reynolds number

简明释义

雷诺数

英英释义

例句

1.The reynolds number 雷诺数 can be calculated using the fluid's velocity, density, and viscosity.

可以使用流体的速度、密度和粘度计算雷诺数 reynolds number。

2.In fluid dynamics, the reynolds number 雷诺数 helps predict flow patterns in different fluid flow situations.

在流体动力学中，雷诺数 reynolds number 有助于预测不同流体流动情况下的流动模式。

3.When designing pipelines, understanding the reynolds number 雷诺数 is crucial for avoiding excessive pressure drops.

在设计管道时，理解雷诺数 reynolds number 对于避免过大的压力损失至关重要。

4.A low reynolds number 雷诺数 indicates laminar flow, while a high value indicates turbulent flow.

低雷诺数 reynolds number 表示层流，而高值则表示湍流。

5.Engineers often measure the reynolds number 雷诺数 to ensure optimal performance in hydraulic systems.

工程师们通常测量雷诺数 reynolds number 以确保液压系统的最佳性能。

作文

The concept of Reynolds number is fundamental in fluid mechanics, providing insights into the behavior of fluid flow. Named after the British engineer Osborne Reynolds, this dimensionless quantity helps predict flow patterns in different fluid flow situations. The Reynolds number is defined as the ratio of inertial forces to viscous forces and is calculated using the formula: Reynolds number = (density × velocity × characteristic length) / dynamic viscosity.Understanding the Reynolds number is crucial for engineers and scientists who work with fluid systems. For instance, in the design of pipelines, the Reynolds number can indicate whether the flow will be laminar or turbulent. Laminar flow, which occurs at low Reynolds numbers, is smooth and orderly, while turbulent flow, which occurs at high Reynolds numbers, is chaotic and irregular.In practical applications, a Reynolds number less than 2000 typically indicates laminar flow, whereas a Reynolds number greater than 4000 suggests turbulent flow. Between these two values lies a transitional flow regime where the flow can fluctuate between laminar and turbulent states. This understanding is essential for various engineering applications, including the design of aircraft wings, the optimization of chemical reactors, and the analysis of environmental flows in rivers and oceans.For example, in aerodynamics, the Reynolds number plays a critical role in determining how air flows over an aircraft wing. At low speeds, the flow may remain laminar, allowing for smoother flight characteristics. However, as speed increases and the Reynolds number rises, the flow can transition to a turbulent state, which can affect lift and drag forces acting on the wing. Engineers must consider these effects when designing wings to ensure optimal performance across a range of flight conditions.Moreover, in the field of biomedical engineering, the Reynolds number is significant when studying blood flow in arteries. The human circulatory system operates under conditions that can vary widely in terms of speed and viscosity, making it essential to understand how the Reynolds number influences blood flow characteristics. For instance, in narrow vessels, blood flow can become laminar, which is critical for efficient nutrient and oxygen transport. Conversely, in larger vessels or during periods of increased physical activity, the flow may become turbulent, potentially leading to complications such as thrombosis.In conclusion, the Reynolds number is a vital parameter in fluid dynamics that helps predict flow behavior. Its applications span across various fields, from aerospace engineering to biomedical research. By comprehensively understanding the implications of the Reynolds number, engineers and scientists can design more efficient systems and improve our understanding of natural phenomena. As we continue to explore the complexities of fluid flow, the Reynolds number will undoubtedly remain a key component in our analyses and designs.

雷诺数的概念在流体力学中是基础性的，提供了对流体流动行为的洞察。以英国工程师奥斯本·雷诺兹的名字命名，这个无量纲量帮助预测不同流体流动情况下的流动模式。雷诺数被定义为惯性力与粘性力的比率，其计算公式为：雷诺数 = （密度 × 速度 × 特征长度）/ 动态粘度。理解雷诺数对从事流体系统工作的工程师和科学家至关重要。例如，在管道设计中，雷诺数可以指示流动是层流还是湍流。层流发生在低雷诺数下，流动平稳有序，而湍流发生在高雷诺数下，流动混乱不规则。在实际应用中，雷诺数小于2000通常表示层流，而雷诺数大于4000则表明湍流。在这两个值之间存在一个过渡流动状态，流动可能会在层流和湍流状态之间波动。这种理解对于各种工程应用至关重要，包括飞机机翼的设计、化学反应器的优化以及对河流和海洋中环境流动的分析。例如，在空气动力学中，雷诺数在确定空气如何流过飞机机翼时发挥着关键作用。在低速下，流动可能保持层流，从而允许更平滑的飞行特性。然而，随着速度的增加和雷诺数的升高，流动可能会过渡到湍流状态，这会影响作用于机翼的升力和阻力。因此，工程师在设计机翼时必须考虑这些影响，以确保在各种飞行条件下的最佳性能。此外，在生物医学工程领域，雷诺数在研究动脉中的血液流动时也具有重要意义。人体循环系统的运行条件在速度和粘度方面可能变化很大，因此了解雷诺数如何影响血流特性至关重要。例如，在狭窄的血管中，血流可能变为层流，这对有效的营养和氧气运输至关重要。相反，在较大的血管中或在剧烈运动期间，流动可能变为湍流，可能导致诸如血栓形成等并发症。总之，雷诺数是流体动力学中一个重要的参数，有助于预测流动行为。它的应用跨越多个领域，从航空航天工程到生物医学研究。通过全面理解雷诺数的影响，工程师和科学家可以设计出更高效的系统，并提高我们对自然现象的理解。随着我们继续探索流体流动的复杂性，雷诺数无疑将继续在我们的分析和设计中占据关键地位。