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Filtration00:53

Filtration

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Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Three-Compartment Open Model01:06

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The three-compartment open model is a pharmacokinetic model used to describe the distribution and elimination of drugs following extravascular administration. It comprises a central compartment representing the plasma and two peripheral compartments. The highly perfused peripheral compartment represents organs and tissues with a rich blood supply, such as the liver, kidneys, and lungs. The scarcely perfused peripheral compartment represents tissues with lower blood supply, such as adipose...
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The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
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Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
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Properties of Packed Bed Structures Formed during Filtration: A Two and Three-Dimensional Model.

William Eales1,2, Chris J Price1,2, William Hicks3

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Pharmaceutical processing faces agglomeration challenges. Modeling filtration beds reveals how particle packing during filtration impacts drying and agglomeration, enabling process design improvements.

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Area of Science:

  • Pharmaceutical Engineering
  • Materials Science
  • Chemical Engineering

Background:

  • Agglomeration during pharmaceutical secondary processing increases costs and requires additional resources.
  • Particle contacts during filtration can lead to robust agglomerates during drying.
  • Understanding filtration bed packing is crucial for addressing agglomeration.

Purpose of the Study:

  • To simulate packed bed formation during filtration using computational models.
  • To analyze the impact of particle size distribution on packing and void formation.
  • To provide insights into filtration, drying, and agglomeration processes.

Main Methods:

  • Developed two and three-dimensional computational models.
  • Simulated filtration using circular and spherical particles with bimodal size distributions.
  • Analyzed packing statistics, void formation, interparticle contacts, and percolation structures.

Main Results:

  • Characterized packing and void formation in simulated filtration beds.
  • Investigated the influence of particle size distribution on bed structure.
  • Quantified interparticle contacts and percolation pathways relevant to agglomeration.

Conclusions:

  • The developed model aids in understanding the origins of agglomeration during filtration and drying.
  • Predictive capabilities can guide rational process design to minimize agglomeration.
  • This research offers a foundation for optimizing pharmaceutical manufacturing processes.