nusselt number

简明释义

努塞尔特数

英英释义

例句

1.In this experiment, we observed that increasing the temperature significantly affected the Nusselt number 努塞尔数.

在这个实验中，我们观察到提高温度显著影响了Nusselt number 努塞尔数。

2.Engineers often refer to the Nusselt number 努塞尔数 when designing heat exchangers.

工程师在设计热交换器时常常参考Nusselt number 努塞尔数。

3.The relationship between velocity and the Nusselt number 努塞尔数 can be analyzed using computational fluid dynamics.

速度与Nusselt number 努塞尔数之间的关系可以通过计算流体动力学进行分析。

4.To improve efficiency, we need to optimize the Nusselt number 努塞尔数 in our cooling system.

为了提高效率，我们需要优化冷却系统中的Nusselt number 努塞尔数。

5.The calculation of the Nusselt number 努塞尔数 is essential for determining heat transfer in fluid flow.

计算Nusselt number 努塞尔数 对于确定流体流动中的热传递至关重要。

作文

The concept of the Nusselt number is fundamental in the field of heat transfer. It provides a dimensionless quantity that describes the ratio of convective to conductive heat transfer across a boundary. Understanding the Nusselt number is crucial for engineers and scientists who work with thermal systems, as it helps in predicting how well a fluid can transfer heat under various conditions.In essence, the Nusselt number is used to characterize the efficiency of heat exchangers, thermal insulation, and other systems where heat transfer plays a crucial role. The formula for calculating the Nusselt number is given by:N = hL/kWhere 'h' represents the convective heat transfer coefficient, 'L' is the characteristic length, and 'k' is the thermal conductivity of the fluid. A higher Nusselt number indicates that convection is more effective compared to conduction, meaning that the fluid is good at transferring heat.Different flow conditions can lead to different Nusselt number values. For instance, in laminar flow over a flat plate, the Nusselt number can be calculated using specific empirical correlations. Conversely, in turbulent flow, the situation becomes more complex, and various models are used to estimate the Nusselt number. This variability underscores the importance of understanding the flow regime when analyzing heat transfer processes.One of the applications of the Nusselt number is in the design of heat exchangers, which are critical components in many industrial processes. By optimizing the Nusselt number, engineers can enhance the performance of these devices, leading to improved energy efficiency and reduced operational costs. Additionally, the Nusselt number is instrumental in computational fluid dynamics (CFD) simulations, allowing for accurate predictions of temperature distributions and heat transfer rates in complex systems.Moreover, the Nusselt number is not limited to just engineering applications; it also finds relevance in environmental science. For example, in studying natural convection in lakes or oceans, the Nusselt number can help predict how heat is distributed in water bodies, influencing ecosystems and climate patterns.In conclusion, the Nusselt number is a vital parameter in heat transfer analysis. Its ability to quantify the relative contributions of convection and conduction makes it an indispensable tool for engineers and scientists alike. By mastering the Nusselt number, professionals can design more efficient thermal systems, leading to advancements in technology and improvements in energy conservation. Thus, a deep understanding of the Nusselt number not only enhances our grasp of thermodynamic principles but also contributes to practical solutions in various fields, from engineering to environmental science.

努塞尔数（Nusselt number）的概念在热传递领域中是基础性的。它提供了一个无量纲的量，描述了边界上对流与导热之间的比率。理解Nusselt number对于从事热系统工作的工程师和科学家至关重要，因为它有助于预测流体在各种条件下的热传递能力。本质上，Nusselt number用于表征热交换器、热绝缘和其他热传递起重要作用的系统的效率。计算Nusselt number的公式为：N = hL/k其中'h'代表对流热传递系数，'L'是特征长度，'k'是流体的导热性。较高的Nusselt number表示对流相较于导热更为有效，这意味着流体在传递热量方面表现良好。不同的流动条件会导致不同的Nusselt number值。例如，在平板上的层流中，可以使用特定的经验关联来计算Nusselt number。相反，在湍流中，情况变得更加复杂，需要使用各种模型来估算Nusselt number。这种变化强调了在分析热传递过程时理解流动状态的重要性。Nusselt number的一个应用是在热交换器的设计中，热交换器是许多工业过程中的关键组件。通过优化Nusselt number，工程师可以提高这些设备的性能，从而改善能源效率并降低运营成本。此外，Nusselt number在计算流体动力学（CFD）模拟中也是至关重要的，允许准确预测复杂系统中的温度分布和热传递速率。此外，Nusselt number不仅限于工程应用；它在环境科学中也具有相关性。例如，在研究湖泊或海洋中的自然对流时，Nusselt number可以帮助预测热量在水体中的分布，从而影响生态系统和气候模式。总之，Nusselt number是热传递分析中的一个重要参数。它能够量化对流和导热的相对贡献，使其成为工程师和科学家不可或缺的工具。通过掌握Nusselt number，专业人士可以设计出更高效的热系统，从而推动技术进步和提高能源节约。因此，深入理解Nusselt number不仅增强了我们对热力学原理的掌握，还为工程到环境科学等各个领域的实际解决方案做出了贡献。