scholarly journals Maximum spreading of an impacting air-in-liquid compound drop

2021 ◽  
Vol 33 (6) ◽  
pp. 061703
Author(s):  
Yu Wei ◽  
Marie-Jean Thoraval
Keyword(s):  
Maximum Spreading

A Study on Evolution of Splat Radius and Temperature in Thermal Spray Process

2018 ◽  
Author(s):  
Manpreet Dash ◽  
Sangharsh Kumar ◽  
Partha Pratim Bandyopadhyay ◽  
Anandaroop Bhattacharya
Keyword(s):  
Heat Transfer ◽  
Thermal Spray ◽  
Molten Metal ◽  
Spray Deposition ◽  
Substrate Surface ◽  
Metal Droplet ◽  
Droplet Impingement ◽  
Impact Process ◽  
The Impact ◽  
Maximum Spreading

The impact process of a molten metal droplet impinging on a solid substrate surface is encountered in several technological applications such as ink-jet printing, spray cooling, coating processes, spray deposition of metal alloys, thermal spray coatings, manufacturing processes and fabrication and in industrial applications concerning thermal spray processes. Deposition of a molten material or metal in form of a droplet on a substrate surface by propelling it towards it forms the core of the spraying process. During the impact process, the molten metal droplet spreads radially and simultaneously starts losing heat due to heat transfer to the substrate surface. The associated heat transfer influences impingement behavior. The physics of droplet impingement is not only related to the fluid dynamics, but also to the respective interfacial properties of solid and liquid. For most applications, maximum spreading diameter of the splat is considered to be an important factor for droplet impingement on solid surfaces. In the present study, we have developed a model for droplet impingement based on energy conservation principle to predict the maximum spreading radius and the radius as a function of time. Further, we have used the radius as a function of time in the heat transfer equations and to study the evolution of splat-temperature and predict the spreading factor and the spreading time and mathematically correlate them to the spraying parameters and material properties.

Maximum spreading of a ferrofluid droplet under the effect of magnetic field

2018 ◽  
Vol 30 (7) ◽  
pp. 077102 ◽  
Author(s):  
Abrar Ahmed ◽  
Brian A. Fleck ◽  
Prashant R. Waghmare
Keyword(s):  
Magnetic Field ◽  
Maximum Spreading

scholarly journals Analysis of Oil Droplet Deposition Characteristics and Determination of Impact State Criterion in Aero-Engine Bearing Chamber

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 741
Author(s):  
Fei Wang ◽  
Lin Wang ◽  
Guoding Chen
Keyword(s):  
Impact Velocity ◽  
Incident Angle ◽  
Droplet Diameter ◽  
Oil Droplets ◽  
Oil Droplet ◽  
Spreading Width ◽  
The Impact ◽  
State Criterion ◽  
Maximum Spreading

The research of oil/air two-phase flow and heat transfer is the fundamental work of the design of lubrication and heat transfer in aero-engine bearing chamber. The determination of impact state criterion of the moving oil droplets with the wall and the analysis of oil droplet deposition characteristics are important components. In this paper, the numerical analysis model of the impact between the moving oil droplet and the wall is established by using the finite volume method, and the simulation of oil droplet impingement on the wall is carried out. Then the effects of oil droplet diameter, impact velocity, and incident angle on the characteristic parameters of impact state are discussed. The characteristic parameters include the maximum spreading length, the maximum spreading width, and the number of splashing oil droplets. Lastly the calculation results are verified through comparing with the experimental results in the literature. The results show as follows: (1) The maximum spreading width of oil droplet firstly increases and then slows down with the incident angle and the oil droplet diameter increasing; (2) when the oil droplet diameter becomes small, the influence of the incident angle on the maximum spreading length of oil droplet is obvious and vice versa; (3) with the impact velocity and diameter of oil droplet increasing, the maximum spreading width of oil droplet increases firstly and then slows down, and the maximum spreading length increased gradually; (4) the number of splashing oil droplets increases with the incident angle and impact velocity increasing; and (5) compared with the experimental data in literature, the critical dimensionless splashing coefficient K c proposed in this paper can better distinguish the impact state of oil droplet.

Modeling the Maximum Spreading of Liquid Droplets Impacting Wetting and Nonwetting Surfaces

Langmuir ◽  
2016 ◽  
Vol 32 (5) ◽  
pp. 1299-1308 ◽  
Author(s):  
Jae Bong Lee ◽  
Dominique Derome ◽  
Robert Guyer ◽  
Jan Carmeliet
Keyword(s):  
Liquid Droplets ◽  
Maximum Spreading

The Effect of the Surface Inclination on the Hydrodynamics and Thermodynamics of Leidenfrost Droplets

2014 ◽  
Vol 30 (2) ◽  
pp. 145-151 ◽  
Author(s):  
P. Pournaderi ◽  
A. R. Pishevar
Keyword(s):  
Contact Time ◽  
Heat Removal ◽  
Total Heat ◽  
Vapor Layer ◽  
Accurate Calculation ◽  
Simulation Process ◽  
Mesh Resolution ◽  
Surface Inclination ◽  
Hot Surface ◽  
Maximum Spreading

ABSTRACTIn this research, the effect of the surface inclination on the hydrodynamics and heat transfer of droplets impinging on very hot surfaces is studied. The applied numerical algorithm is based on the accurate calculation of the vaporization rate in the simulation process using a combination of the level set and ghost fluid methods. Also a mesh clustering technique is utilized to create sufficient mesh resolution near the surface in order to take into account the effect of the thin vapor layer between droplet and very hot surface. The results are verified against available experiments. The effect of the surface inclination on the droplet maximum spreading radius, droplet contact time and total heat removal from the surface is considered. Results show that for the studied regime, the maximum spreading radius of the droplet is decreased with an increase in the surface inclination while the droplet contact time on the surface is independent from the surface inclination. For inclinations greater than 45°, the total heat removal is decreased considerably with an increase in the inclination angle. For smaller inclinations, the dependency of the total heat removal on the surface inclination is not strong.

scholarly journals A Maximum Spreading Speed for Magnetopause Reconnection

2018 ◽  
Vol 45 (11) ◽  
pp. 5268-5273 ◽  
Author(s):  
B. M. Walsh ◽  
D. T. Welling ◽  
Y. Zou ◽  
Y. Nishimura
Keyword(s):  
Spreading Speed ◽  
Maximum Spreading ◽  
Magnetopause Reconnection
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