室內空間氣懸浮微粒沉積效應之研究

A Study of Deposition of Aerosols onto Surfaces in the Indoor Space

陳浚國(Junior-Kuo Chen)

指導教授 ： 蔡瑞益

中原大學/工學院/機械工程研究所/碩士(2001年)

https://doi.org/10.6840/cycu200100307

摘要

本文目的在探討氣懸浮微粒在室內中的沈積效應，藉由計算流體力學數值模擬分析與文獻上的結果做相互的驗證以確立數值模擬的可信度，且誤差值均在可接受範圍內，更進一步應用操作室內環境之互動關係。
由於影響室內空氣流動形態的因素相當複雜，舉凡固體邊界形狀、粗糙度、區隔、流體溫度及壓力、進出口位置與風速都會影響流場的分布，因此也就會改變濃度場的變化，文中針對不同粒徑及風速的條件下，分析其沉積速率。
首先以計算流體力學套裝軟體PHOENICS以 Eulerian 模式模擬氣懸浮微粒受重力沉降影響之封閉空間氣流流場，以驗證文獻上的數值資料，再將驗證所得之extra-source 項，應用在所設定的室內空間環境，比較其氣懸浮微粒的沈積率，進而計算其附著速率。

關鍵字

紊流 ； 重力沈降 ； 沈積量 ； 濃度 ； 微粒

並列摘要

The purposes of the essay are to explore the accumulation effects of the airborne particles onto surfaces in the indoor space. By comparing the CFD (computing fluid dynamic) methods and literature results can we built up the credibility of numerical analysis. The differences of the value of CFD and the literature results will lie in the acceptable regions, and they can be used to modify the interactions of indoor environments.
There are so many factors can influence the flow form of indoor air. They include solid boundary, wall coarse, block, temperature, pressure, inlet, outlet and velocity of fluid etc., which can lead to the change of particle concentration distributions. Different particle sizes and inlet air velocities are employed to simulate and calculate particle deposition rates.
First of all, CFD packed software（PHOENICS） with Eulerian model is used to simulate the gravitational settling effect of aerosols particles in an closure flow field to do a comparison with literature data. Then, we applied the code with an extra-source term to study the particle concentration and deposition rates in an indoor environment.

並列關鍵字

particle ； turbulence ； gravitational settling ； deposition ； concentration

參考文獻

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【46】趙中興，“計算流體力學模擬軟體應用在室內空氣流動、空氣品質、溫度調節與有毒氣體擴散等分析上的發展與前景（下）” ，中國冷凍空調雜誌，p95-p105，1993年6月。

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