Flow Hydrodynamics of non-Newtonian Fluid in a Cylindrical-Conical Hydrocyclone

Analysis of influence exerted by structural and regime parameters of cylindrical hydrocyclones on degassing efficiency of non-Newtonian media on the basis of regression model

“…2a, it is possible to establish that the degree of extraction S increases over the entire height of the effective space of the hydrocyclone with increasing Fr number, particularly rapidly when Z = 4-12; for high Fr numbers, therefore, the length of the effective section of the hydrocyclone can be restricted to Z e = 5-10. This increase in degree of extraction S is explained by an increase in the circumferential velocity component v ϕl of the liquid, which leads to an increase in the circumferential velocity component v ϕg of the gas bubbles; this is accompanied by a corresponding increase in the Re ng number, and, a more rapid emergence of gas bubbles as foam on the surface of the film is ensured despite an increase in the film thickness of the suspension [7]. It follows from analysis of the curves shown in Fig.…”

“…It follows from analysis of the curves shown in Fig. 2b that the degree of extraction S increases over the entire height of the effective space of the hydrocyclone with increasing Re n number owing to thickening of the liquid film [7], and an increase in the circumferential velocity component v ϕl of the liquid and the velocity v ϕg of the gas bubbles; this gives rise to an increase in the Re ng number.…”

“…In [7], the problem of simulating the film flow of a non-Newtonian liquid in a cylindrical hydrocyclone was solved by the numerical method using complete equations of rheodynamics; this served as the basis for subsequent modeling of various separation processes in a hydrocyclone.…”

“…Here, spinning film 7 is formed. Gas bubbles 2 are extracted as a foam layer under the action of the Archimedes centripetal force on the surface of the film at a velocity, the radial component v rg of which is directed toward the axis of the hydrocyclone, and the circumferential v ϕg and axial v zg components of which are assumed equal to the corresponding velocity components v ϕl and v zl of the liquid [7]. The liquid, which has been cleaned of gas bubbles, is removed via lower overflow 1 of the hydrocyclone, while the foam is withdrawn through upper discharge pipe 4.…”

“…When calculations were performed on the basis of formula (1), the axial velocity component H g of the gas bubbles was assumed equal to the axial velocity component H l of the dispersion medium [7], since the inertia of the gas bubbles in the axial direction was disregarded in performing the calculations in [8,9].…”