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Experimental investigation on the heat transfer performance of Galinstan liquid metal driven by electromagnetism

Liquid metals have excellent heat transfer performance and unique electromagnetic characteristics, providing new visions for cooling the high-speed motorized spindle shaft. Liquid metal can be driven by the magnetic field of the motor stator to induce current with no dynamic seal problem. In the present study, a shaft cooling structure of a motorized spindle with Galinstan liquid metal as the working fluid was designed and the heat transfer performance of the designed structure was investigated experimentally. The obtained results at the rated speed and rated current show that the induced voltage in the wire installed on the shaft reaches 1.2V, which can circulate the liquid metal in an 8 mm diameter copper pipe. In this case, its equivalent thermal conductivity reaches 8.1*104 W•m-1•ºC-1, which can effectively reduce the temperature of the motorized spindle rotor and make the temperature distribution of the motorized spindle more uniform.
PAPER REVISED: 2023-10-23
PAPER ACCEPTED: 2023-11-01
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