Prediction of Postcontact Parameters of Fluid Droplet Impact on a Smooth Surface

摘要

Liquid drop impact, spread, and surface coating is critical in wing icing, combustor liner cooling, and other aerospace applications. This study reports an investigation of droplet impact on a smooth quartz surface and formulates new data correlations with extensive error assessment. Several previous models were compared with the experimentally obtained results for droplet maximum spread over a wide range: 1) impact speeds (1.2 < V < 3.1 m/s), 2) initial droplet diameter (2.7 < D < 4.0 mm), and 3) Reynolds and Weber numbers (4500 < Re < 13,700 and 80 < We < 510). Droplet images were collected using a high-speed digital camera recording at ～2500 frames per second with an image plane spatial resolution of ～16 μm. Based on the large amount of data collected, a statistical analysis was performed to account for error contribution in model prediction and to determine experimental repeatability. Relative mean error in model prediction ranged from 81.3 to 4.0%. Comparison of maximum spread tune models with experimental spread times was also made and an improved model that decreases error by a factor of 2 is presented.