Numerical simulation of the effect of plate spacing on heat transfer characteristics within a parallel-plate heat exchanger in a standing wave thermoacoustic system
Numerical simulation of the effect of plate spacing on heat transfer characteristics within a parallel-plate heat exchanger in a standing wave thermoacoustic system
复制标题
驻波热声系统中板间距对平行板换热器传热特性影响的数值模拟
DOI：
10.1051/e3sconf/201911600028
复制
发表时间：
2019
影响因子：
--
通讯作者：
Huang H
中科院分区：
文献类型：
--
作者：
Huang H
利用热声技术可以在热能和机械（声）能之间高效地转换能量。因此，热声装置的传热特性对于理解热声装置的机理和提高热声装置的效率，特别是在热交换器中具有重要意义。本文介绍了一个二维计算流体力学模型，并研究了板间距对平行板换热器传热特性的影响。开源CFD软件OpenFOAM因其高度可定制的功能而被应用，以改变控制参数。首先给出了计算模型，包括几何模型、边界条件、方程组、离散格式、湍流模型和热物性模型，然后采用网格无关性验证方法对网格质量进行了验证。模拟结果表明，板间距对换热器板间及相邻区域的换热有影响，换热系数随板间距的减小而增大。分析还表明，Re数在247.2和321.4之间可能发生向湍流的流动转变。本文的研究结果有助于对热声系统内部传热过程的理解，并为今后的研究奠定了基础。
Power can be converted with high efficiently between thermal energy and mechanical (acoustic) energy by using thermoacoustic technologies. Thus, the heat transfer characteristics are significant to the understanding of mechanisms, and improvement of efficiency for thermoacoustic devices, notably in heat exchangers. This paper introduces a two-dimensional computational fluid dynamics model of flow across a parallel-plate heat exchanger and investigates the effect of plate spacing on heat transfer characteristics. The open source CFD software OpenFOAM is applied because of the highly customizable capabilities to vary the control parameters. Firstly, the computational model including geometry, boundary conditions, equations, discretization scheme, turbulence and thermophysical properties’ models are presented, and then grid-independence validation is presented to verify the quality of mesh. The simulation results show that plate spacing influences the heat transfer between plates and adjacent area of heat exchanger, and the heat transfer coefficient goes up when the plate spacing decreases. The analysis also indicates that a possible flow transition to turbulence occurred within Re number between 247.2 and 321.4. The results in this work can help the understanding of heat transfer inside thermoacoustic system, and form a basis for future research.
影响因子：
2.4
作者：
Lei Shi;Xiaoan Mao;A. Jaworski
通讯作者：
Lei Shi;Xiaoan Mao;A. Jaworski
平行板堆末端的振荡流：现象学和相似性分析
影响因子：
1.5
作者：
Mao X
通讯作者：
Mao X