Response to "Comment on 'Surface switching of rotating fluid in a cylinder"' [Phys. Fluids 19, 069101 (2007)]

In our Letter [T. Suzuki, M. Iima, and Y. Hayase, "Surface switching of rotating fluid in a cylinder," Phys. Fluids 18, 101701 (2006)], we reported a surface switching phenomenon of fluid in a cylinder driven by the endwall rotation. In the Comment by Vatistas [G. Vatistas, "Comment on 'Surface switching of rotating fluid in a cylinder'," Phys. Fluids 19, 069101 (2007)], the author claims that a periodic sloshing phenomenon reported by Vatistas in 1990 is the same phenomenon as the surface switching. We clarify the difference between these phenomena in terms of the parameters, the phenomena, the boundary condition, and the physical mechanism. (c) 2007 American Institute of Physics.