SPH Simulations of Drop Impact on Heated Walls and Determination of Impact Criteria

Characterization of fuel drop impact on wall films using SPH simulation

“…[40][41][42] However, for a thick film (e.g., d ø 0.2), the impact outcome will depend only on film thickness, and the proposed splash criterion agrees with the experimental data. As discussed in our previous study, 38 the engine piston has a rough surface, indicating that the proposed splash criterion is suitable for engine spray/wall impingement simulation.…”

“…22 The proposed SPH method has been used to determine the splash threshold, determined by an impact parameter K = W e 0 . 5 R e 0 . 25 , for drop impact on a dry wall. 38,39 A correlation, which considers the effects of wall temperature ( T w ), was derived. 39…”

Particle-based approach to model fuel droplet impact and thermal spray coating processes

“…This model uses the concept of impingement frequency from Yarin and Weiss [19]; this frequency is calculated as the inverse of the time between droplet impacts but defined it as f = Vnd / dd, where Vnd and dd are the droplet's normal component of velocity and droplet diameter, respectively, for the first droplet. Liang and Mudawar [50] and Pan et al [13] later verified that the K parameter proposed by Mundo et al [25] provides a better prediction for the splashing dynamics than the Weber number alone. Richter et al [51] probed the temporal interaction of the successive iso-octane droplets impacting a heated piston surface and presented the effects of this temporal interaction on secondary droplet characteristics at different impingement frequencies and wall temperatures.…”

“…By combining the heat transfer regimes and hydrodynamic behaviors, the outcomes of the single drop impact have been categorized into four major regimes, namely deposition, contact splash, rebound, and film splash [13,14]. In the deposition regime, the liquid drop stays in contact with the surface and evaporates subsequently, whereas the liquid drop splashes and forms a thin liquid film on the surface in the contact splash regime.…”

SPH simulation of YSZ and stainless-steel droplet impact for thermal spray process

“…The SPH method is a mesh-free Lagrangian method for simulating fluid flows and natural phenomena that involve complex deformations, free surface flows, and moving particles. Because of its advantage, the SPH method has been applied to study various multiphase fluid problems [18,[20][21][22][23][24][25][39][40][41][42][43][44]. The SPH method was applied to investigate the effects of contact angle and surface tension on the outcome of the YSZ droplet impact [20]; they found that the impact angle is less than 44°, and the droplet splash occurred.…”