Abstract
The motion of microparticles in a vertical flow channel driven by drag and thermophoretic forces was simulated using the direct numerical simulation method with the particles tracked using the Lagrangian method. The particle motions were analyzed for five sizes of particles ( dp =1 , 2.5, 10, 20, and 100 μm ) at three temperature differences ( Δt=0 , 130 , and 180°C ). The results showed that the effect of thermophoresis on the deposition near the wall decreases with increasing particle diameter and can be neglected for particles with dp =100 μm . Since the deposition rates of inhalable particles ( PM10 ) increase dramatically as the thermophoresis force increases, especially for particles with dp =1 μm , thermophoresis is an effective method for collecting inhalable particles.
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