Effect of Surface Roughness on Contact Angle Measurement of Nanofluid on Surface of Stainless Steel 304 by Sessile Drop Method

Prajitno, Djoko Hadi; Maulana, Alan; Syarif, Dani Gustaman

doi:10.1088/1742-6596/739/1/012029

Cited by 47 publications

(24 citation statements)

References 9 publications

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“…The decreasing of the signal also correlates with the spreading of the liquid. This observation is consistent with study [8] where the decreasing of surface roughness increased the spreading of the liquid. The decrease in the signal with the surface roughness could be due to the role of diffuse reflectance.…”

Section: Resultssupporting

confidence: 93%

“…For rough surfaces, the contact angle becomes dynamic and a local quantity during the spreading of a liquid drop and is a function of the surface roughness and other material properties such as the surface tension and viscosity of the liquids. The influence of the surface roughness on the wetting has also received much focus from researchers as demonstrated in several studies [2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…These two methods, when combined, give information on the very first minute of the liquid spreading, and up to the 20 min. Moreover, we indirectly obtain information on the hysteresis of the contact angle [2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Table model and portable optical sensors for the monitoring of time-dependent liquid spreading over rough surfaces

Asamoah

Kanyathare

Peiponen

2018

J. Eur. Opt. Soc.-Rapid Publ.

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Background: Many applications require liquids to efficiently wet required surfaces as it denotes better performance. The dynamics of pure and complex liquid is known to influence the spreading properties; however, this influence is less understood and solicits other measuring techniques to elucidate the grey area. In this work, we demonstrate the use of simple yet novel optical methods in the monitoring of liquid spreading of pure diesel and kerosene and their binary (complex) mixtures. Methods: The optical devices are a table model and portable optical sensors which use a diffractive optical element for filtering the specular reflection from a laser speckle pattern obtained from the liquid spreading on the rough surface-liquid-air system. The surfaces used in this study were metal surface roughness standards and roughened glass surface. The viability of the devices was demonstrated using two liquids, namely diesel oil and kerosene, that have a wide difference in their contact angles. The performance of the devices was further tested using binary mixtures of the diesel oil and kerosene. Based on the scattering properties of the spreading liquids and the surfaces, the time-dependent signal was measured with the optical devices. Results: It was observed that the spreading was influenced by the surface roughness. The magnitude of the signal decreased with increased surface roughness indicating less variation in the spreading of the liquid drop with the increased surface roughness. The nature of the detected signal for the kerosene on the surface with roughness values below the wavelength of the device follows the Tanner's law of drop spreading. However, the diesel spreads at a lower rate. Additionally, the complexity of the internal interaction of the diesel-kerosene binary mixtures leads to a complex spreading mechanism on the solid surfaces allowing us to screen the adulterated liquids from the authentic diesel oil with high reliability. Conclusion: We have introduced two novel optical sensors (table model and portable) for the detection of the changes in liquid drop spreading over rough surfaces. The spreading of the liquid drops over a rough surface causes a local contact angle that experiences hysteresis during the spreading process. The spreading depends on the complexity of the liquid and the magnitude of the surface roughness. The unique configuration of the devices makes the portable sensor suitable for longer duration measurements and for field applications, whilst the table model is best suited for monitoring the first transient moments of liquid spreading and for laboratory applications. Such spreading techniques can also be utilized in the detection of wine and strong alcohol, such as vodka, adulterations with glycol and water, respectively.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Table model and portable optical sensors for the monitoring of time-dependent liquid spreading over rough surfaces

Asamoah

Kanyathare

Peiponen

2018

J. Eur. Opt. Soc.-Rapid Publ.

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“…It is known that smaller contact angles provide an early pinch-off during the bubble formation process, thus generating smaller bubbles (Kukizaki and Wada, 2008). Due to the high porosity of the woven stainless steel membrane, contact angle measurements were difficult, but the contact angle was estimated to be ~85 o according to Prajitno et al, 2016. This value is smaller than the measured contact angle for nickel membranes, which is 120 o .…”

Section: Bubble Size Characterisationmentioning

confidence: 95%

Microbubble-enhanced DBD plasma reactor: Design, characterisation and modelling

Wright

Taglioli

Montazersadgh

et al. 2019

Chemical Engineering Research and Design

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The emerging field of atmospheric pressure plasmas (APPs) for treatment of various solutions and suspensions has led to a variety of plasma reactors and power sources. This article reports on the design, characterisation and modelling of a novel plasma-microbubble reactor that forms a dielectric barrier discharge (DBD) at the gas-liquid interface to facilitate the transfer of short-lived highly reactive species from the gas plasma into the liquid phase. The use of microbubbles enabled efficient dispersion of long-lived reactive species in the liquid and UVC-induced oxidation reactions are triggered by the plasma radiation at the gas-liquid interface. A numerical model was developed to understand the dynamics of the reactor, and the model was validated using experimental measurements. Fluid velocities in the riser region of the reactor were found to be an order of magnitude higher for smaller bubbles (~500 µm diameter) than for larger bubbles (~2500 µm diameter); hence provided well-mixed conditions for treatment. In addition to other reactive oxygen species (ROS) and reactive nitrogen species (RNS), �� Interfacial area m-1 Dynamic liquid velocity Pa s Volume m 3 Molecular weight g mol-1 1.0 Introduction Ozone has been established as an excellent oxidising agent and used on industrial scale for water treatment worldwide (Loeb et al., 2012). Its high oxidation potential of 2.07 V is superior to that of chlorine (1.36 V), and

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“…Wettability and surface energy of steel are affected by both chemical and topographical properties of the native steel. Wenzel 1936 [7] stated that there is a strong relationship between surface roughness, contact angle and wettability of the surface. Additionally, contact angle is an essential parameter for the detection of mass and heat transfer of stainless steels especially those steels that are used as structural materials for nuclear power plants [8].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and gamma ray attenuation properties of N316L steel treated by rf plasma as a nuclear material

Saeed

Eissa

El-Hossary

et al. 2019

Arab Journal of Nuclear Sciences and Applications

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The effects of plasma surface engineering on average surface roughness, wettability and gamma ray attenuation properties of AISI316L standard steel sample were investigated. The results showed an increase in surface roughness accompanied with an increase in the surface energy and a decrease in the contact angle of the N316L sample treated by plasma carbonitriding. The experimental measurements of gamma ray attenuation properties of the investigated stainless-steel alloys were carried out using gamma lines emitted from 232 Th and 60 Co gamma ray sources. The attenuation parameters such as linear and mass attenuation coefficients and half value layer were determined experimentally and theoretically. The obtained results indicate that the rf plasma surface treatment is an effective method for developing the surface tribological properties of the treated stainless-steel alloy without any change in the gamma ray attenuation properties. The obtained results suggest the suitability of N316L for in-core applications of nuclear reactor systems.

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Effect of Surface Roughness on Contact Angle Measurement of Nanofluid on Surface of Stainless Steel 304 by Sessile Drop Method

Cited by 47 publications

References 9 publications

Table model and portable optical sensors for the monitoring of time-dependent liquid spreading over rough surfaces

Table model and portable optical sensors for the monitoring of time-dependent liquid spreading over rough surfaces

Microbubble-enhanced DBD plasma reactor: Design, characterisation and modelling

Mechanical and gamma ray attenuation properties of N316L steel treated by rf plasma as a nuclear material

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