Simulation and experimental research on the flow inside a whirlpool separator

Jakubowski, Marek; Sterczyska, Monika; Matysko, R.; Poreda, Aleksander

doi:10.1016/j.jfoodeng.2014.02.011

Cited by 23 publications

(13 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is because of the fact that two different transport equations characterise two independent properties of the turbulent flow. Moreover, it is robust, economical, and reasonably accurate for a large variety of turbulent flows [58,59]. Turbulence kinetic energy is described by Equation 11:…”

Section: Mathematical Modelmentioning

confidence: 99%

Simulation Studies on Centrifugal MQL-CCA Method of Applying Coolant during Internal Cylindrical Grinding Process

2020

Self Cite

View full text Add to dashboard Cite

This paper describes simulation studies regarding the application of the centrifugal minimum quantity lubrication (MQL) method simultaneously with the delivery of a compressed cooled air (CCA) stream in the internal cylindrical grinding process. The idea of a new hybrid cooling and lubrication method connecting centrifugal (through a grinding wheel) lubrication by MQL with a CCA stream is described. The methodology of computational fluid dynamics (CFD) simulation studies, as well as the results of numerical simulations, are presented in detail. The aim of the simulations was to determine the most favourable geometrical and kinematic parameters of the system in the context of air-oil aerosol and CCA flow, as well as heat exchange. In the simulation, the variables were the grinding arbor geometrical parameters, the angle of CCA supply line outlets, and the grinding wheel and workpiece peripheral speed. As a result of the simulation studies, the most favourable geometrical parameters were designated, determining the orientation of the ends of the two CCA supply line outlets before and after the grinding zone, the number of openings in the drilled-out grinding arbor, and the influence of the grinding speed on the parameters of the coolant flow and temperature of objects in the grinding zone. In addition, the results of simulation tests made it possible to visualise the velocity vectors of the two-phase coolant flow in a complex system of air-oil aerosol delivery centrifugally through an open structure of a very fast rotating porous layer (grinding wheel), with an additional supply of CCA using an external cold air gun (CAG).

show abstract

Section: Mathematical Modelmentioning

confidence: 99%

Simulation Studies on Centrifugal MQL-CCA Method of Applying Coolant during Internal Cylindrical Grinding Process

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…The rheological properties of hot trub will be used in computer simulations dealing with sedimentation in a clarifying tank. Early simulations dealt only with the flow of the wort in the presence of air, ignoring particles [ 55 , 66 , 67 ]. Later, the two-phase model was expanded with the third phase of the hot trub [ 68 ].…”

Section: Resultsmentioning

confidence: 99%

Rheological Properties of Industrial Hot Trub

Stachnik¹,

Sterczyńska²,

Smarzewska³

et al. 2021

Materials

Self Cite

View full text Add to dashboard Cite

The boiling of beer wort with hops results in the formation of a hot trub, a sediment consisting mainly of water-insoluble tannin and protein conglomerates and hop residue. Hot trub is a waste product, removed in a clarifying tank and discarded. The use of barley malt substitutes in recipes for beer is associated with an increase in the amount of generated hot trub. In presented study, an analysis of the rheological properties of industrial hot trub was carried out. Samples varied with regard to the quantities of unmalted barley (0%, 35%, and 45%) and worts’ extract (12.5, 14.1, 16.1, and 18.2 °Plato) in the recipe. The rheology of each type of sludge was determined using a hysteresis loop at four different temperatures. The results showed the shear-thinning and thixotropic properties of the hot trub. It was found that, regardless of the raw material and extract used, all samples exhibited the same rheological properties, but with different values. It was also proved that both raw material composition and temperature affected the hot trub’s rheology. The highest values of viscosity were identified for malted barley, whereas the lowest apparent viscosity values were recorded for the hot trub with a 30% addition of unmalted barley. The Herschel–Bulkley model had the best fit to the experimental data.

show abstract

“…Low near-wall velocities induced an inward secondary flow colloquially referred to as the "tea leaf effect". 19 The induced secondary flow increases the path length for bubbles local to those streamlines, potentially improving separation efficiency. Although vertical circulation may play a role in improved separation initially, at steady state (160 s), the gas-rich region provides stability to the flow, reducing internal recirculation and providing a more uniform residence time for gas disengagement.…”

Section: ■ Description Of Flow Characteristicsmentioning

confidence: 99%

Internal Gas–Liquid Separation in Industrial Ebullated Bed Hydroprocessors

Lane

Macchi

McKnight

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Ebullated bed reactors used in heavy oil upgrading internally recycle up to 90% of net liquid flow to maintain fluidized conditions. Internal phase separators result in significant gas re-entrainment within the recycled liquid, leading to high gas holdup (40 to 60%), reduced processing capacity, and over-cracking of vapor products. Phase separation in two commercial designs is assessed using computational fluid dynamics and compared to pilot-scale results. Liquid short-circuiting within first-generation recycle pan designs was identified as a key factor, leading to a reduced separation efficiency of 1 to 2 mm bubbles compared to second-generation flow-through designs. Negligible performance improvements were observed for <1 mm bubbles, highlighting the need to exercise caution when scaling these designs to hydroprocessing conditions where submillimeter bubble sizes are predominant. A practical correlation for gas separation efficiency based on the liquid residence time is proposed and compared to numerical and experimental data.

show abstract

Simulation and experimental research on the flow inside a whirlpool separator

Cited by 23 publications

References 6 publications

Simulation Studies on Centrifugal MQL-CCA Method of Applying Coolant during Internal Cylindrical Grinding Process

Simulation Studies on Centrifugal MQL-CCA Method of Applying Coolant during Internal Cylindrical Grinding Process

Rheological Properties of Industrial Hot Trub

Internal Gas–Liquid Separation in Industrial Ebullated Bed Hydroprocessors

Contact Info

Product

Resources

About