Comparison of a computational model of single bubble Collection efficiency in a hallimond tube

The paper reports how a CFD model compares to a set of
experimental results to address single bubble collection
efficiency ( ). The particles were mono-dispersed (100-
1000 nm) spherical nanoparticle. The experiment was
performed in a Hallimond Tube (HT), one bubble at a
time was produced at the bottom and was passed through
water suspended with the nanoparticle. The main focus
of this research is to solve the nanoparticle as a
convection-diffusion model (CDM) and discrete particle
model (DPM) and compare the results with the
experimental collection efficiency. Prediction of the flow
around a solid sphere and the CDM were compared with
the pressure coefficient and theoretical collection
efficiency respectively. The diffusivity of nanoparticles
was calculated using the Einstein equation. It was
concluded that neither CDM nor DPM predicts the
collection efficiency well. This approach of transport of
nanoparticles is a fundamental approach as it deals with
the accurate solution around a rising bubble and wellestablished
Brownian diffusion model (BDM).