FIR Theory

Friction resistance is mainly attributed to the roughness of coating surfaces. Normally roughness control of ship bottom paint surface is conducted by measuring the roughness height (peak height). However, double cylinder tests conducted by Tokyo University of Science, flow simulations by Tokyo University of Agriculture and Technology using a supercomputer, and tank tests by National Maritime Research Institute (NMRI) using ultra high precision parallel plates indicate significant contribution of the roughness wavelength (distance between peaks) to the friction resistance.
Reducing fuel consumption by ships contributes to the preservation of finite resources on the earth and reduction in CO2 emissions. CMP further progress fuel-saving effects by using the FIR Theory as the indicator.

Reducing friction resistance of the hull bottom leads to fuel saving.

The reduction technology of friction resistance by anti-fouling paint is gaining more expectations under the circumstances of environmental regulations for ships, e.g. EEDI (IMO: Energy Efficiency Design Index), since it is claimed that the friction resistance is about 60-80% in total hull resistance which greatly affects the fuel consumption of vessels.

Correlation between roughness, wavelength and fuel-saving effect


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