Attenuated Periodical Oscillation Characteristics in a Nanoscale Particle-Laden Laminar Flow

Abstract

Transport properties in nanoparticles-laden flow are of great importance for their practical use, such as in tubular reactor-based photocatalytic technologies. In our study, an experimental setup based on photocatalytic application was employed to investigate the nanoparticle transport characteristics in the flow reactor. An interesting periodical attenuated oscillation of the particle volume fraction and mean particle size with time was found in the nanoparticle-laden flow. We further analyzed the period of the attenuated oscillation curve by conducting a linear fitting, which shows that the period can be express as ( , )the period is proportional to the length of test section and inversely proportional to the flowrate.We found the time 5T is a very important criterion for whether the particle suspension has reached the quasi-steady state and the nanoparticle has been well suspended. Our work is believed to be valuable efficient and effective transportation of nanoparticle in laminar flow with low energy consumption.

Whole Contact Line Pinning for Droplets Impacting on a Hydrophobic Surface Due to Hydrophilic TiO2 Nanoparticle Addition

“…The particles deposited on the surface are observed to be arranged regularly, and the average size of the TiO 2 particles is 13.2 ± 5.1 μm. As previously reported, the TiO 2 nanoparticles usually aggregate to larger microscale particles in the water-based suspension. , It is thus reasonable for us to consider the role of inertia of micron-sized particles in the droplet spreading process.…”

“…As previously reported, the TiO 2 nanoparticles usually aggregate to larger microscale particles in the water-based suspension. 34,35 It is thus reasonable for us to consider the role of inertia of micron-sized particles in the droplet spreading process.…”

Periodical oscillation of particle-laden laminar flow within a tubular photocatalytic hydrogen production reactor predicted by discrete element method

“…In our previous work, we had established an experimental set-up as has been shown in Fig 1 [47]. It has six parts: main flow channel, centrifugal pump, wet sample injector, laser particle analyzer and connecting tube.…”

“…Since the particle aggregation phenomenon has noticeable impact on many applications, there have been many theoretical [59][60][61] and experimental [62][63][64] studies focus on the problem. In this study, aggregation was also taken into account by introducing a real particle size distribution (PSD) which had been obtained from experimental data [47]. In other words, the particles aggregation was assumed to be equilibrium state and the particles in this study are aggregated secondary particles, thus the aggregation effect is taken into consideration in reality.…”

“…Fig 2 a) Particles size distribution of the P25-TiO2 powder dispersed in water, b) Variation ofvarious mean particle sizes and particle volume fraction with time [47]. …”