Effects of interfacial heat transfer, surface tension and contact angle on the formation of plasma-sprayed droplets through simulation study

Zhang, Yongang; Matthews, Steven; Tran, Anh Phuong; Hyland, Margaret

doi:10.1016/j.surfcoat.2016.09.066

Cited by 42 publications

(11 citation statements)

References 37 publications

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“…The influence of interfacial heat transfer, surface tension, and contact angle on the formation of plasma-sprayed droplets was studied by Zhang et al . 7 . They indicated that the interfacial heat transfer was the key parameter influencing the droplet cooling process and the final splat morphology.…”

Section: Introductionmentioning

confidence: 99%

A Water Droplet Pinning and Heat Transfer Characteristics on an Inclined Hydrophobic Surface

Al‐Sharafi

Yilbaş

Ali

et al. 2018

Sci Rep

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A water droplet pinning on inclined hydrophobic surface is considered and the droplet heat transfer characteristics are examined. Solution crystallization of polycarbonate is carried out to create hydrophobic characteristics on the surface. The pinning state of the water droplet on the extreme inclined hydrophobic surface (0° ≤ δ ≤ 180°, δ being the inclination angle) is assessed. Heat transfer from inclined hydrophobic surface to droplet is simulated for various droplet volumes and inclination angles in line with the experimental conditions. The findings revealed that the hydrophobic surface give rise to large amount of air being trapped within texture, which generates Magdeburg like forces between the droplet meniscus and the textured surface while contributing to droplet pinning at extreme inclination angles. Two counter rotating cells are developed for inclination angle in the range of 0° < δ < 20° and 135° < δ < 180°; however, a single circulation cell is formed inside the droplet for inclination angle of 25° ≤ δ ≤ 135°. The Nusselt number remains high for the range of inclination angle of 45° ≤ δ ≤ 135°. Convection and conduction heat transfer enhances when a single and large circulation cell is formed inside the droplet.

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Section: Introductionmentioning

confidence: 99%

A Water Droplet Pinning and Heat Transfer Characteristics on an Inclined Hydrophobic Surface

Al‐Sharafi

Yilbaş

Ali

et al. 2018

Sci Rep

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“…As shown in simulation results of Fig. 9, thermal gradient radially exist between center and periphery for sample I, sample II and sample III, and this can be explained by the composite action of (i) larger thermal diffusivity of molten solder [30], and (ii) differential thermal contact resistances of the interfaces at the center and periphery [31,32,33,34]. In general, with the improvement of wettability of solder bulk through NPs adding into flux and subsequent enlargement of interfacial area, the difference of thermal gradient will be more significant between center and periphery of solder bulk.…”

Section: Temperature and Velocity Distribution In Liquid Solder During Air Coolingmentioning

confidence: 81%

Geometrical Effects of Cu@Ag Core–Shell Nanoparticles Treated Flux on the Growth Behaviour of Intermetallics in Sn/Cu Solder Joints

Shang

Kunwar

Wang

et al. 2019

Electron. Mater. Lett.

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Solder ball of initial diameter 1.4 mm, was reflow soldered with Cu substrate at 523.15 K using flux doped with Cu@Ag core-shell nanoparticles (NPs) in the proportion 0 -2 wt. %. The solders were then air cooled to room temperature. The use of NPs, by reducing the base height (H) of the solder and enhanced the diameter (W) of the solder, caused an overall increase in the spread ratio of the solder. The altered magnitudes of heat and mass transfer in these geometrically different but constant volume specimens were analyzed using finite element method. The occurrence of differential concentration gradient, radial thermal gradient and velocity magnitudes, in solders with differing geometry were numerically elaborated. The Cu 6 Sn 5 intermetallic compound (IMC) formed at the Cu/Sn interface, was obtained to be the thickest for the specimen using undoped flux, whereas it was found to be smallest for the sample processed with flux containing 0.5 % NPs. From the growth kinetics

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“…Owing to the difference in thermal conductivity, as we go farther from the 8090 substrate, the heat dissipation of the coating decreases. This, coupled with the heat accumulation generated by continuous spraying, leads to a difference in the cooling rate of the molten droplets in the longitudinal direction [35]. The droplets at the bottom cool faster and the upper droplets cool slowly, which is borne out by microscopic observation in which a single molten droplet always solidifies from the bottom up.…”

Section: Resultsmentioning

confidence: 99%

Interfacial bonding of low-pressure plasma-sprayed Fe-based amorphous coating on 8090 Al–Li alloy

Hao

Wang

Chen

et al. 2023

Surface Engineering

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Fe-based amorphous coatings (AMC) are deposited on 8090 Al-Li alloy using low-pressure plasma spraying. Coating's microstructure and interfacial characteristics are investigated. The coating is mainly amorphous in structure. Some crystalline phases were observed between the two splats. The corrosion current density of this coating is two orders of magnitude less compared to 8090. The coating has high density as the average porosity is less than 0.5%. Because of partial melting and quick cooling of the 8090 alloy in the process of molten droplets deposition, there is an amorphous transition zone formed at the interface of AMC/ 8090 Al-Li alloy, which indicates localized metallurgical bonding. In electrochemical testing, the coating shows an obvious passivation tendency, and crystallization between splats is the main cause of corrosion. Owing to the low oxygen content, the coating exhibits excellent wear resistance.

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Effects of interfacial heat transfer, surface tension and contact angle on the formation of plasma-sprayed droplets through simulation study

Cited by 42 publications

References 37 publications

A Water Droplet Pinning and Heat Transfer Characteristics on an Inclined Hydrophobic Surface

A Water Droplet Pinning and Heat Transfer Characteristics on an Inclined Hydrophobic Surface

Geometrical Effects of Cu@Ag Core–Shell Nanoparticles Treated Flux on the Growth Behaviour of Intermetallics in Sn/Cu Solder Joints

Interfacial bonding of low-pressure plasma-sprayed Fe-based amorphous coating on 8090 Al–Li alloy

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