Affiliations: [a] National Engieering Research Center for Equipment and
Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao, Hebei,
China
Correspondence:
[*]
Corresponding author: Hongliang Zhou, National Engieering
Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan
University, Qinhuangdao, Hebei, China. Tel.: +86 132 3092 0421; Fax: +86 335
838 7785; E-mail: [email protected]
Abstract: Magnetorheological fluid (MRF) exhibits drastic changes in
rheological properties adjustable and controllable yield stress under external
magnetic field. Based on its specialty, the MRF seal technique is proposed to
deal with the air leakage of circular cooler to improve the energy efficiency
for the steel industry. MRF is regarded as Bingham fluid with its magnetization
vector and magnetic force expressed by mathematical functions. The FEM analysis
results show that, under magnetic field, MRF which presents good pressure
resistance as a result of its yield stress is in a dynamic equilibrium state in
non-magnetic seal groove even with pressure difference, and due to the volume
force, it presents unsteady swirl flow obviously at the right-angle edges of
the two permanent magnets nearby non-magnetic separator, whereas, due to
pressure difference, it shows an obvious flow without magnetic field. In the
meantime, according to the experiment, it indicates that the air leakage of
circular cooler is solvable effectively with the MRF seal method, and it is
also proved that MRF shows controllable yield stress under magnetic field.
Keywords: FEM analysis, yield stress, magnetic field, MRF seal, experiment
