TY - JOUR
T1 - Transient stratification force on particles crossing a density interface
AU - Verso, Lilly
AU - Reeuwijk, Maarten van
AU - Liberzon, Alexander
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/12
Y1 - 2019/12
N2 - We perform a series of experiments to measure Lagrangian trajectories of settling and rising particles as they traverse a density interface of thickness h using an index-matched water-salt-ethanol solution. The experiments confirm the substantial deceleration that particles experience as a result of the additional force exerted on the particle due to the sudden change in density. This stratification force is calculated from the measurement data for all particle trajectories. In absence of suitable parameterisations in the literature, a simple phenomenological model is developed which relies on parameterisations of the effective wake volume and recovery time scale. The model accurately predicts the particle trajectories obtained in our experiments and those of Srdić-Mitrović et al. (1999). Furthermore, the model demonstrates that the problem depends on four key parameters, namely the entrance Reynolds number Re1, entrance Froude number Fr, particle to fluid density ratio ρp/ρf, and relative interface thickness h/a.
AB - We perform a series of experiments to measure Lagrangian trajectories of settling and rising particles as they traverse a density interface of thickness h using an index-matched water-salt-ethanol solution. The experiments confirm the substantial deceleration that particles experience as a result of the additional force exerted on the particle due to the sudden change in density. This stratification force is calculated from the measurement data for all particle trajectories. In absence of suitable parameterisations in the literature, a simple phenomenological model is developed which relies on parameterisations of the effective wake volume and recovery time scale. The model accurately predicts the particle trajectories obtained in our experiments and those of Srdić-Mitrović et al. (1999). Furthermore, the model demonstrates that the problem depends on four key parameters, namely the entrance Reynolds number Re1, entrance Froude number Fr, particle to fluid density ratio ρp/ρf, and relative interface thickness h/a.
KW - 3D-PTV
KW - Density interface
KW - Inertial particles
KW - Lagrangian trajectories
KW - Stratification force
UR - http://www.scopus.com/inward/record.url?scp=85072299430&partnerID=8YFLogxK
U2 - 10.1016/j.ijmultiphaseflow.2019.103109
DO - 10.1016/j.ijmultiphaseflow.2019.103109
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AN - SCOPUS:85072299430
SN - 0301-9322
VL - 121
JO - International Journal of Multiphase Flow
JF - International Journal of Multiphase Flow
M1 - 103109
ER -