Experimental Study of Particle Deposition Distribution on the Vertical Wall Behind Near-Wall Heat Sources

The rapid and massive deposition of particles on the vertical wall behind near-wall heat sources is a common and important phenomenon. However, the distribution pattern of such particle deposition has not been clarified. To evaluate the effect of the near-wall heat source on the particle deposition distribution on the vertical wall, an experimental study focused on 0.3 mu m, 0.5 mu m, 1.0 mu m, and 3.0 mu m particles under 12 cases with varying temperatures and rotation angles of near-wall heat sources was conducted. The results reveal that particle deposition at the vertical center axis of the rear wall initially exhibits a substantial increase, followed by a subsequent reduction as the distance from the upper surface of the heat source is enhanced. Additionally, in regions that are symmetrically positioned relative to the near-wall heat source, arranged horizontally, the particle deposition pattern of particles of identical size displays a remarkable degree of similarity. The effect of the near-wall heat source rotation angle on particle deposition on the rear wall is also intertwined with factors such as particle size and the position within the rear wall region. The concentration and deposition distribution of particles under twelve cases were presented experimentally.The experimental method was used to analyze the concentrations and decay rate loss coefficient of particles in a chamber with different heat-source parameters.The effect of several factors on particle deposition was presented.