本研究包含兩個部分，第一部分為多槽式氣罩上方連結圓管的吸氣孔位置計算分析與設計，第二部分為不同管道元件的壓力損失和流動實驗。
第一部分專注於多槽式氣罩上方連結圓管的吸氣孔位置設計，多槽式氣罩是一種有多道吸氣槽的氣罩，通常有不同的高度與長度。儘管在局部通風的領域被廣泛使用，但目前卻幾乎沒有關於如何設計多槽式氣罩之幾何外形的研究。本研究發現，若連結圓管的吸氣口置於多槽式氣罩上板，且若是吸氣孔位置和吸氣槽面距離過近，會發生吸氣槽的吸氣速度不均勻之情況。當此情況發生時，會導致有些區域的吸氣槽無法達到原先設定的捕集速度，進而產生污染物洩漏的後果。因此本研究歸納出在不同的氣罩高度、吸氣孔大小、氣罩長度下，多槽式氣罩上方的吸氣圓孔前緣和吸氣槽面之水平距離的設計方法，可使整個吸氣槽面的吸氣速度達到一定的均勻度以上。
第二部分為探討通風管道系統內，當流體通過不同管道元件時，因靜壓損失所造成的靜壓差以及管道內流場流動情形。在工廠內時常可以看到各種管道元件，例如不同轉角的歧管、彎管，不同張角的縮管、擴管，節流閥等等，本研究旨在探討：(1)不同管道元件在不同流量下，於上下游所造成的靜壓差；(2)量測靜壓時，量測位置對量測結果的影響；(3)利用雷射輔助煙霧流場可視化觀察管道內流體通過不同元件時，於管道內之流動情形，例如於不同插入角的岐管元件，流體經支管流入主管道時所造成的迴流泡差異。結果顯示：(1)若二元件之間距離過短，則無法得到正確的流量與靜壓力差之關係。(2)流場可視化可以幫了解各元件上下游流體之流動型態。

The study consisted of two parts. The design procedure of multi-slot hood used in a local ventilation system was developed using the computational method in the first part. The flow characteristics in a piping system used for local ventilation consisting varying components were studied experimentally. A traditional multi-slot hood commonly presented a problem of uneven suction velocity distributions across the suction slots. The literature survey found no available solutions. A pre-study analysis showed that the problem was induced by the non-uniform distributions of the static pressure in the plenum chamber of the multi-slot hood. To overcome the problem, the exhaust port located at the ceiling of the hood could be moved away from the suction surface consisting the slots to reduce the non-uniformility of the static pressure distributions across the suction surface. With the assistance of a commercial Computational Fluid Dynamics (CFD) code, a method of locating the exhaust port of the plenum chamber of the multi-slot hood was successfully developed. The laser-light-sheet-assisted smoke flow visualization technique was applied to a transparent piping system to understand the flow characteristics when the flow passing through varying piping components. The pressure differences across the piping components were measured by a VR-type pressure transducer. The pressure loss coefficient across the piping components were calculated using the dynamic pressure and pressure difference

[1] 黃榮芳、林楷玲、許清閔，「工業通風－原理與實務」，工礦安全衛生技師公會全國聯合會，台北，2018，ISBN：9789869651707
[2] 勞委會勞工安全衛生研究所，「作業場所空氣有害物預估與控制研究-側風對傳統型氣罩捕及效果之探討」，委員會勞工安全衛生研究所研究報告，IOSH88-H103, 1999
[3] 行政院勞工委員會，「有機溶劑中毒預防規則」，台北，台灣，2003
[4] Huang, R.F., Chen, J.L., Chen, Y.K., Chen, C.C., Yeh, W. Y., and Chen, C.W., The Capture Envelope of a Flanged Circular Hood in Cross Drafts,AIHA Journal, Vol.62, No.2, 2001, pp.199-207
[5] Huang,R.F., Liu, G.S., Chen, Y. K., Yeh, W.Y., Chen, C.W., and Chen, C. C., Effects of Flange Size on Dividing Streamline of Extertor Hoods in Cross Drafts, Journal of Occupational and Environmental Hygiene, Vol. 1, No.5, 2004, pp.283-288
[6] Klein, M. K., A Demonstration of NIOSH Push-Pull Ventilation Criteria, AIHA J., Vol. 48, No.3, 1988, 1988, pp. 238-246
[7] Flagan, R. C. and Seinfeld J. H., Fundamentals of Air Pullution Engineering, Prentice Hall, Englewood Cliffs, New Jersey, 1988, pp. 295-307