WIND TUNNEL MEASUREMENTS OF THE DISPERSION OF TWO IDENTICAL SIDE-BY-SIDE DENSE GAS PLUMES IN THE TURBULENT BOUNDARY LAYER

Industry activities such as steel production or fossil power station have generated a huge amount of CO_2 dense gas. The CO_2 dense gas had been captured and transported through pipeline to store in tanks. Accidents of continuous release of dense gas form the pipeline or storage tank will make a harmful and strong impact on the atmospheric environment. The dispersion of such hazardous gas constitutes a severe human health threat for inhabitants adjacent to the industries and storage areas. In the present study, wind tunnel experiments were performed to determine the dispersion characteristics of CO_2 dense gas continuously spilling from two identical sources with side-by-side in a turbulent boundary layer. Effects of different gaps between two sources and various source discharge strengths on the heavy gas plumes dispersion were conducted in the experiments. Experimental results reveal that two dense plumes do not merge at the near field as the gap of two sources is greater than 30 times of discharged source diameter for the cases of different discharging strength with the densimetric Froude number 20, 22, and 26. The maximum value of vertical concentration profile at each of the downstream station increases with increasing the densimetric Froude number of discharge. The dispersion length scale of merged dense plume increases along with the downstream distance.

關鍵字

dense gas plume ； densimetric Froude number ； dispersion length scale ； turbulent boundary layer flow ； two sources in side-by-side

並列摘要

本文使用風洞實驗量測研究左右相鄰兩重質氣體羽昇流在紊流邊界層內擴散特性。重質氣體採用二氧化碳，實驗量測探討分析相鄰兩排放源之間距以及排放源密度福祿數對於重質氣體羽昇流濃度擴散特性。實驗結果顯示當兩排放源之間距超過30倍排放源口徑時，兩重質氣體羽昇流在近域處不會交會混合。若排放源密度福祿數增加時，沿排放源下游各垂直剖面之最大濃度值隨之增加。交會混合羽昇流之擴散尺度係沿排放源下游距離而增大。

並列關鍵字

重質氣體；密度福祿數；擴散尺度；紊流邊界層流；左右相鄰兩排放源

國際替代計量

WIND TUNNEL MEASUREMENTS OF THE DISPERSION OF TWO IDENTICAL SIDE-BY-SIDE DENSE GAS PLUMES IN THE TURBULENT BOUNDARY LAYER

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