Computational fluid dynamics is used to compute the pressure distribution within the urinary system to determine the bladder pressure. This will help to diagnose the symptom of BOO. It is found that the pressure loss in the unobstructed case is due to the presence of friction.
本文的研究方法，著重在找出尿道流场中影响压力损失的最主要因素，我们先建立起尿道的计算网格，利用计算流体力学算出尿道内的流场，压力分布，在配以实验验证我们的数值结果，最后利用这些结果找出一个无因次参数图来诊断膀胱出口阻塞症状。
The shaft seal can not only be safety and reliability in running process, but also meet the technical requirements of pressure and pressure-keeping time required in the reaction process, as well as avoid the invasion and leakage of poisonous gas. The stuffing seal or mechanical seal should be used for the common atmospheric pressure or low pressure. With the development of the chemical industry of petroleum, many more flammable, explosive and poisonous media appear, so the requirement of sealing is strict, and the mechanical seal thus is popularized. Compared with stuffing seal, it has many advantages: 1. Less leakage, 2. Less loss of friction power, 3. Long service life, moreover, the maintenance and adjustment is unnecessary under the normal working condition and with good shock-resistance. However
反应设备轴封不仅考虑设备运行过程达到安全可靠，同时满足反应过程工艺要求规定的压力和保压时间，同时避免有毒气体侵入和泄露，一般常压和低压选用填料密封或机械密封，由于石油化学工业的发展，易燃易爆有毒介质较多，对密封性能要求较严，应推广机械密封，它较填料密封有很多优点：1，泄露量极少，摩擦功率损失相当少。3，使用寿命长，在正常工作条件下，不需要维护调整，耐震性好，可是机械密封缺点是结构较复杂，成本较高，装拆不便，但机械密封优点占主要位置，目前广泛受到应用。
The results show that the friction coefficients of these friction couples decrease as the sliding speed increases when pressures are unaltered, and reach stable value eventually. With the increase of test pressure when speed is unaltered, the friction coefficients decrease gradually. The friction coefficients also increase with the increases of nickel content of these hard-materials. The wear loss increases as the hardness decreases. The wear mechanism is connected with the alloying component and test pressure when sliding speed is 0.95 m/s, the WC-5Ni/SiC couple is adhesive wear mechanism when p is 0.15 MPa, WC-7Ni/SiC and WC-9Ni/SiC couples are adhesion and abrasive wear mechanism; but when p is 0.60 MPa, there was abrasive wear mechanism for these WC-Ni/SiC couples.
结果表明：当压强一定时，随着滑动速度的增加，WC-Ni/SiC摩擦副的摩擦因数逐渐下降，并趋于平稳；当滑动速度一定时，随着试验压强 p 的增加，摩擦因数逐渐减小；摩擦因数还随合金中Ni含量的增加而增大；硬质合金的磨损量随材料的硬度降低而增大；当滑动速度0.95 m/s时，摩擦副材料的磨损机制与合金成分和试验压强 p 有关，当 p ＝0.15 MPa时，WC-5Ni/SiC为粘着磨损，WC-7Ni/SiC和WC-9Ni/SiC表现为粘着和磨粒磨损综合作用机制；当 p ＝0.60 MPa时，3种摩擦副的磨损机制主要是磨粒磨损。
In order to determine hydraulic friction coefficient of polypropylene pipe, a high pressure water column diffuse gage was used to measure the friction loss head of a long straight PPR pipe at different flow rates.
为了测定聚丙烯塑料管的水力摩阻系数λ，用高压水柱压差计实测了PP-R直管段在不同稳态流量下的沿程水头损失，同时用电磁流量计测得相应的管道流量值。
In order to calculating compressible flow, author related the variation of stage pressure and density by means of the friction loss and polytropic efficiency.
为适应可压缩流动计算的需要，利用局部摩擦损失建立了压力与密度的联系。
Friction Pressure Loss of Coiled Tubing Vibrator
连续管振动器摩擦压力损失计算与分析
With triple eccentric structure, the new utility-type energy-saving tilting disk check valves consist of two sections, the included angle of valve seat and the center line of valve body flow channel is 55 degree, with the merits of short travel and no friction when open-close operation, the more pressure, the better sealing function, during the operation of closing valve plate, the seal operation can be fulfilled without no punch and collision due to the action of damping mechanism, top it off, it has the merits of long service life, wide applicable scope, short travel, energy saving, large flow, small resistance and small pressure loss.
