tests as long as 112 hours. The surface changes were assessed by roughness measurements and optical-microscope studies. Comparative roughness indicate that both the reference cooling fluid of ethylene glycol and water and its nanofluid with 2% alumina produce roughness changes in aluminum (even for the shortest 3-hour test), but no significant roughness differences were observed between them. No significant roughness changes were observed for copper. Microscopy observations, however, show different surface modifications in both aluminum and copper by both the nanofluid and its base fluid. The possible mechanisms of early erosion are discussed. These investigations demonstrate suitable methods for the testing of nanofluid effects on cooling system-materials.

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Section: Discussionsupporting

confidence: 89%

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Jet-Impingement Effects of Alumina-Nanofluid on Aluminum and Copper

Aktaruzzaman¹,

Stregles²,

Soloiu³

et al. 2014

Advances in Tribology

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“…George et al. [41]. suggested that the erosive wear depends on nanoparticles size, shape, impinge velocity, particles concentration and angle of attack and temperature of the fluids.…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation on convective heat transfer and pressure drop of cone helically coiled tube heat exchanger using carbon nanotubes/water nanofluids

Kumaravel¹,

Kumar²

2019

Heliyon

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This study investigates the heat transfer and the pressure drop of cone helically coiled tube heat exchanger using (Multi wall carbon nano tube) MWCNT/water nanofluids. The MWCNT/water nanofluids at 0.1%, 0.3%, and 0.5% particle volume concentrations were prepared with the addition of surfactant by using the two-step method. The tests were conducted under the turbulent flow in the Dean number range of 2200 < De < 4200. The experiments were conducted with experimental Nusselt number is 28%, 52% and 68% higher than water for the nanofluids volume concentration of 0.1%, 0.3% and 0.5% respectively. It is found that the pressure drop of 0.1%, 0.3% and 0.5% nanofluids are found to be 16%, 30% and 42% respectively higher than water. It is studied that the prepared MWCNT/water nanofluids show good stability even after 45 days of preparation and there is no considerable deposit of nanotubes on the tube inner wall. It is also studied that there is no immediate risk of handling MWCNT and studied that there is no significant erosion of coiled tube inner wall surface even after several test runs. Therefore the MWCNT/water nanofluids are the alternate heat transfer fluids for traditional fluids in the cone helically coiled tube heat exchanger to improve the heat transfer with considerable pressure drop.

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“…George et al. [43] reported that the wear of the tube surface depends on nanoparticles size, shape, velocity, particles concentration and turbulence of the fluids. The MWCNTs are deposited in the inner tube and they create the wear and erosion.…”

Section: Resultsmentioning

confidence: 99%

CFD analysis on heat and flow characteristics of double helically coiled tube heat exchanger handling MWCNT/water nanofluids

Kumar

Chandrasekar

2019

Heliyon

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Double helically coiled tube heat exchangers are used in different heat transfer utilization due to higher heat transfer capabilities and with their compactness. The double helically coiled tube heat exchanger increases the turbulence and enhances the maximum heat transfer rate than the straight tubes. In this investigation, the heat transfer and pressure drop of the double helically coiled heat exchanger handling MWCNT/water nanofluids have been analyzed by the computational software ANSYS 14.5 version. The computational analysis was carried out under the laminar flow condition in the Dean number range of 1300–2200. The design of new shell and double helically coiled tube heat exchanger was done by using standard designing procedure and 3D modeling was done in Cre-O 2.0 parametric. The Finite Element Analysis software ANSYS Workbench 14.5 was used to perform CFD analysis under the standard working condition. The MWCNT/water nanofluids at 0.2%, 0.4%, and 0.6% volume concentrations have been taken for this investigation. The major factors like volume concentrations of nanofluids and Dean Number are considered for predicting the heat transfer rate and pressure drop. The simulation data was compared with the experimental data. It is studied that the heat transfer rate and pressure drop increase with increasing volume concentrations of MWCNT/water nanofluids. It is found that the Nusselt number of 0.6% MWCNT/water nanofluids is 30% higher than water at the Dean number value of 1400 and Pressure drop is 11% higher than water at the Dean number value of 2200. It is found that the simulation data hold good agreement with the experimental data. The common deviation between the Nusselt number and pressure dropof CFD data and the Nusselt number and pressure drop of experimental data are found to be 7.2% and 8.5% respectively.

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Experimental Investigation of Material Surface Erosion Caused by TiO<SUB>2</SUB> Nanofluid Impingement

Cited by 9 publications

References 0 publications

Jet-Impingement Effects of Alumina-Nanofluid on Aluminum and Copper

Jet-Impingement Effects of Alumina-Nanofluid on Aluminum and Copper

Experimental investigation on convective heat transfer and pressure drop of cone helically coiled tube heat exchanger using carbon nanotubes/water nanofluids

CFD analysis on heat and flow characteristics of double helically coiled tube heat exchanger handling MWCNT/water nanofluids

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