Flow field and particle attachment in a straight pipe with a symmetric cavity

This paper investigated numerically the fluid flow field over a symmetric c avity in a straight pipe, as well as the frequency distribution of particle deposition on the pipe wall. The cavity flow was much weaker than that in the bulk stream, and exhibited one or several circulation zones. When consi dering no particle detachment, the existence of a cavity has little effect on the attached particle number distribution. However, if particle detachme nt is taken into account, the cavity could collect much more particles than the remaining wall regime did, which would lead to a negative impact on dr inking water quality.