Analytical Model of Droplet Motion in Rotating Packed Bed

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F26%3A0198130" target="_blank" >RIV/00216305:26210/26:0198130 - isvavai.cz</a>

Výsledek na webu

<a href="https://ilass.org/papers2025.php" target="_blank" >https://ilass.org/papers2025.php</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Analytical Model of Droplet Motion in Rotating Packed Bed

Popis výsledku v původním jazyce

A rotating packed bed is a device used to intensify processes such as absorption or distillation. In this device, liquid is sprayed onto the inner surface of a rotating porous annulus. The liquid flows through the packed bed due to cen-trifugal force, forming a large interfacial area. Once the liquid reaches the packing’s outer surface, ligaments emerge from pores and break up into droplets. These droplets then move freely through the outer cavity with their motion influenced mainly by the surrounding gas flow and its drag force. All these droplets contribute to mass transfer in the cavity zone, therefore, their hydrodynamic characteristics, such as residence time, trajectory length and impact velocity, need to be studied. In this work, an analytical hydrodynamic model based on Newton’s second law and kinematic equations is developed and validated using phase Doppler velocimetry measurements. As droplets slow down due to drag force, the smallest droplets (<100 μm) lose their momentum quickly causing them to follow the gas flow and impinge on the casing with tangential velocity suggesting a low probability of splashing. These droplets have longer trajectories and residence times. Contrary, large droplets (>100 μm) retain their momentum longer and impact the casing with higher radial velocity which may indicate splashing conditions. Their trajectories and resi-dence times are short.

Název v anglickém jazyce

Analytical Model of Droplet Motion in Rotating Packed Bed

Popis výsledku anglicky

A rotating packed bed is a device used to intensify processes such as absorption or distillation. In this device, liquid is sprayed onto the inner surface of a rotating porous annulus. The liquid flows through the packed bed due to cen-trifugal force, forming a large interfacial area. Once the liquid reaches the packing’s outer surface, ligaments emerge from pores and break up into droplets. These droplets then move freely through the outer cavity with their motion influenced mainly by the surrounding gas flow and its drag force. All these droplets contribute to mass transfer in the cavity zone, therefore, their hydrodynamic characteristics, such as residence time, trajectory length and impact velocity, need to be studied. In this work, an analytical hydrodynamic model based on Newton’s second law and kinematic equations is developed and validated using phase Doppler velocimetry measurements. As droplets slow down due to drag force, the smallest droplets (<100 μm) lose their momentum quickly causing them to follow the gas flow and impinge on the casing with tangential velocity suggesting a low probability of splashing. These droplets have longer trajectories and residence times. Contrary, large droplets (>100 μm) retain their momentum longer and impact the casing with higher radial velocity which may indicate splashing conditions. Their trajectories and resi-dence times are short.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GF25-14506L" target="_blank" >GF25-14506L: Základní analýza absorpce CO2 z bioplynu v rotačním absorbéru</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů