Patent ID: 8256846

Claim:
A dimpled lifting pipe for mining deep-sea mineral resources, the dimpled lifting pipe being used in a manganese nodule mining system including a collection device for collecting deep-sea manganese nodules and a lifting pump, wherein dimples are formed on an outer circumferential surface of the dimpled lifting pipe, so that turbulent flows are generated, thereby reducing drag caused by ocean currents of a deep sea, wherein the dimples are formed such that 12 dimples are arranged in a plurality of rows and arranged in each row at angular intervals of 30 degrees on the circumferential surface of the lifting pipe of a specific size, wherein the dimples are formed such that on a basis of a specific diameter of the lifting pipe, a diameter of the dimples has a value that is obtained by dividing a circumference of the lifting pipe by 24, wherein the dimples are formed such that a drag coefficient is 0.9, which is less than a drag coefficient of a smooth cylinder, that is, 1, at Reynolds number=2000, and wherein the dimples are formed at a ratio at which a depth thereof is in a range of 0.15-0.35 cm when a diameter thereof is 1 cm.