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| A drop contact angle estimation method based on balance principle |
| GUAN Xiao-dong,DI Jiu-sheng |
| Department of Mechanical Engineering, Chengde Petroleum College, Chengde, Hebei 067000, China |
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Abstract A novel drop surface curve function is deduced based on the force balance principle, and the parameter of the function is acquired exploiting samples from the real image of the drop. The Newton-Raphson method is adopted to realize the curve fitting. Then a contact angle estimation method is proposed based on the novel function, forming a drop contact angle estimation method based on balance principle. The experiments are carried out by testing the image using JGW-360A contact angle measurement instrument for water drop with different materials. Canny method is adopted to acquire the edge of the drop to obtain the edge samples. Then the method is exploited to calculate the contact angle based on these samples. The method has been compared with the traditional image analysis methods. Results show that the method is the effective with a difference of 0.2°~0.3° from the traditional methods.
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Received: 20 August 2015
Published: 28 February 2017
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2017, Vol. 38 
