CFD Simulation of Mixing in Rotary Energy Recovery Device

In desalination, the rotary energy recovery device (RERD) is commonly used to reduce system energy usage. Simulation was used to examine the fluid dynamics and mixing performance of a standard structure RERD and a visualisation apparatus of an RERD (V-RERD) in this work. It had been studied the influence of rotating components on fluid dynamics and mixing. The flow fields in the device duct show a whirling flow, according to simulation results. The swirling flow changed its rotating direction near the centre of the duct in the RERD example, whereas it remained unchanged in the V-RERD case. Then, to quantify the degree of swirl intensity, a swirling number Sn was employed, and the formation mechanism in RERD was discussed. The Q criteria was also used to view three-dimensional flow configurations and locate vortex forms in the duct. The evolution of vortices during the manufacturing process was studied. Vortices were discovered to have a substantial impact on mixing performance, and a detached vortex could cause excessive turbulence and mixing in the duct. Reduced flow turbulence and a reduced volumetric mixing rate can be achieved by suppressing vortex shedding.

Author(s) Details

Kai Liu
College of Petroleum Engineering, Yangtze University, Wuhan 430100, China.
School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China.

Lixing Zheng
School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China.
School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030013, China.

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