Temperature charateristics of droplet impacting on static hot pool

Long, Fang; Chen, Guoding

doi:10.7498/aps.68.20190809

Cited by 5 publications

(3 citation statements)

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“…The vapor explosion was caused by the evaporation of the cold ethanol droplet within the hot liquid pool (Zhigang . After the crater shrank, part of the initial ethanol droplet gathered on the top of the jet (Fang and Chen, 2019). Furthermore, the ethanol rapidly evaporated into its gaseous phase and created cavities on the glycerol surface when the top of the jet dropped back to the surface level.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…With a small WE, the contact time and area of the droplet and the liquid pool were small, so a large temperature difference was required for the droplet to absorb enough heat to cause a vapor explosion, that is, the critical temperature was high. With the increase of the WE, the contact time and area increased, and the heat absorption increased (Fang and Chen, 2019), vapor explosion could occur at lower liquid pool temperature. Therefore, the critical temperature for vapor explosion decreases with the increase of WE.…”

Section: Critical Temperatures For Two Regionsmentioning

confidence: 99%

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Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Liu

Tang

et al. 2021

Aerosol Air Qual. Res.

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The wall-attached fuel layer of the combustor usually leads to an unstable combustion and produces an unexpected emission, such as aerosol particles and unburn hydrocarbons. In this study, the impaction of ethanol droplet on a heated liquid surface was examined for investigating the factors those could effectively control the fuel atomization and avoided the formation of wall-attached fuel layer. We accelerated the volatilization of ethanol droplets after contacting the liquid surface and even achieved the flash evaporation condition to burst the oil layer, which was conducive to cleaning the inner wall of the combustors and reducing emissions. A 3.12-mm ethanol droplet was used to impact a glycerol pool. The Weber number (WE, 303-1343) and pool temperature (T, 50-260℃) were two controlled parameters to explore the impaction characteristics. There were four typical phenomena observed, including surface dissolving, penetrating dissolution, vapor explosions, and nucleate boiling. Results showed that the maximum volume and surface area of the crater increased with the WE and the liquid pool temperature during impaction. Meanwhile, the boundary temperatures between the penetrating dissolution and the vapor explosion decreased. Additionally, the vapor explosion time increased with the WE but negatively correlated to the liquid pool temperature. The entire vapor explosion process was very short, lasting about 200 millisecond. Furthermore, the increasing WE had a negative effect on the nucleate boiling intensity when the liquid pool temperature significantly enhanced it. Consequently, the fuel droplet atomization and explosion could be sensitively controlled by varying the WE and the temperature of impaction surface. This finding provides valuable information to the designer of combustor control unit to

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Critical Temperatures For Two Regionsmentioning

confidence: 99%

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Liu

Tang

et al. 2021

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

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“…[13][14][15][16] They have focused not only on the dynamic behavior of the crown expansion but also on its morphology and splashing outcome by considering the influence of key parameters, such as the Weber number (We = ρ d v 2 imp d 0 /σ ), Reynolds number (Re = ρ d v imp d 0 /µ), Froude number (Fr = v 2 imp /gd 0 ), Ohnesorge number (Oh = µ/(ρ d d 0 σ ) 0.5 ), impact surface, and droplet and/or liquid film properties. [17][18][19]21,22] Here d 0 , ρ d , v imp , σ , g, and µ are respectively the droplet diameter, density, impact velocity, surface tension coefficient, acceleration of gravity, and dynamic viscosity. A comprehensive review on crown evolution was given by Liang.…”

Section: Introductionmentioning

confidence: 99%

Crown evolution kinematics of a camellia oil droplet impacting on a liquid layer

et al. 2022

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The phenomenon of droplet impact on the immiscible liquid is encountered in a variety of scenarios in nature and industrial production. Despite the exhaustive researches, it is not fully clear how the immiscibility of the droplet with impact liquid affects the crown evolution. The present work experimentally investigates the evolution kinematics of crown formed by a normal impact of camellia oil droplet on immiscible water layer. Based on discussion of dynamic impact behaviors for three critical Weber numbers (We), the radius of crown and its average spreading velocity are compared with those of previous theoretical models to discuss their applicability to the immiscible liquid. The evolution kinematics (morphology and velocity) are analyzed by considering the effects of We and layer thickness. Furthermore, the ability of crown expansion in radical and vertical directions is characterized by a velocity ratio. The results show that our experimental crown radius still follows a square-root function of evolution time, which agrees with the theoretical predictions. The dimensionless average spreading velocity decreases with We and follows a power-law, while the dimensionless average rising velocity remains constant. The velocity ratio is shown to be linearly increasing with We, demonstrating that the rising movement in crown evolution gradually enhances with We. These results are helpful for further investigation on the droplet impact on immiscible liquid layer.

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Numerical study on flow and heat transfer characteristics of two oil droplets impinging the wall simultaneously under the influence of micro-bubble

Zheng

Tong

Zhang

et al. 2022

International Journal of Heat and Mass Transfer

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Temperature charateristics of droplet impacting on static hot pool

Cited by 5 publications

References 0 publications

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Crown evolution kinematics of a camellia oil droplet impacting on a liquid layer

Numerical study on flow and heat transfer characteristics of two oil droplets impinging the wall simultaneously under the influence of micro-bubble

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