vena contracta

简明释义

射留缩

英英释义

例句

1.In engineering, understanding the vena contracta is crucial for designing efficient flow systems.

在工程学中，理解vena contracta对设计高效的流动系统至关重要。

2.The vena contracta is often used in calculating the discharge coefficient of nozzles.

在计算喷嘴的排放系数时，通常使用vena contracta。

3.During the fluid dynamics lecture, the professor explained the concept of vena contracta as the point where a fluid stream contracts after passing through an orifice.

在流体动力学讲座中，教授解释了vena contracta的概念，即流体流经孔口后收缩的点。

4.The design of the pipe system must account for the effects of vena contracta on pressure loss.

管道系统的设计必须考虑vena contracta对压力损失的影响。

5.When measuring flow rates, it is important to consider the location of the vena contracta to ensure accuracy.

在测量流量时，考虑vena contracta的位置以确保准确性是很重要的。

作文

In the study of fluid dynamics, the term vena contracta refers to the point in a fluid stream where the cross-sectional area is at its minimum after passing through a constriction. This concept is crucial for understanding how fluids behave when they encounter obstacles or narrow passages. The vena contracta is not just a theoretical construct; it has practical implications in various engineering and medical applications. When fluid flows through a pipe that narrows, the velocity of the fluid increases as it approaches the constriction, leading to a decrease in pressure according to Bernoulli's principle. At the point of vena contracta, the fluid reaches its highest velocity and lowest pressure before it begins to expand again. This phenomenon can be observed in everyday life, such as when water flows from a garden hose with a nozzle. As the water passes through the nozzle, it accelerates, creating a vena contracta where the water stream is narrowest. Understanding this behavior is essential for designing efficient systems in plumbing, irrigation, and even in industrial processes where fluid transport is involved. In medicine, the concept of vena contracta is particularly relevant in the context of blood flow and vascular health. For instance, in echocardiography, the vena contracta can be used to assess the severity of valvular heart diseases. By measuring the width of the vena contracta, physicians can determine how much blood is leaking backward through a valve, which is crucial for diagnosing conditions like mitral regurgitation. The importance of the vena contracta extends beyond just fluid mechanics or medical diagnostics; it also plays a role in environmental science. In the study of river hydraulics, understanding the vena contracta can help predict how pollutants disperse in water bodies. When a river narrows, the flow rate increases, affecting the distribution of contaminants and influencing ecological health. Moreover, engineers utilize the principles of vena contracta when designing nozzles, orifices, and other flow control devices. They must consider the dimensions and shapes of these components to optimize performance and ensure that the desired flow characteristics are achieved. A well-designed system takes advantage of the vena contracta effect to enhance efficiency and reduce energy costs. In conclusion, the term vena contracta encapsulates a fundamental principle of fluid dynamics that has far-reaching implications across various fields. From engineering to medicine and environmental science, understanding the vena contracta is essential for innovating and improving systems that rely on fluid flow. Whether we are designing a new irrigation system, diagnosing a heart condition, or studying river ecosystems, the concept of vena contracta serves as a reminder of the intricate relationships between structure, flow, and function in our world.

在流体动力学的研究中，术语vena contracta指的是流体流经收缩处后，在流体流动中横截面积最小的点。这个概念对于理解流体在遇到障碍物或狭窄通道时的行为至关重要。vena contracta不仅仅是一个理论构造；它在各种工程和医学应用中具有实际意义。当流体通过一个变窄的管道流动时，根据伯努利原理，流体在接近收缩处时速度会增加，导致压力下降。在vena contracta点，流体达到其最高速度和最低压力，然后开始再次扩展。这种现象可以在日常生活中观察到，例如当水从带喷嘴的花园水管中流出时。当水流过喷嘴时，它加速，形成一个最窄的水流vena contracta。理解这种行为对于设计高效的管道、灌溉系统，甚至涉及流体输送的工业过程至关重要。在医学中，vena contracta的概念在血流和血管健康的背景下尤其相关。例如，在超声心动图中，vena contracta可用于评估瓣膜性心脏病的严重程度。通过测量vena contracta的宽度，医生可以确定有多少血液通过瓣膜向后泄漏，这对于诊断如二尖瓣反流等病症至关重要。vena contracta的重要性不仅限于流体力学或医学诊断；它在环境科学中也起着作用。在河流水力学研究中，理解vena contracta可以帮助预测污染物在水体中的扩散。当河流变窄时，流速增加，影响污染物的分布并影响生态健康。此外，工程师在设计喷嘴、孔口和其他流量控制装置时利用vena contracta的原理。他们必须考虑这些组件的尺寸和形状，以优化性能并确保达到所需的流动特性。一个设计良好的系统利用vena contracta效应来提高效率并降低能源成本。总之，术语vena contracta概括了流体动力学的一个基本原理，该原理在各个领域具有深远的影响。从工程到医学再到环境科学，理解vena contracta对于创新和改善依赖流体流动的系统至关重要。无论我们是在设计新的灌溉系统、诊断心脏病，还是研究河流生态系统，vena contracta的概念都提醒我们在我们世界中结构、流动和功能之间的复杂关系。