Heat Transfer in Suspension Plasma Spraying

Jadidi, Mehdi; Vardelle, Armelle; Dolatabadi, Ali; Moreau, Christian

doi:10.1007/978-3-319-32003-8_30-1

Cited by 3 publications

(4 citation statements)

References 101 publications

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“…As mentioned above, in general, the velocity and temperature across the plasma crossflow are unsteady and nonuniform. However, for an argon plasma, the fluctuations can be negligible and the profiles are functions of space only [2], [13]. To perform the simulations, first, the profiles of velocity and temperature at the torch exit for an argon plasma flow were obtained from the of Wan et al [20]:…”

Section: Methodsmentioning

confidence: 99%

“…Suspension is a combination of solid nano/submicron sized particles, a base liquid like water or ethanol, and a dispersant for stabilization. Solution is made by dissolving metal salts or precursors in a solvent [2]. In these techniques, first, suspension or solution precursor is injected into a high-velocity hightemperature plasma crossflow which breaks jet into the ligaments and droplets (see Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Breakup characteristics in plasma spraying of solution precursors and suspensions

Shalbaf

Hashemi

Jadidi

et al. 2021

ICLASS

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Solution precursor and suspension plasma spraying are emerging technologies to produce functional nanostructured coatings at moderate cost. In general, in these techniques, liquid is injected radially into a high-velocity high-temperature plasma flow. After liquid breakup and evaporation, solid particles remain in the field and impact the substrate. Preliminary studies have shown that liquid jet atomization is the main phenomenon that controls the coating quality. However, due to the complex thermophysical properties of plasma and its intricate flow physics, the breakup processes of liquid jets in plasma crossflows have not been investigated comprehensively yet. In general, the gaseous Reynolds number and the liquidto-gas density ratio in this process is around 50 and 10,000, respectively, which are far outside the limits normally observed in engines and wind tunnels. In the present work, detailed features of breakup phenomena of liquid jets in an argon plasma crossflow is provided. The finite volume scheme is used to solve the incompressible variable-density Navier-Stokes equations. In addition, volume of fluid (VOF) approach is utilized to track the gas-liquid interfaces. Overall, two different cases are simulated and different characteristics such as spray trajectory and droplet size distributions are investigated.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Breakup characteristics in plasma spraying of solution precursors and suspensions

Shalbaf

Hashemi

Jadidi

et al. 2021

ICLASS

Self Cite

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“…Indeed, although several parameters like column and surface breakup, droplet size and velocity distributions, Sauter mean diameter (SMD), etc. have been used to study the LJIC comprehensively, the penetration height has been considered as one of the most important parameters since it indicates the location of droplets in the field and shows how well the liquid is mixed with the gas flow [4], [5]. It is worth mentioning that, in the application of thermal spray coatings, the location of droplets in the field is extremely important as low or high penetration height will significantly reduce the deposition rate [6].…”

Section: Introductionmentioning

confidence: 99%

“…depend on both space and time [12]. Moreover, due to hydrodynamic instabilities, a pulsed suspension liquid jet usually interacts with the crossflow [3], [5]. The above discussion makes it clear that developing an accurate explicit equation or model, which considers the effects of several parameters for prediction of the penetration height is challenging.…”

Section: Introductionmentioning

confidence: 99%

An Artificial Neural Network for the Prediction of Penetration Height of Aerated Elliptical Liquid Jets in Gaseous Crossflows

Jadidi

Shaghaghian

Dworkin

et al. 2021

ICLASS

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The breakup of a liquid jet by a high-velocity gaseous crossflow has many applications in industry. Penetration height of the liquid jets in crossflows is considered as the main parameter of interest, and several empirical correlations for it have been developed by many researchers. However, recent studies show that significant differences between the predictions of the available correlations exist since the liquid jet in crossflow is a complex process and the penetration height depends on many parameters and variables. In the present study, it is shown that, although developing an accurate explicit equation or model is difficult, an Artificial Neural Network (ANN) is able to estimate the penetration height precisely. To train and test the network, input and output data have been obtained from experiments conducted in a wind tunnel. Overall, 48 different experiments have been performed, and 45 cases have been selected and partitioned into two parts: 80% for training and 20% for testing. Afterward, the remaining three cases have been used independently to test the network performance rigorously. In summary, it is revealed that ANNs enable the accurate prediction of penetration heights and have great potential to be used for more complicated operating conditions.

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On the trajectory of nonturbulent liquid jets in subsonic crossflows at different density ratios

Jadidi

Dolatabadi

2018

Theoretical and Applied Mechanics Letters

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Heat Transfer in Suspension Plasma Spraying

Cited by 3 publications

References 101 publications

Breakup characteristics in plasma spraying of solution precursors and suspensions

Breakup characteristics in plasma spraying of solution precursors and suspensions

An Artificial Neural Network for the Prediction of Penetration Height of Aerated Elliptical Liquid Jets in Gaseous Crossflows

On the trajectory of nonturbulent liquid jets in subsonic crossflows at different density ratios

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