title: Comment on "Structure of ferrofluid dynamics".
abstract: We compare known equations for ferrofluid magnetization with a recently proposed rectified Debye theory [H. W. Müller and M. Liu, Phys. Rev. E 64, 061405 (2001)] and demonstrate that the latter is unsatisfactory. Derived by a purely formal method, it contains numerous unknown parameters, fails to explain previous experiments, and has no heuristic force.
authors.affiliation: Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel. shliomis@bgumail.bgu.ac.il
authors.forename: Mark I
authors.initials: MI
authors.lastname: Shliomis