%0 Journal Article
%T Investigation of friction power consumption and performance of a water turbine seal based on the imbalanced rotation of nano
%A Bo Li
%A Deyou Li
%A Fengyu Yang
%A Jiarong Zhang
%A Xin Chai
%A Zhenggui Li
%J Advances in Mechanical Engineering
%@ 1687-8140
%D 2018
%R 10.1177/1687814018772369
%X The calculation of friction power consumption and the performance of nano-magnetic fluids in sealed water turbines have proved to be hurdles in studies on nano-magnetic fluidic device designs and applications. In this article, we investigate the imbalanced rotation ¦¸£¿¡Ù£¿1/2 (rot ¦Ô) of a nano-magnetic fluid suspended in a paramagnetic carrier liquid. Through Langevin and Navier¨CStokes equations, the formula for the theoretical friction power consumption can be calculated for the magnetic particles in the nano-magnetic fluid. The calculated value shows a well agreement with the test result. Further simulation indicates that the magnetic field gradient ¦¤Bsum between the tooth space (wave trough) and the pole tooth (wave crest) has the most influence on the imbalanced rotation in a sealed nano-magnetic fluid device in a water turbine. Specifically, the larger the ¦¤Bsum, the more obviously imbalanced the nano-magnetic fluid rotation will be at that location; and the imbalanced torque will be larger, so the seal differential pressure will be as well. As a result, the sealing capacity will be better and the frictional power consumption will be larger; and the reverse is also true. This study result can serve as a reference for designs for sealed nano-magnetic fluidic devices for water turbines, which is significant, especially given the heat from friction power consumption in the water turbine and its cooling equipment
%K Nano-magnetic fluid
%K imbalanced rotation
%K sealed water turbine
%K friction power consumption
%U https://journals.sagepub.com/doi/full/10.1177/1687814018772369