射流激扰不同积尘量下沉积颗粒的再悬浮  

Resuspension of Deposited Particles Induced by Jets at Different Surface Dust Loads

作　　者：梅雄[1] 张腾飞[1] 王树刚[1] 

机构地区：[1]大连理工大学建设工程学部

出　　处：《建筑热能通风空调》2016年第7期33-36,83,共5页Building Energy & Environment

基　　金：国家自然科学基金(No:51278077)

摘　　要：室内表面沉积颗粒的积尘量在多个数量级之间变化。在较高的积尘量时,颗粒极有可能以多层累积的形式沉积并且相互之间可能聚集形成更大粒径的颗粒。本文实验研究了超细亚利桑那测试粉尘,在不同积尘量条件下受到剧烈的射流冲击后发生的再悬浮过程。研究结果显示,在较低积尘量下(本研究中小于3 g/m2),沉积颗粒比在较高的积尘量下受射流冲击更难再悬浮;当射流激扰较高积尘量下的沉积颗粒时,颗粒再悬浮后发生二次沉积的现象也更明显。Surface dust load on indoor surfaces can range over several orders of magnitude. At a high surface dust load, particles have more chances of depositing in multiple layer structures and agglomerating together. We experimentally examined particle resuspension of the Arizona Test Dusts （ATDs） at different surface dust loads after an intensive pulsed-jet impingement. The results reveal that the deposited particles with a low surface dust load （less than 3 g/m^2 in the tested cases） are more difficult to resuspend than those with a high surface dust load. The re-deposition of resuspended dusts soon after a jet impingement is evident at a high surface dust load.

关 键 词：室内沉积颗粒 再悬浮 射流冲击 积尘量 实验测量 

分 类 号：X51[环境科学与工程—环境工程]