9 research outputs found
Sound parameters on acoustics agglomeration.
<p>Effect of frequency, intensity and residence time on agglomeration efficiency. (Reproduced from Liu et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0178851#pone.0178851.ref096" target="_blank">96</a>] for fly ash with bi-modal characteristics).</p
Filtration efficiency of MERV 8 and 13 filters.
<p>Relationship between filter efficiency and particle size [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0178851#pone.0178851.ref033" target="_blank">33</a>], including the size distributions of virus [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0178851#pone.0178851.ref152" target="_blank">152</a>], bacteria [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0178851#pone.0178851.ref153" target="_blank">153</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0178851#pone.0178851.ref154" target="_blank">154</a>] and fungi [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0178851#pone.0178851.ref151" target="_blank">151</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0178851#pone.0178851.ref155" target="_blank">155</a>].</p
Summary of relevant experimental works in acoustic agglomeration with reported performances.
<p>Summary of relevant experimental works in acoustic agglomeration with reported performances.</p
Experimental results on the effect of acoustic agglomeration on particle size concentration.
<p>In the smaller size range, number concentration of particles in the range of 0.4 μm to 0.5 μm in diameter is reduced by almost 16%. In the intermediate size range of around 1 μm to 2.5 μm, we observe another drop in number concentration of 10%.</p
Orthokinetic and hydrodynamic mechanisms.
<p>Due to differential fluid and inertia forces, particles become entrained at different amplitudes and phase in the oscillations of an acoustic field. Consequently, the relative motions between the different sized particles result in collisions.</p
Forces acting on fine particles (PM<sub>2.5</sub>) in an acoustics field.
<p>Forces acting on fine particles (PM<sub>2.5</sub>) in an acoustics field.</p
Experimental results on the filtration efficiencies of MERV 11 and 13 filters with and without acoustic agglomeration pre-conditioning.
<p>Filtration efficiency is expressed as the percentage drop in particle number concentration before the agglomeration zone and after the filter. With acoustic pre-conditioning, the filtration efficiency of the MERV 11 filter is increased by about 10%, bringing its filtration efficiency closer to that of the MERV 13 filter without acoustic pre-conditioning.</p
Schematic of experimental set-up.
<p>Experimental set-up simulating travelling airborne PM in an open-loop, draw-through wind tunnel (resembling a ventilation duct) with acoustic agglomeration pre-conditioning prior to a test filter that is typically used in ACMV systems.</p
Filter properties [157] and computed fan power to overcome filter pressure drop in Eq (2), assuming an overall fan efficiency of 0.15.
<p>Filter properties [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0178851#pone.0178851.ref157" target="_blank">157</a>] and computed fan power to overcome filter pressure drop in Eq (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0178851#pone.0178851.e002" target="_blank">2</a>), assuming an overall fan efficiency of 0.15.</p