TY - JOUR

T1 - Counterflows and stagnation of meridional motion in a three-fluid vortex

AU - Tintulova, Maria

AU - Naumov, Igor

AU - Sharifullin, Bulat

AU - Shtern, Vladimir

N1 - Conference code: 40

PY - 2024/10/14

Y1 - 2024/10/14

N2 - In the course of the search for a flow pattern optimal for culture growth in vortex bioreactors, our experiments discovered striking flow structures that existing theoretical models cannot explain. Three immiscible liquids fill a vertical open cylindrical container whose sidewall is still while the bottom disk rotates driving a circulatory fluid motion. The centrifugal force pushes the lower liquid (L, aqueous glycerol) from the axis to the periphery near the bottom, creating its toroid circulation that in turn drives the middle liquid (M, sunflower oil) and the upper liquid (U, alcoholic glycerine). Under certain conditions with increasing rotation, counterflows develop near both interfaces LM and MU: the liquids move towards (away from) the axis below (above) the interface that seems paradoxical. At a small thickness of M, a stagnation zone arises where the axial and radial velocities vanish and the M liquid only rotates. As M thickness decreases, this stagnation zone expands and occupies the entire volume of the middle liquid. These counterintuitive results await their theoretical explanation and formulation of new contact conditions at the LM and MU interfaces.

AB - In the course of the search for a flow pattern optimal for culture growth in vortex bioreactors, our experiments discovered striking flow structures that existing theoretical models cannot explain. Three immiscible liquids fill a vertical open cylindrical container whose sidewall is still while the bottom disk rotates driving a circulatory fluid motion. The centrifugal force pushes the lower liquid (L, aqueous glycerol) from the axis to the periphery near the bottom, creating its toroid circulation that in turn drives the middle liquid (M, sunflower oil) and the upper liquid (U, alcoholic glycerine). Under certain conditions with increasing rotation, counterflows develop near both interfaces LM and MU: the liquids move towards (away from) the axis below (above) the interface that seems paradoxical. At a small thickness of M, a stagnation zone arises where the axial and radial velocities vanish and the M liquid only rotates. As M thickness decreases, this stagnation zone expands and occupies the entire volume of the middle liquid. These counterintuitive results await their theoretical explanation and formulation of new contact conditions at the LM and MU interfaces.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85211907421&origin=inward&txGid=32eb6c875ad0d78b3a6699a32d805594

UR - https://www.mendeley.com/catalogue/c733d4f3-5915-3179-9b9d-40360da4ce46/

U2 - 10.1051/e3sconf/202457801037

DO - 10.1051/e3sconf/202457801037

M3 - Conference article

VL - 578

JO - E3S Web of Conferences

JF - E3S Web of Conferences

SN - 2555-0403

M1 - 01037

T2 - Всероссийская конференция с международным участием «XL Сибирский теплофизический семинар», посвященная 110-летию со дня рождения академика С.С. Кутателадзе и 300-летию Российской академии наук

Y2 - 20 August 2024 through 23 August 2024

ER -