TY - JOUR
TI - Parameter optimization of anti crystallization flocking drainage pipe based on flow field distribution characteristics
AU - Liu Shiyang
AU - Xiang Kun
AU - Gao Feng
AU - Zhang Xuefu
AU - Li Yun
AU - Omar Khairi Mohamed
JN - Thermal Science
PY - 2021
VL - 25
IS - 6
SP - 4091
EP - 4098
PT - Article
AB - The crystal plugging of tunnel drainage pipe seriously affects the safe and  normal use of the tunnel. In order to obtain the mechanism of flocking  drainage pipe anti crystal plugging based on the characteristics of flow  field distribution, numerical simulation was used to optimize the parameters  of flocking drainage pipe. The results show that: with the existence of  fluff, the velocity in the lower part of the drainage pipe decreases by  about 50%, and the velocity in the upper part increases by about 25~50%.  With the increase of the length of fluff, the velocity funnel between  fluffs gradually increases, the velocity distribution at the bottom of the  funnel is basically unchanged, and the velocity in the upper part gradually  increases. The velocity in the upper part of the flocked drainage pipe  fluctuates above the fluff to a certain extent. The flow velocity in the  lower part of the drainage pipe forms a flow velocity ladder in the  longitudinal direction of the villus, and the width of the ladder is about  2/3 of the longitudinal spacing of the villus. The optimized parameters of  3-D flow field of flocked drainage pipe are helpful to the further  improvement of indoor test, and provide theoretical basis for the mechanism  of preventing crystal blockage of flocked drainage pipe.