Effect of enamel coating on boat hull drag | |
| Author | Wu, Ming |
| Call Number | AIT Thesis no. AE-90-02 |
| Subject(s) | Hulls (Naval architecture) Enamel and enameling |
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The effect of enamel coating on boat hull drag was studied by using four different shaped boats. The performance of enamel coated boats was compared with the same shaped uncoated boats. The effect of speed was evaluated by varying the boat speeds to 2.3, 2.5 and 2.8 m/s. Similarly the effect of load was studied by varying loads to 180, 200 and 250 N. The drag required to pull these boats in the laboratory water tank was measured by a load transducer. It was observed that increases in boat speed and load increased the drag requirements of the both uncoated and enamel coated boats. However, in almost all tests the drag force for enamel coated boats was lower than the same shaped uncoated boat. A maximum reduction of 15% for Model-1 boat at 2.8 m/s speed and 180 N load was recorded. In general it was observed that Model-1 was the most efficient compared to other models. It required less drag than the other models. It was observed that an increase in Froude number either increased or decreased the drag coefficient for different models. The ratio of drag force/normal load was found to be a function of Froude number as well as shape of the boats. For Model-1 boat the drag coefficient was almost the same for the range of Reynolds number tested. However it was found to be a strong function of Reynolds number for other models. In general it was found that enamel coating can be used to reduce the drag of boats in certain working condition . The shape of the boat was found to be a significant factor at higher normal load and speed. Due to irregular boat shapes used in this study the benefits of coating were reduced by early bound layer separation. Therefore streamline boats will be helped by the enamel coating which may reduce the friction considerably. |
| Year | 1990 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Salokhe, Vilas M. ;Gee-Clough, D. |
| Examination Committee(s) | Singh, Gajendra ;Gupta, Ashim Das |
| Scholarship Donor(s) | The Government of Australia |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |