boundary layer

简明释义

边界层

英英释义

例句

1.The boundary layer plays a crucial role in determining the drag force experienced by an aircraft.

这边界层在决定飞机所受的阻力方面起着至关重要的作用。

2.In meteorology, the boundary layer is where most weather phenomena occur.

在气象学中，边界层是大多数天气现象发生的地方。

3.The thickness of the boundary layer can significantly affect heat transfer rates.

在热传递速率中，边界层的厚度可以显著影响。

4.Engineers must consider the boundary layer when designing more efficient wind turbines.

工程师在设计更高效的风力涡轮机时必须考虑边界层。

5.Researchers are studying the boundary layer to improve pollution dispersion models.

研究人员正在研究边界层以改善污染扩散模型。

作文

The concept of the boundary layer is fundamental in fluid dynamics and plays a crucial role in various engineering applications. In essence, the boundary layer refers to the thin region adjacent to a surface where the effects of viscosity are significant. This phenomenon occurs when a fluid flows over a solid boundary, such as an airplane wing or the hull of a ship. Understanding the boundary layer is essential for predicting how fluids behave in different scenarios, which can lead to more efficient designs and improved performance.When a fluid, such as air or water, encounters a solid surface, it does not flow uniformly. Instead, the velocity of the fluid decreases as it approaches the surface due to the friction between the fluid molecules and the solid. This creates a gradient of velocity, with the fluid closest to the surface moving much slower than that further away. The region where this velocity change occurs is what we call the boundary layer. The thickness of the boundary layer can vary depending on several factors, including the speed of the fluid, the viscosity of the fluid, and the nature of the surface.One of the most important aspects of the boundary layer is its impact on drag forces experienced by objects moving through a fluid. For instance, in aviation, minimizing drag is critical for improving fuel efficiency and overall performance. Engineers must consider the boundary layer when designing aircraft wings to ensure that air flows smoothly over the surface, thereby reducing turbulence and drag. If the boundary layer becomes turbulent, it can lead to increased drag and decreased lift, ultimately affecting the aircraft's performance.In addition to aviation, the concept of the boundary layer is also vital in marine engineering. Ships must be designed with an understanding of how water flows around their hulls to minimize resistance and improve speed. The boundary layer affects the way water interacts with the ship, and engineers use this knowledge to create streamlined designs that enhance performance.The boundary layer also has implications beyond engineering. In environmental science, understanding the boundary layer is crucial for studying air pollution dispersion. Pollutants released into the atmosphere interact with the boundary layer, and their concentration can vary significantly within this region. By studying the dynamics of the boundary layer, scientists can better predict how pollutants will spread and affect air quality.In conclusion, the boundary layer is a critical concept in fluid dynamics that has far-reaching implications in various fields, from engineering to environmental science. By understanding the behavior of the boundary layer, engineers and scientists can make informed decisions that lead to improved designs and better environmental management. The study of the boundary layer continues to evolve, providing new insights that can help us tackle challenges in fluid mechanics and beyond.

边界层的概念在流体动力学中是基础性的，并在各种工程应用中发挥着至关重要的作用。简单来说，边界层指的是靠近表面的薄区域，在该区域内粘性效应显著。当流体流过固体边界时，例如飞机机翼或船体，就会发生这种现象。理解边界层对于预测流体在不同场景中的行为至关重要，这可以导致更高效的设计和改善的性能。当流体（例如空气或水）遇到固体表面时，它并不会均匀流动。相反，由于流体分子与固体之间的摩擦，流体在接近表面时速度会减小。这造成了速度的梯度，离表面最近的流体移动得比远离表面的流体慢得多。发生这种速度变化的区域就是我们所称的边界层。边界层的厚度会根据多个因素变化，包括流体的速度、流体的粘度和表面的性质。边界层最重要的方面之一是它对物体在流体中所受阻力的影响。例如，在航空领域，最小化阻力对于提高燃油效率和整体性能至关重要。工程师在设计飞机机翼时必须考虑边界层，以确保空气能够平稳地流过表面，从而减少湍流和阻力。如果边界层变得湍流化，可能会导致阻力增加和升力减少，最终影响飞机的性能。除了航空，边界层的概念在海洋工程中也至关重要。船只必须在了解水流如何绕过其船体流动的情况下进行设计，以最小化阻力并提高速度。边界层影响水与船只的相互作用，工程师利用这些知识来创建流线型设计，从而增强性能。边界层在环境科学中也有重要的意义。理解边界层对于研究空气污染扩散至关重要。释放到大气中的污染物与边界层相互作用，其浓度在该区域内可能会显著变化。通过研究边界层的动态，科学家可以更好地预测污染物将如何传播并影响空气质量。总之，边界层是流体动力学中的一个关键概念，在各个领域都有深远的影响，从工程到环境科学。通过理解边界层的行为，工程师和科学家可以做出明智的决策，从而提高设计和改善环境管理。对边界层的研究持续发展，提供了新的见解，可以帮助我们应对流体力学及其他领域的挑战。