Dynamics of fine particles during impingement of jets on a body with a needle

• DOI: 10.1007/s10891-013-0910-3
• Publication Date: 2013-09-12T03:04:46Z
• Authors: A.P. Alkhimov*; I. A. Bedarev; A. V. Fedorov
• Keywords: 0203 mechanical engineering; 02 engineering and technology

Numerical simulation of the impingement of a jet of a two-phase mixture of a gas with submicron metal particles on an obstacle with a needle located in front of it is carried out. The structure of a separated flow formed on impingement of a supersonic jet on a body with a needle has been studied. A comparison of various approximations for the law of resistance of spherical particles is made. It is shown that particles whose size exceeds 5 μm practically have a rectilinear trajectory and velocity sufficient for cold gas-dynamical deposition, whereas particles of diameter less than 0.2 μm envelope the separation zone being formed near the needle, and their velocity is much smaller than the critical one.