| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2015: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
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| Outline of Final Research Achievements |
An universal relation between the friction factor and velocity profile in a pipe flow at high Reynolds number was studied. The most important feature of this experiment is to obtain a flow rate with high accuracy using high Reynolds number actual flow facility. The high accurate flow rate measurement brings a high accurate friction velocity and Reynolds number. The velocity profile was measured using LDV and the measurement results was validated in detail. Especially, we indicated that the friction factor obtained by the direct integration of velocity profile and measurement friction factor by the pressure drop agrees very well. Based on this result, Karman constant which is the inclination in log-law velocity profile, is estimated to be 0.384. This value is nice agreement with the other canonical flows such as boundary layer and channel flow.
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