A liquid in an amount of (25.9-Z) l / s moves through a

A liquid in an amount of (25.9-Z) l / s moves through a pipe with a diameter of 40 mm. Fluid viscosity Ymm2 / s. Find the inner diameter of the hydrodynamic model of the pipe through which 2 l / s of fluid with a viscosity of 1 mm2 / s passes.
Given: dn = 40mm = 0.04m; Qn = (25.9-Z) = 25.9-2 = 23.9 l / s = 0.0239 m3 / s; υн = 6mm2 / s = 6 * 10-6m2 / s; Qm = 2l / s = 0.002m3 / s; υm = 1mm2 / s = 1 * 10-6m2 / s
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