Assessment of direct image processing methods to measure the apparent contact angle of liquid drops

作者：Biole D; Wang M; Bertola V

来源：Experimental Thermal and Fluid Science, 2016, 76: 296-305.

DOI：10.1016/j.expthermflusci.2016.04.006

• Dynamic contact angle
• Digital images
• Non-axisymmetric drops

Four methods to measure apparent contact angles of non-axisymmetric drops are analyzed critically. In particular, methods based on local edge interpolation or fitting are compared with direct image processing methods, based on image filtering with a suitable sampling mask. The methods performance is evaluated based on the dynamic contact angle of a dilute polymer solution drop impacting on a solid substrate. Results show that direct image processing methods yield an overall better performance, with a good compromise between measurement accuracy and computational cost, and have a limited dependence on the choice of parameters. Polynomial edge fitting yields the worst performance, both in terms of accuracy and in terms of computational cost.

• 出版日期2016-9
• 单位清华大学