Simplifying analysis of sorption of SVOCs to particles: Lumped parameter method and application condition

Simplifying analysis of sorption of SVOCs to particles: Lumped parameter method and application condition
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SVOC 对颗粒吸附的简化分析:集总参数方法和应用条件

DOI:
10.1016/j.ijheatmasstransfer.2016.03.100
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发表时间:
2016-08
影响因子:
5.2
通讯作者:
Zhang Yinping
Zhang Yinping
中科院分区:
工程技术2区
文献类型:
--
作者:
Liu Cong;Cao Jianping;Zhang Yinping

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半挥发性有机化合物 (SVOC) 和颗粒之间的动态质量传递需要准确而简单的描述才能进行暴露评估。集总参数法(LPM)就是这样一种简化的方法。 LPM应用于传质的经典条件是,当无因次过量浓度限制在5%以下时,小数(Lt=vtL/D/K,内阻与外阻的无因次比)小于0.1。应该注意的是,上述条件证明了从时间 = 0 到 ∞ 期间应用 LPM 是合理的。然而,在室内环境中,空气中颗粒的寿命往往是有限的,例如大约一小时。 LPM 在如此有限期限内的应用条件尚未明确。通过无量纲分析,我们得出了临界小数 (Ltc) 与 Fom 之间的相关性(Fom=Dt/r2,持续时间的无量纲参数)。这表明有限期限LPM的应用条件不太严格。例如,如果Fom< 10−4,Ltcis 小于 5.2。为了说明简化方法的应用和相应结果的准确性,给出了一个分析实际住宅建筑中 SVOC 和空气颗粒之间瞬态传质过程的例子。该方法还可用于解决有限时间内的各种瞬态传质问题。
Dynamic mass transfer between semi-volatile organic compounds (SVOCs) and particles needs accurate and simple description for exposure assessment. The lumped parameter method (LPM) is such a simplified approach. The classical condition under which LPM applies in mass transfer is that the Little number (Lt=vtL/D/K, dimensionless ratio of internal resistance to external one) is less than 0.1 when dimensionless excessive concentration is constrained to be less than 5%. It should be noted that the condition above justifies application of LPM from time = 0 to∞. However, in indoor environments, lifetime of airborne particles tends to be finite, e.g., on the order of one hour. The application condition of LPM for such finite duration has not been clarified. Using dimensionless analysis, we derived a correlation to relates the critical Little number (Ltc) withFom(Fom=Dt/r2, a dimensionless parameter for duration time). It shows that the applied condition of LPM for finite duration is less strict. For example, ifFom< 10−4,Ltcis smaller than 5.2. To illustrate application of the simplified approach and corresponding accuracy of the results, an example is presented for analyzing the transient mass transfer processes between SVOCs and airborne particles in practical residential buildings. The approach is also useful to address various transient mass transfer problems within finite time.
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