本实用新型节能型斜盘式止回阀采用三偏心结构，阀体两部分结构，阀座与阀体流道中心线呈55度夹角。启闭角度行程短，启闭过程无摩擦；压力越大，密封效果越好；阀板关闭时，在阻尼机构作用下实现无冲击无碰撞地实现密封，防水锤破坏作用；使用寿命长，适用范围广；启闭行程时间短，大量节省能量；流量大，流阻小，压降损失小。
The author discussed the ways of reducing the micro-irrigation system's pressure at work and the functions of antifouling based on the formulation of the friction loss of micro tube emitter head.
本文从微管滴头摩阻水头损失计算公式，分析探讨减少滴灌系统运行工作压力和抗堵塞性能的途径。
Aimed to the blood pump driven by the extra magnetic field, the pressure distributing, the load capacity of blood lubricants film, friction and the power loss resulted from friction were calculated.
结合外场驱动微型轴流式血泵计算了血泵叶轮转子轴承在血液润滑条件下润滑膜的压力分布、承载能力、摩擦力、摩擦功耗等参数。
While the test-bed running, the pressure, friction, and other aspects of energy loss change into heat, which increase the fuel temperature. High fuel temperature will result in increased leakage and oxidation, which shorten the service life of components and reduced the detection accuracy.
试验台运行时，压力、摩擦等各方面损失的能量转化为热量，使得燃油温度升高，油温过高会导致泄漏量增加，氧化加剧，元件使用寿命减少，检测精度降低。
This paper presents a quasi linear dynamic model of diesel engine, including air mass flow rate, fuel/air ratio, indicated thermal efficiency, friction loss, indicated mean effective pressure and engine dynamics etc. sub models.
本文建立了柴油机准线性动态模型，详细描述了空气流量率、燃空比、指示热效率、摩擦损失、平均指示压力输出、发动机动力学等子模型。
The result showed that the leakage loss and the friction loss were related to the pressure difference between, the size of gap, the circumference velocity, etc.
研究结果表明：压差、间隙宽度、进口圆周速度，间隙长度等因素均对容积损失与圆盘摩擦损失有影响。
The friction loss factor and the density ratio had a significant influence on the back pressure sensitivity.
摩擦损失系数和密度比对回压敏感性的影响很大。
The Compensation Effect of Friction Loss of Fluid in Differential Pressure Analyzer Elbows
含水比率管中弯管对流动摩阻损失的补偿作用
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。
It was concluded that a certain group of geometric parameters of the molded lines could make the friction loss power of the removable vortex pan least under the condition of satisfying the suction pressure, pressure ratio, and suction volume.
经过理论分析及模拟计算，得出在满足吸气压力、压力比、吸气容积的条件下，总有一组涡旋型线几何参数能使动涡盘上的摩擦损失功率最小。
MaxP in accordance with DIN EN 806-2 and DIN EN 806-3 requirements; · Output pressure ΔpP in accordance with DIN EN 806-2 requirements; Abbreviations Description Δpgeo using the pressurization system after static pressure head difference between pressure loss pmin Fl extract most disadvantageous point of minimum flow of hydraulic pressure Δp =Σ(I · R +ΔpF) after using the pressurization system and a separate post due to wall friction resistance point of the pressure loss caused by ΔpAp subsequent to the use of turbocharging system components, such as flush valves, mixers, washing shower pressure loss caused by On the table: determining the calculation of the output pressure booster system requirements for the various coefficients of.
maxP依照DIN EN 806-2 和DIN EN 806-3的规定；·输出压力ΔpP 依照DIN EN 806-2的规定；缩写描述Δpgeo 在使用增压系统后静态压头差的压力损失 pmin Fl 最不利的液压抽取点的最小流动压Δp =Σ(I · R +ΔpF)after 在使用增压系统后由于管壁摩擦和单独的阻力点造成的压力损失ΔpAp 在使用增压系统后由于配件如冲洗阀、混合器、冲洗淋浴等造成的压力损失上表中：确定计算增压系统要求输出压力的各个系数。
Casing of high-speed gas and relatively low friction between the liquid and can significantly reduce the dynamic pressure loss improve pump full of coefficient to achieve the purpose of pump efficiency improve.
通过减少套管中的高速气体与相对低速的液体之间的摩擦，能显著降低动态压力损失，提高抽油泵的充满系数，达到提高泵效的目的。