Thermal flow analysis of temperature-sensitive magnetic fluid around multiple heated bodies

Abstract

When the system proposed by Resler and Rosensweig (1964) is used for heat transfer, it is necessary to efficiently inject heat into the temperature-sensitive magnetic fluid and generate an appropriate self-drive to transport heat. In this paper, assuming that a heat sink is used for heat injection, the heat flow that occurs when multiple heated bodies are arranged in the temperature-sensitive magnetic fluid. The thermal flows around nine heated objects were calculated using a two-dimensional hybrid simulation method based on the lattice Boltzmann method, the finite difference method, and the immersed boundary method. The nine square or circular cylinders were assumed as the heated bodies. The average Nusselt number of each heated object was calculated. From the simulation results, it is shown that the heat transfer performance is better from the downstream objects than that from the upstream objects in case of circular objects. The velocity of the wake is faster than in case of the circular objects than in the case of square objects. In the case of circular objects, heat is trapped between the objects aligned in the flow direction, thus the heat transfer characteristics of square objects are better than that of circular objects.