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Belt, R.J. (author), Daalmans, A.C.L.M. (author), Portela, L.M. (author)In fully developed single-phase turbulent flow in straight pipes, it is known that mean motions can occur in the plane of the pipe cross-section, when the cross-section is non-circular, or when the wall roughness is non-uniform around the circumference of a circular pipe. This phenomenon is known as secondary flow of the second kind and is...journal article 2012