Study Of The Characteristics Of Particulate Deposition On The Surface Of Fin-and-tube Heat Exchanger

Finned tube exchanger is one of the important equipment of air-conditioning system.It can not only affect the efficiency of the finned tube exchanger but affect the indoor airquality indirectly, when the particulate matters deposit on the face of the finned tubeexchanger. The research of the depositional law of the particulate matters will providereliable theory basis for reducing the deposition of the particle, and has a realisticsignificance to the structure modification and cleaning work of finned tube heatexchanger. This paper studied the depositional law of the particulate matters byadopting the method of simulation and experiment, and offered some relevantsuggestions for reducing the deposition of the particle based on the reality.The deposition of particles of different size on the flat surface of finned tube type heatexchanger is simulated, and analyzed the trajectory of these particles between the finsand the amount of deposition. When the velocity of the wind is in a low range1-3m/s,the particles which size between1-10μm have better following properties， and thetracks are curves. the particles which size are greater than50μm, as the wind speedincreases, the inertia force plays a main role, the tracks present linear, the depositionweight also increases.Different wind velocity and spaces between fins affect the deposition of theparticles greatly. In the velocity range of1-6m/s, the deposition of the particles whichsizes are10μm is reducing with the wind velocity increasing; in the velocity range of1-3m/s, the deposition of the particles which sizes are50μm is reducing with the windvelocity increasing, but when the velocity is between4-6m/s, the deposition increasingwith the velocity increasing. Through the simulation, the larger the spaces between fins, the greater the amount of deposit of the particles which sizes are larger than20μm，butsmaller the amount of deposit of the particles which sizes are smaller than10μm.This paper verifies the simulated results about the regularity of Particle depositionthrough the experiment, proves the feasibility and accuracy of simulation. And put someforward suggestions about the controlling of particulate deposition.