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管道氣液兩相流阻力損失

2014-08-30 15:12 作者:管理員14 來源:未知 瀏覽: 字號:

摘要:1、氣液兩相流體流動類型 1)分散流 在水平或垂直管道中,氣相流速大于50m/s時,大部分液相呈液滴狀被氣相帶走。 2)環狀流在水平或垂直管路中,氣相沿管道中心流動,液相呈膜狀沿管壁流動,部分液相呈霧狀被氣相帶走。 3)氣泡流在水平或垂直管路中,氣相流速

1、氣液兩相流體流動類型
       1)分散流  在水平或垂直管道中,氣相流速大于50m/s時,大部分液相呈液滴狀被氣相帶走。
       2)環狀流在水平或垂直管路中,氣相沿管道中心流動,液相呈膜狀沿管壁流動,部分液相呈霧狀被氣相帶走。
       3)氣泡流在水平或垂直管路中,氣相流速為0.3一3m/s,液相流速為1.5 -4.5m/s時,泡狀氣相與液相同速流動。
       4)層流在水平管路中,液相沿管底部流動,其流速小于0. 2m/s時,氣相在光滑的氣液界面上流動,但不產生波動,其流速為1一3m/s;
       5)波狀流  與層流相似,不同之處在于氣液界面上產生波動,氣相流速約為4.5m/s,液相流速小于0.3m/s,
       6)柱狀流在水平或垂直管路中,氣相快速流動且周期地形成泡沫栓。’由于氣相比液相流速大得多,因而會撞擊彎頭等管件產生振動。
       7)活塞流在水平管路中,氣相和液相沿管子部呈活塞狀作交替運動,氣相流速<0.9m/s,液相流速<0.6m/s.

2、氣液兩相流體流動類型確定
公式及注解
公式、氣液兩相流動區域圖
3、氣液兩相流阻力損失計算
公式
公式1
分散流區域水平及垂直流修正系數
計算公式
計算公式
波狀流區域摩擦因數公式

(責任編輯:laugh521521)
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