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

Abstract

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).

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