Effect of surface treatment on drag coefficient of free-falling solid sphere in water

M. Sofwan Mohamad, C. M.Mackenzie Dover, K. Sefiane

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


The study aims to examine the influence of different surface treatments on the drag coefficient of free-falling spheres in water. The spheres used in the experiment are classified into four categories and labelled as: ref - no surface treatment, FDTS - coated with hydrophobic perfluorodecyltrichlorosilane (FDTS) coating, E8 - 8 minutes etched in ferric chloride (FeCl3) and E32 - 32 minutes etched in FeCl3. No significant difference is observed in drag coefficient of the etched spheres compare with the reference sphere. However, the FDTS sphere's drag coefficient was increased by 13%.

Original languageEnglish (US)
Article number012067
JournalIOP Conference Series: Materials Science and Engineering
Issue number1
StatePublished - Dec 2 2019
Externally publishedYes
Event6th International Conference on Applications and Design in Mechanical Engineering 2019, ICADME 2019 - Penang Island, Malaysia
Duration: Aug 26 2019Aug 27 2019

Bibliographical note

Funding Information:
The author acknowledge the financial support from Kementerian Pendidikan Malaysia and Universiti Malaysia Perlis for the sponsorship which enable me to pursue this study. MEMSstar Ltd. is gratefully acknowledged for the coating. The author would like to thank Mr. Alan Ross at the Scottish Microelectronics Centre (SMC) for the help with sample preparation.

Publisher Copyright:
© Published under licence by IOP Publishing Ltd.


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