Hi everybody, Does anybody has idea about finding "Contact angle". I need to model capilary effect for water. and I require contact angle. Please let me know the required inputs for that. I thank you all for taking interest in this issue.

Hi John,

the contact angle depends on used material and surface stucture. You can only meassure these data for your case. Look at http://en.wikipedia.org/wiki/Contact_angle for further information.

Frank

Hi Frank Weise. Thank you very much. But I do not have any data. Is it possible to get contact angle based on material. I need contact angle for Water,glass,air. Infact, I have 0.1 mm gap between two slides and I have to model capilary. I have been using water-air mixture. i have also one doubt.-->>>Do I need to know contact angle for all materials? Thanks again.

You have only one contact angle for these 3 elements. http://en.wikipedia.org/wiki/Capillary_action

Hi Frank Weise,

Thank you very much. SO, does that mean I need to define only single contact angle? And If I am not wrong then, this should define at wall BC. Am I right?? Kindly correct me, if I am wrong. Please, also let me know, does that mean, contact anlge does not depend on volume fraction. Its a material property.