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| Theoretical analysis on internal flow field of separation space in cyclone separators |
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CHEN Jian-yi1,2,LUO Xiao-lan1,2,SHI Ming-xian2
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(1.College of Mechanical and Electronic Engineering in China University of Petroleum，Dongying 257061, Shandong Province, China ;2.State Key Laboratory of Heavy Oil Processing in China University of Petroleum，Beijing 102249，China )
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| Abstract: |
| A set of simplified gas motion equations for the internal flow in a cyclone separator was established with the algebraic eddy viscosity model. A semi-empirical three-dimensional velocity solution to the simplified equations for the separation space was deduced using the assumed axial or radial velocity profile. The solution agrees fairly well with the measured velocity distributions. The wall tangential velocity and the radius of the dividing surface between the quasi-free and quasi-forced vortex flow, which were the two key variables in the solution, were determined using the theory of inlet jet contraction and the principle of minimum pressure drop respectively. Based on the semi-empirical solution, the distributions of the characteristic length scale of turbulence, e. , the Prandtl mixing length and the Kolmogorov scale, were analyzed. The predicted distributions of the above two scales in cyclones were also in good agreement with the measured ones. |
| Key words: cyclone separator flow field Prandtl mixing length Kolmogorov scale |
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