热声流在线性温度梯度中的热声流
Enrico Corato1, David van Assche1, Ola Jakobsson1
1Lund University, Department of Biomedical Engineering, Lund, Sweden.
Physical review. E
|September 16, 2025
概括
研究人员探索了声音和热量如何在微通道中相互作用. 这些场的结合产生了强大的热声流,大大提高了潜在的热交换器应用的流体流量.
科学领域:
- 流体动力学 流体动力学
- 声学 声学 在声学方面
- 热传递是一种热传递.
背景情况:
- 热声学效应发生在声音场中的温度梯度.
- 了解微通道中的流体行为对于各种应用至关重要.
研究的目的:
- 为了研究直角声音和热场在充满水的微通道中的相互作用.
- 量化所产生的热声流及其对自然对流和声流的增强.
- 评估声场对通道热阻的影响.
主要方法:
- 实验测量三维流体在微通道中的流动.
- 声场,热梯度和组合场的应用.
- 道的横截面的二维模拟.
- 使用和不使用声场测量流体的温度.
主要成果:
- 声和热场的组合产生了热声流,比自然对流速度快30倍,比声流速度快15倍.
- 二维模拟显示了与实验流数据的良好的定性一致.
- 声场的存在降低了流体的热阻,尽管模型并没有完全捕捉到这一点.
结论:
- 正角声和热场显著增强微通道中的流体流动.
- 热声流提供了一种强大的流体操纵和热传递增强机制.
- 这些发现表明,在使用液体介质的声学辅助热交换器中,有潜在的应用.
更多相关视频
相关概念视频
01:19Thermal Strain
2.8K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.8K
01:09Deriving the Speed of Sound in a Liquid
905
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
The speed of sound in fluids can be derived by considering a mechanical wave...
905
01:05Absorption of Radiation
1.2K
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
1.2K
01:23Steady, Laminar Flow in Circular Tubes
1.0K
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
1.0K
01:17Steady, Laminar Flow Between Parallel Plates
797
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
797
01:11Temperature and Thermal Equilibrium
9.1K
Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
9.1K