University of Twente Student Theses


Surface wettability investigation of the CVT components

Abbas, Y. (2018) Surface wettability investigation of the CVT components.

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Abstract:A step wise approach is followed in this report. First, the governing principle of a wetting behavior is explained followed by the key factors that play a role in wetting behavior of a liquid when it encounters a certain surface. Then the wettability of CVT components are determined by performing contact angle measurements. Considering results obtained from the contract angle measurements the contact with maximum potential of improvement from wettability point of view is chosen for surface modification. Different surface modification techniques are explored and after through literature study and taking into consideration the operating conditions of the CVT belt EDM technique is proposed to construct the desired surface geometry on the test specimen. It is also recommended to explore suitable surface coatings in the future that can be used on top of the constructed surface geometry to achieve a robust wetting behavior. The design parameters for the desired surface geometry are carefully chosen after thorough investigation of the key parameters required for achieving oleophobic behavior. Finally, three design profiles for three different wire diameters were proposed and one design profile was investigated for mechanical robustness. It can be concluded that even though oleophobic behavior can be achieved with the proposed designs, appropriate surface coating is necessary to achieve oleophobic behavior for element-pulley contact in CVT working conditions.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Programme:Mechanical Engineering MSc (60439)
Keywords:Continuous variable transmission, Surface wettability, Oleophobicity, Diamond like coating
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