Multiphase model of flow and separation phases in a whirlpool: Advanced simulation and phenomena visualization approach

Stachnik, Marta; Jakubowski, Marek

doi:10.1016/j.jfoodeng.2019.109846

Cited by 34 publications

(26 citation statements)

References 26 publications

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“…For all the simulations carried out, the boundary conditions are assumed as the open boundary with a relative pressure of 0 bar, and the fluid velocity is normal to the boundary surfaces. The boundary condition for the upper wall is a moving wall with no slip condition, while the lower wall is modeled as a fixed wall and no slip condition [23]. The initial conditions are zero fluid velocity and 0 bar relative pressure inside the domain.…”

Section: Single Dimplementioning

confidence: 99%

CFD Analyses of Textured Surfaces for Tribological Improvements in Hydraulic Pumps

et al. 2020

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In any hydraulic machine there are lubricated couplings that could become critical beyond certain operating conditions. This paper presents the simulation results concerning textured surfaces with the aim of improving the performance of lubricated couplings in relative motion. The texturing design requires much care to obtain good improvements, and it is essential to analyze both the geometric features of the dimples and the characteristics of the coupled surfaces, like the sliding velocity and gap height. For this purpose, several CFD simulations have been performed to study the behavior of the fluid bounded in the coupling, considering dimples with different shapes, size, and spatial distribution. The simulations consider the onset of gaseous cavitation to evaluate the influence of this phenomenon on the pressure distribution generated by the textured surface. The analyses have pointed out that it is critical to correctly predict the behavior of the textured surface in the presence of local cavitation, in fact, when cavitation occurs, the characteristic time of the transient in which the phase of the fluid change is very rapid and it is comparable to the time taken by the fluid to move from one dimple to the next.

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Section: Single Dimplementioning

confidence: 99%

CFD Analyses of Textured Surfaces for Tribological Improvements in Hydraulic Pumps

et al. 2020

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Section: Resistance Coefficient Of a Porous Grid Platementioning

confidence: 99%

“…Computational fluid dynamics (CFD) is mainly used for simulating the fluid characteristics; researchers can use self-built models to achieve fast and accurate CFD calculations or take use of commercial finite element analysis software such as Fluent or CFX. Jakubowski et al [28] When flowing through the porous grid plate, the fluid is rectified by the holes to flow along the axial direction. When the fluid flows through the hole, it will be subject to the viscous resistance and inertial resistance.…”

Section: Resistance Coefficient Of a Porous Grid Platementioning

confidence: 99%

Enhancing Flow Field Performance of a Small Circulating Water Channel Based on Porous Grid Plate

2020

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Low-cost and high-efficiency circulating water channels are widely used in the hydrodynamic tests of an underwater device. The current research mainly focuses on obtaining a better velocity uniformity of the test section by optimizing the curve function of the boundary in the contraction section. While, for small underwater device, their hydrodynamic characteristics are sensitive to turbulence. Thus, the circulating water channel, which can obtain the required turbulence characteristics, is urgently needed. A small circulating water channel, which can reduce the turbulence intensity based on a porous grid plate and can be used to test the hydrodynamic characteristics of a small underwater device, is designed. The relationships between porosities and resistance coefficients of a porous grid plate are established. The effects of the honeycomb (porosity and thickness); screen (porosity, number of layers, and spacing); and pumping flow rate on the turbulent characteristics of the test section are studied. The relationships between the parameters and the turbulent characteristics of the test section are established, and the methods to achieve the required flow characteristics of the test section are proposed. Experiments are carried out, and the validity of the obtained results is verified. In this work, the turbulence intensity of the fluid field in the test section can be restrained to 0.0491, which is enough to meet the turbulence requirements for the hydrodynamic test of a small underwater device. This work can provide references for the construction of a hydrodynamic test platform for small underwater devices.

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“…The settings of pumps for the transport of wort and waste, e.g., hot trub, also depend on the rheological properties. Many studies have already discussed the phenomenon occurring in the whirlpool and hot trub forming a cone [ 33 , 34 , 35 ]. However, there are no preliminary studies on the rheological properties of hot trub and hops.…”

Section: Introductionmentioning

confidence: 99%

Rheological and Microbiological Characteristics of Hops and Hot Trub Particles Formed during Beer Production

2021

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During the production of beer, and especially beer wort, the main wastes are spent grain and hot trub, i.e., the so-called “hot break.” Combined with yeast after fermentation, they represent the most valuable wastes. Hot trub is also one of the most valuable by-products. Studies on the chemical composition of these sediments and their rheological properties as waste products will contribute to their effective disposal and even further use as valuable pharmaceutical and cosmetic raw materials. So far, hot trub has been studied for morphology and particle distribution depending on the raw material composition and beer wort extract. However, there are no preliminary studies on the rheological properties of hot trub and hops. In particular, no attention has yet been paid to the dependence of these properties on the hop variety or different protein sources used. The aim of this study was to examine the effect of different hopping methods on hot trub viscosity and beer wort physicochemical parameters. Additionally, the hop solutions were measured at different temperatures. A microbiological analysis of hop sediments was also performed to determine the post-process survival of selected microorganisms in these wastes. For manufacturers of pumps used in the brewing industry, the most convenient material is that of the lowest viscosity. Low viscosity hot trub can be removed at lower velocities, which reduces costs and simplifies washing and transport. The sediments also had similar equilibrium viscosity values at high shear rates.

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Multiphase model of flow and separation phases in a whirlpool: Advanced simulation and phenomena visualization approach

Cited by 34 publications

References 26 publications

CFD Analyses of Textured Surfaces for Tribological Improvements in Hydraulic Pumps

CFD Analyses of Textured Surfaces for Tribological Improvements in Hydraulic Pumps

Enhancing Flow Field Performance of a Small Circulating Water Channel Based on Porous Grid Plate

Rheological and Microbiological Characteristics of Hops and Hot Trub Particles Formed during Beer Production

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