We investigate the mixing and heat transfer enhancement in a two rod mixer for a highly viscous fluid. The mixer is composed of two circular rods maintained vertically in a cylindrical tank. The rods and tank can rotate around their revolution axis. Chaotic flows are obtained by imposing temporal modulations of the rotational wall velocities. The fluid is incompressible, Newtonian and the thermophysical properties, at first approximation, are kept constant with temperature. We study the effect of different stirring protocols and flow configurations leading to chaotic flows on the efficiency of mixing and heat transfer for the particular wall boundary condition of constant heat flux (i.e. Neumann condition). For this purpose we use different statistical indicators as tools to characterize the mean value of fluid temperature and its homogenization. The results show a significant enhancement of heat transfer for the case of an alternated stirring protocol (a result we have already obtained for the constant wall temperature boundary condition [1]).

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