viscosity index

简明释义

粘度指数

英英释义

例句

1.A higher viscosity index 粘度指数 indicates that the oil will maintain its viscosity better when heated.

较高的粘度指数表明油在加热时能更好地保持其粘度。

2.When selecting motor oil, it's important to consider the viscosity index 粘度指数 for optimal engine performance.

在选择机油时，考虑粘度指数对发动机性能至关重要。

3.Lubricants with a low viscosity index 粘度指数 may not be suitable for variable temperature environments.

低粘度指数的润滑剂可能不适合变温环境。

4.Manufacturers often specify the required viscosity index 粘度指数 for their machinery.

制造商通常会指定其机械所需的粘度指数。

5.The oil with a high viscosity index 粘度指数 performs better in extreme temperatures.

具有高粘度指数的油在极端温度下表现更佳。

作文

The concept of viscosity index is essential in the field of lubrication and fluid mechanics. It measures how much a fluid's viscosity changes with temperature. Viscosity itself refers to a fluid's resistance to flow; for instance, honey has a higher viscosity than water. When we talk about the viscosity index of a lubricant, we are essentially discussing its ability to maintain a consistent viscosity across a range of temperatures. This property is crucial for ensuring that machinery operates smoothly under varying thermal conditions.In practical terms, a high viscosity index indicates that the lubricant will have less change in viscosity with temperature fluctuations. For example, if a lubricant has a high viscosity index, it means that even when the temperature rises or falls, the lubricant remains effective in providing the necessary lubrication to prevent wear and tear on engine parts. Conversely, a low viscosity index signifies that the lubricant's viscosity will change significantly with temperature changes, which could lead to inadequate lubrication at high temperatures or excessive drag at low temperatures.Understanding the viscosity index is particularly important in industries such as automotive and aerospace, where engines and machinery are subjected to extreme operational conditions. Manufacturers often specify lubricants with a high viscosity index for use in high-performance engines, as these lubricants can better withstand the rigors of temperature variations without losing their protective qualities.Moreover, the viscosity index is not just a number; it reflects the formulation of the lubricant. Additives are often included to enhance the viscosity index, allowing the lubricant to perform better over a broader range of temperatures. This is particularly vital in environments where temperature can fluctuate dramatically, such as in regions with extreme weather conditions.In conclusion, the viscosity index is a critical parameter in evaluating the performance of lubricants. It helps engineers and technicians select the appropriate lubricant for specific applications, ensuring that machinery runs efficiently and effectively. By understanding the viscosity index, one can appreciate the intricate balance between fluid dynamics and mechanical engineering, ultimately leading to improved performance and longevity of equipment.This knowledge is not only valuable for professionals in the field but also for anyone interested in how everyday products, like motor oils and greases, are formulated to meet the demands of modern technology. The viscosity index serves as a reminder of the importance of choosing the right fluids for the right applications, ensuring optimal performance and reliability in various mechanical systems.

‘粘度指数’的概念在润滑和流体力学领域至关重要。它衡量了流体的粘度随温度变化的程度。粘度本身是指流体流动的阻力；例如，蜂蜜的粘度高于水。当我们谈论润滑剂的‘粘度指数’时，我们实际上是在讨论它在不同温度范围内保持一致粘度的能力。这一特性对于确保机器在不同热条件下平稳运行至关重要。在实际应用中，高‘粘度指数’表明润滑剂在温度波动时粘度变化较小。例如，如果一种润滑剂具有高‘粘度指数’，这意味着即使温度升高或降低，润滑剂仍能有效提供必要的润滑，防止发动机部件磨损。相反，低‘粘度指数’则表示润滑剂的粘度会随着温度变化显著变化，这可能导致在高温下润滑不足或在低温下过度阻力。理解‘粘度指数’在汽车和航空等行业尤为重要，因为发动机和机械设备经受极端操作条件。制造商通常会为高性能发动机指定具有高‘粘度指数’的润滑剂，因为这些润滑剂可以更好地承受温度变化的压力，而不会失去其保护性能。此外，‘粘度指数’不仅仅是一个数字；它反映了润滑剂的配方。通常会添加助剂以增强‘粘度指数’，使润滑剂在更广泛的温度范围内表现更佳。这在温度变化剧烈的环境中尤为重要，例如在极端天气条件下的地区。总之，‘粘度指数’是评估润滑剂性能的关键参数。它帮助工程师和技术人员选择适合特定应用的润滑剂，确保机械高效、有效地运行。通过理解‘粘度指数’，人们可以欣赏流体动力学与机械工程之间的微妙平衡，最终提高设备的性能和使用寿命。这一知识不仅对该领域的专业人士有价值，也对任何对日常产品（如机油和润滑脂）如何配制以满足现代技术需求的人士具有参考意义。‘粘度指数’提醒人们选择适合应用的正确流体，以确保各种机械系统的最佳性能和可靠性。