Abstract
Small modular reactor (SMR) adopts heat pipe as the heat exchanger, which can improve its inherent safety. In the process of heat exchange, the deposition of fine particles caused by fluid flowing through the surface of heat pipe will cause heat transfer deterioration and the corrosion of pipe wall, which will adversely affect the safe operation of the reactor. The law of fine particle deposition on the outer wall of the simplified heat pipe model was numerically simulated, and the particle deposition in the fluid field outside the pipe was obtained under different temperature difference and flow velocity. The results showed that in the process of axial flow along the pipe wall, the velocity near the wall decreases gradually along the radial direction, and decreases to a fairly small value at the pipe wall; due to the heating effect of the heat pipe, the temperature of the fluid near the wall increases gradually along the axis, and there is a heat affected zone in the fluid temperature on the cross section. With the increase of working fluid flow rate and inlet temperature, the particle deposition rate increased first and then decreased.
