Abstract
The relations between the drag coefficient C of lattice of many parallel circular cylinders and Reynolds number R were studied experimentally. The drag of the specimen falling in a tower was measured in the region of R =ca 0.25∼1.0. If C vs R curve of a cylinder by Wieselsberger is used as standard, C vs R relations of lattice are approximately the same as Wieselsberger's, when h / d =250 and 125, with d being the diameter of the cylinder, and h the distance of the centers of the two cylinders. Accordingly it is seen that Imai's formula on the basis of the combination of Stokes' and Oseen's approximations is better than Tomotika and Aoi's formula on the basis of Oseen's. The C vs R relations of lattice, when h / d =50, 25 and 12.5, are somewhat similar to Fujikawa's C vs R curves of two parallel cylinders.
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