film coefficient of heat transfer

简明释义

薄膜导热系数

英英释义

例句

1.A higher film coefficient of heat transfer indicates better thermal performance in HVAC systems.

较高的热传递膜系数表明HVAC系统的热性能更好。

2.In our study, we measured the film coefficient of heat transfer to optimize the cooling system.

在我们的研究中，我们测量了热传递膜系数以优化冷却系统。

3.Engineers often refer to the film coefficient of heat transfer when designing radiators.

工程师在设计散热器时常常参考热传递膜系数。

4.The film coefficient of heat transfer can vary based on the fluid properties and flow conditions.

根据流体特性和流动条件，热传递膜系数可能会有所不同。

5.The film coefficient of heat transfer is crucial for determining the efficiency of heat exchangers.

热交换器的效率与热传递膜系数密切相关。

作文

The concept of film coefficient of heat transfer is a critical parameter in the field of heat transfer engineering. It represents the efficiency with which heat is transferred between a solid surface and a fluid in motion over that surface. Understanding this coefficient is essential for engineers and designers who aim to optimize thermal systems in various applications, from industrial processes to HVAC systems. The film coefficient of heat transfer can vary significantly depending on factors such as the type of fluid, the velocity of flow, and the temperature difference between the solid surface and the fluid. In practical terms, the film coefficient of heat transfer can be influenced by the physical properties of the fluid, including its viscosity, density, and thermal conductivity. For instance, in cases where a fluid flows over a heated surface, the layer of fluid closest to the surface experiences a reduction in velocity due to the friction between the fluid and the solid. This layer is known as the thermal boundary layer, and it plays a crucial role in heat transfer efficiency. The thickness of this layer can affect the overall film coefficient of heat transfer, making it an important consideration in thermal design.Moreover, the film coefficient of heat transfer is often categorized into two types: convective and radiative heat transfer. Convective heat transfer occurs when a fluid is in motion, and it can be further classified into forced and natural convection. Forced convection involves external forces, such as pumps or fans, to enhance fluid movement, whereas natural convection relies on buoyancy forces resulting from temperature differences within the fluid. On the other hand, radiative heat transfer occurs through electromagnetic waves and does not require a medium.Calculating the film coefficient of heat transfer can be complex, as it often requires empirical correlations derived from experimental data. Engineers typically use dimensionless numbers, such as the Reynolds number and the Nusselt number, to estimate the film coefficient of heat transfer. The Reynolds number characterizes the flow regime, while the Nusselt number relates to the convective heat transfer relative to conductive heat transfer. By understanding these relationships, engineers can better predict heat transfer rates and design more efficient thermal systems.In conclusion, the film coefficient of heat transfer is an essential concept in the study of heat transfer. Its significance extends across various engineering disciplines, impacting everything from energy efficiency to material selection in thermal applications. As industries continue to evolve and seek more sustainable solutions, a thorough comprehension of the film coefficient of heat transfer will remain vital in driving innovation and improving system performance. By mastering this concept, engineers can contribute to the development of more effective and efficient thermal management strategies that meet the demands of modern technology and environmental sustainability.

热传递中的膜热传递系数概念是热传递工程领域中的一个关键参数。它代表了热量在固体表面与流动在该表面上的流体之间转移的效率。理解这个系数对于旨在优化各种应用中热系统的工程师和设计师至关重要，从工业过程到暖通空调系统。膜热传递系数可能会因流体类型、流动速度和固体表面与流体之间的温差等因素而显著变化。在实际应用中，膜热传递系数会受到流体物理特性的影响，包括其粘度、密度和导热性。例如，在流体流过加热表面的情况下，最靠近表面的流体层由于流体与固体之间的摩擦而经历速度的降低。这个层被称为热边界层，它在热传递效率中扮演着至关重要的角色。这个层的厚度可以影响整体的膜热传递系数，使其成为热设计中的一个重要考虑因素。此外，膜热传递系数通常分为两种类型：对流和辐射热传递。对流热传递发生在流体运动时，可以进一步分为强迫对流和自然对流。强迫对流涉及外部力量，如泵或风扇，以增强流体运动，而自然对流依赖于流体内部的温差所引起的浮力。在另一方面，辐射热传递则通过电磁波发生，不需要介质。计算膜热传递系数可能很复杂，因为它通常需要从实验数据得出的经验关系。工程师通常使用无量纲数，如雷诺数和努塞尔数，来估计膜热传递系数。雷诺数表征流动状态，而努塞尔数则与相对于导热的对流热传递相关。通过理解这些关系，工程师可以更好地预测热传递速率，并设计出更高效的热系统。总之，膜热传递系数是热传递研究中的一个基本概念。它的重要性跨越多个工程学科，对从能源效率到热应用中的材料选择都有影响。随着工业的不断发展，寻求更可持续的解决方案，深入理解膜热传递系数将继续在推动创新和提高系统性能方面发挥重要作用。通过掌握这一概念，工程师可以为开发更有效和高效的热管理策略做出贡献，以满足现代技术和环境可持续性的需求。