Mixed Flow Stabilized by Tube Filling

Mixed Flow Stabilized by Tube Filling

謝忠霖(Chung-Lin Hsieh)

指導教授 ： 潘瑋

國立中正大學/理學院/物理學系/碩士(2014年)

摘要

由Introduction to Fluid Mechanics可得知封閉管內流體的流量與管面積、壓力有關。然而不同管徑之管流匯流之後的混合比例，會因為匯流之後的總開口面積改變。流的水流量比例會隨著匯流後出水口大小的改變而有所變化。我們於實驗中找出兩水管匯流其混合比例與開口大小的關係，並驗證兩管匯流並非是兩單一管管流的線性疊加。
　　實驗中觀察得知：匯流後水流是否能夠填充滿水管會是影響總水流量的一個關鍵，所以我們為了縮小出水口處的有效面積，在匯流處加了芯。而從實驗結果得知加了芯確實能夠提升出水口總流量，並且可以使兩管的混和比例更穩定，不隨開口改變而有明顯的變化。

關鍵字

加芯管 ； 同軸管 ； 填滿 ； 管流 ； 穩定管流

並列摘要

As it was indicated in Introduction to Fluid Mechanics, flow capacity in stabilized pipe is related to the area of the tube and dynamic pressures. However , flow capacity ratio changes if outlet valve size is changed. We want to fine the relation between flow capacity ratio and flow valve size. In experiment we try to prove that, mixed pipe flow is not just the super position of two single pipe flow.

In experiment we find that whether the tube was filled or not has a great influence on flow capacity. In order to reduce the size of the outlet valve, a plastic pen was placed in the tube as a core. With the core, the flow capacity ratio between two tubes of the mixed pipe flow is truely more stable.

並列關鍵字

tube with core ； coaxial pipe ； tube filling ； pipe flow ； filling pipe

參考文獻

[5] ASHRAE Handbook－Fundamentals. Atlanta, GA: American Society of Heating, Refrigerating, and Air Conditioning Engineer, Inc., 1981.

[1] Robert W.Fox．Alan T.McDonald,”Introduction to Fluid Mechanics” 4th ed. (NACA),Technical RePory 1174, 1954.

[2] Hinze, J.O., Turblence, 2nd ed. New York: McGraw-Hill,1975

[3] Moody, L.F.,”Friction Factors for Pipe Flow,”Transactions of the ASME, 66, 8, Novemver 1944, pp. 671-684]

[4] ”Flow of Fluid through Vales, Fitting, and Pipe,”New York: Crane Company, Technical Paper No. 410, 1982.