Early-Stage Evolution of Particle Size Distribution Due to Gravitational Coagulation

Jung, Chang Hoon; Park, S. H.; Lee, K. W.; Kuhlman, Michael R.

doi:10.1080/02726350008906829

Cited by 10 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, an analytical approach that could solve for the complex permittivity of an RBC considering heterogeneous distribution and biconcave shape at high volume fraction does not exist. While numerical simulations of an individual rouleau with finite difference schemes exist, they are currently not practical in modeling the experimental data 45 , 46 . As RBCs aggregate and sediment towards the bottom of the chamber, the RBC concentration in top layers decrease, and concentration increase in bottom layers.…”

Section: Resultsmentioning

confidence: 99%

“…A similar numerical approach by Zhbanov and Yang 32 could represent the time response of conductivity response even at larger time scales, it is clear that modifications in the RBC sedimentation theory were required so that reliable sedimentation parameters could be obtained. In these modeling efforts, one needs to consider the sensor geometry and a physical theory of sedimentation, such as the model in the work of Jung et al 46 , which are both outside the scope of this work. The present study approximates the sample impedance such that each layer in the measurement chamber is serially combined.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

β-Dispersion of blood during sedimentation

Sabuncu

Muldur

Çetin

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Aggregation of human red blood cells (RBC) is central to various pathological conditions from bacterial infections to cancer. When left at low shear conditions or at hemostasis, RBCs form aggregates, which resemble stacks of coins, known as ‘rouleaux’. We experimentally examined the interfacial dielectric dispersion of aggregating RBCs. Hetastarch, an RBC aggregation agent, is used to mimic conditions leading to aggregation. Hetastrach concentration is incrementally increased in blood from healthy donors to measure the sensitivity of the technique. Time lapse electrical impedance measurements were conducted as red blood cells form rouleaux and sediment in a PDMS chamber. Theoretical modeling was used for obtaining complex permittivity of an effective single red blood cell aggregate at various concentrations of hetastarch. Time response of red blood cells’ impedance was also studied to parametrize the time evolution of impedance data. Single aggregate permittivity at the onset of aggregation, evolution of interfacial dispersion parameters, and sedimentation kinetics allowed us to distinguish differential aggregation in blood.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

β-Dispersion of blood during sedimentation

Sabuncu

Muldur

Çetin

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The geometric mean volume, geometric standard deviation and total number of particles can be obtained by the following equations (Jung et al 2000):…”

Section: Gravitational Coagulationmentioning

confidence: 99%

Theoretical Estimation of Extinction Coefficient Due to Time Evolution of Particle Size Distribution

Tang

Lin

2012

Particulate Science and Technology

View full text Add to dashboard Cite

The extinction coefficient of atmospheric aerosol particles influences the earth's radiation balance directly or indirectly and it can be determined by the scattering and absorption characteristics of aerosol particles. The problem of estimating the change of extinction coefficient due to time evolution of particle size distribution is studied and an improved method for calculating the single particle extinction efficiency is proposed. Through this improved method, the single particle extinction efficiency can be expressed simply in powers of particle diameter based on the anomalous diffraction approximate for the particle size range from 0.1 to 10 mm in diameter first, and then the change of the overall extinction coefficient undergoing (individually and simultaneous) Brownian and gravitational coagulation as well as condensation can be estimated comprehensively with the moment method based on the general dynamic equation. The feasibility and reliability of this method are investigated and the effect of time evolution of particle size distribution on the extinction coefficient is also estimated systemically. Simulation experiments indicate that the extinction coefficient obtained with the improved method coincides fairly well with that using the Mie theory, which provides a simple, dependable, and efficient method to estimate the change of extinction coefficient during the particle dynamic processes.

show abstract

“…The moment method suggested by Jung et al [7] was used for numerical predictions. The boundary conditions of cylinder were used in the numerical calculation.…”

Section: Numerical Predictionsmentioning

confidence: 99%

“…Ahn and Gentry [6] calculated time-dependent particle size changes due to Brownian coagulation, gravitational coagulation and gravitational settling using a numerical scheme. Recently, Jung et al [7] investigated the evolution of the particle size distribution of an aerosol undergoing gravitational coagulation in the early time stages both numerically and analytically, and derived analytical solutions for gravitational coagulation using the moment method under the assumption of a lognormal size distribution. However, experimental studies on gravitational coagulation are scarce.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Aerosol Coagulation by Gravitation

Kwon

Lee

2002

Part. Part. Syst. Charact.

View full text Add to dashboard Cite

The behaviors of aerosols having particle diameters of 1–5 μm were studied experimentally and the results were compared with numerical calculations. For the experimental study, a specially designed coagulation cylinder was developed and the moment method was used in the numerical predictions. The experimental results were characterized by the size parameters including the geometric mean diameter (GMD), the geometric standard deviation (GSD) and the particle number concentration (N). Particle distributions in the cylinder were measured at certain time intervals. In a closed cylinder, the mechanism governing aerosol behavior appeared to be gravitational coagulation. Separately, the numerical calculations were carried out using the moment method. The experimental results and the numerical predictions were in reasonable agreement. It is believed that the present work represents the first experimental study on gravitational coagulation.

show abstract

Early-Stage Evolution of Particle Size Distribution Due to Gravitational Coagulation

Cited by 10 publications

References 8 publications

β-Dispersion of blood during sedimentation

β-Dispersion of blood during sedimentation

Theoretical Estimation of Extinction Coefficient Due to Time Evolution of Particle Size Distribution

Experimental and Numerical Study of Aerosol Coagulation by Gravitation

Contact Info

Product

Resources

About