The formation of fly ash deposition on heat transfer tubes in a boiler taken as the research background

an experiment of fly ash particle impacting plate at ambient temperature and pressure was carried out to investigate the effects of initial velocity and fly ash particle diameter on normal coefficient of restitution.The experimental results show that when particle diameter remained constant

normal coefficient of restitution en first increased

then leveled

and finally decreased as normal incident velocity vi

n increased

and in the rapid increase region of en

the slope of the experimental curve(en vs vi

n)was very large.This was due to the variation of the ratios of different types of energy to the total energy in the different ranges of normal impact velocity.When normal incident velocity remained constant

normal coefficient of restitution increased as particle diameter increased.The critical capture velocity changed with microsphere diameter

the larger the size

the smaller the capture velocity.