Abstract
The rotary energy recovery device (RERD) is widely equipped in desalination to reduce the system energy consumption. In this study, the fluid dynamics and mixing performance of a typical structure RERD and a visualization apparatus of a RERD (V-RERD) had been compared by simulation. The effects of rotating components on fluid dynamics and mixing had been researched. Simulation results indicated that a swirling flow can be observed from flow fields in the device duct. In the RERD case, the swirling flow changed its rotating direction in the center of the duct, while in the V-RERD case, its rotating direction was unchanged. Then, a swirling number Sn was applied to characterize the degree of swirl intensity, and its formation mechanism in RERD had been discussed. In addition, the Q criterion was adopted to visualize the three-dimensional flow structures and identify vortex structures in the duct. The evolution of vortices in the working process had been investigated. It was found that vortices significantly affected the mixing performance, and the detached vortex could lead to high turbulence and mixing in the duct. Suppressing the vortex shedding may reduce the flow turbulence and gain a lower volumetric mixing rate.
Highlights
With the rapid growth of the population and the development of industry, an increase in global water usage is expected
Besides the two different components, its structure was the same as that of the typical recovery device (RERD). It has the same working principle and working stages as the typical RERD. In those studies [6, 16, 17], by applying two-dimensional (2D) PIV experiments, we found a high turbulence intensity related to the vortex formation at the visualization apparatus of a RERD (V-RERD) duct entrance; in the numerical research, we observed a swirling flow formed in the duct
A swirling flow was confirmed in the two devices’ dust, which had a significant effect on the fluid dynamics
Summary
With the rapid growth of the population and the development of industry, an increase in global water usage is expected. The mechanism of the mixing process and the salinity concentration distribution in the RERD has attracted much interest in recent years, but it is still not fully clear Those studies [11,12,13,14,15] have difficulty in validating their simulation results, especially the flow pattern and mixing process, with comparative experimental data. It has the same working principle and working stages as the typical RERD In those studies [6, 16, 17], by applying two-dimensional (2D) PIV experiments, we found a high turbulence intensity related to the vortex formation at the V-RERD duct entrance; in the numerical research, we observed a swirling flow formed in the duct.
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