The deposition of particles in a chamber with an attached-wall heat source is investigated numerically by the random walk model of Lagrangian method. The particle trajectories are evaluated by tracking 4,000 particles with a density of 1,400 kg m−3. The purpose of the present paper is to study the effect of the heat source length on the deposition of particles (2.5 µm–10 µm) and the particle deposition pattern on the attached-wall surface above the heat source. Numerical results show that the particle deposition fraction increases with the heat source length and the increase of the heat source length can accelerate particle deposition onto the attached wall. It is also found that the particle deposition number on the attached-wall surface above the heat source is a function of the deposit position and the particle size.
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