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- The key factors affecting frictional pressure loss in narrow annuli are changing annular dimensions, rotation and vibration of drill strings. 影响窄环空中摩擦压降的关键因素为环空尺寸的变化、钻柱的旋转和振动。
- A Novel Model of Calculating Circulating Frictional Pressure Loss in Narrow Annuli 计算窄间隙环空循环压耗的新模型
- Keywords frictional pressure loss calculations;narrow annuli;rheological property;drilling; 压耗计算;窄间隙;数学模型;流变性;钻井;
- frictional pressure loss 摩擦压力损失
- friction pressure loss 摩擦压力损失
- It can not require a pressure loss. 它不会造成压力损失。
- Friction losses in the equivalent lengths of ducts constitute the pressure loss in the elbow. 管道的等量长度中的摩擦损失即构成弯管中的压力损失。
- The test method of pressure loss,flow loss and frictional force loss etc.of the hydraulic pumping units is presented,from which the mechanical efficiency and volumetric efficiency are obtained. 给出了测取液压抽油机系统压力损失、流量损失以及油缸的摩擦力损失等的方法,并由此求出系统的机械效率与容积效率。
- Propeller meters introduce small pressure losses. 螺旋浆式流量计的压力损失
- The frictional pressure drop can be calculated by Chisholm equation, and the constant C in the equation depended on the quality. 可以用奇母霍斯关系式来计算窄环隙内的两相摩擦压降,式中的常数可由含气率计算
- Type 0- Full round port opening offering minimum pressure loss conditions. 类型0-全圆形端口开启度,压降损失最小。
- The tradeoff comes in how much permanent pressure loss can be tolerated. 平衡点在于究竟容许多少长期压力损耗。
- In the experiment, with the increase of water cut, the frictional pressure drops decrease sharply when water disperses in oil but hardly change when oil disperses in water. 本实验范围内，当管内液相处于油包水时，摩擦压降随含水率的增大急剧减小，当液相处于水包油时，随着含水率的增大，流动摩擦压降随含水率的增大变化平缓。
- An experimental study of frictional pressure drop characteristics of R410A-oil mixture flow boiling inside straight and C-shape horizontal enhanced tubes was performed. 实验研究了环保制冷工质R410A-润滑油混合物在直强化管和C形强化管内流动沸腾的摩擦压降特性。
- For upward churn flow, it is found that the relationship between frictional pressure drop and venturi pressure drop can be calculated by Martinelli parameter X. 在块状流条件下，推导了利用马丁内里参数计算垂直上升管摩擦压降与文丘利管节流压降间关系的公式，进而实现了截面含气率的测量。
- The results show that the A-t curve wave separator has a higher separation efficiency with a petty pressure loss. 结果表明,本文提出的A-t双参数曲线波形板分离叶片不仅分离效率高,而且流动损失小。
- The truss structure featured by small flow resistance,strong toughness and less pressure loss. 具有流阻小，刚性好，压力损失小的桁架式结构。
- To calculate discharge port pressure,this article considers the influence on frictional pressure drop in the gas and liquid two-phase flow between rod and tubing owing to rotation of rods. 在计算排出口压力计算过程中,考虑了由于抽油杆柱旋转引起杆管环空气液两相流摩阻的影响。
- EP-W203/H DRA is a ultra-high molecular polymer, which can reduce the pressure loss of pipe flow. 型减阻剂是一种超高分子聚合物,注入管道后可以降低管流的压力损失。
- Effects of superficial gas/liquid velocities and water volume fraction on the frictional pressure drop of three-phase flow in vertical downward pipe (40 mm i. d. ) are experimentally investigated. 对垂直下降钢管内油气水三相流动的摩擦压降受折算液速、折算气速和油水混合物中含水率的影响进行了试验研究。
