The non-Fourier effect on the fin performance under periodic thermal conditions
The non-Fourier effect on the fin performance under periodic thermal conditions
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周期性热条件下翅片性能的非傅立叶效应
DOI：
10.1016/s0307-904x(98)10061-6
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发表时间：
1998
影响因子：
5
通讯作者：
Jae
中科院分区：
文献类型：
--
作者：
Jae
本文研究了周期性热条件下热弛豫时间（非傅里叶效应）对对流翅片热性能的影响。假设环境传热系数随空间变化。考虑基础温度的周期性振荡。一种有效的数值方案涉及拉普拉斯变换和控制体积方法的混合应用以及双曲形函数，用于求解线性双曲热传导方程。将非傅里叶热传导模型预测的翅片热性能与傅里叶模型预测的热性能进行了比较。结果表明，热弛豫时间对翅片性能的影响在初始瞬态后的短时间内是显着的。对于稳态，如果温度振荡的频率很高，非傅里叶效应仍然很大。
This paper investigates the effect of thermal relaxation time (the non-Fourier effect) on the thermal performance of a convective fin under periodic thermal conditions. The environment heat transfer coefficient is assumed to be spatially varying. The periodic oscillation of the base temperature is considered. An efficient numerical scheme involving the hybrid application of the Laplace transform and control volume methods in conjunction with hyperbolic shape functions is used to solve the linear hyperbolic heat conduction equation. The thermal performance of the fin predicted by using the non-Fourier heat conduction model is compared with that predicted by using the Fourier model. Results show that the effects of the thermal relaxation time on the fin performance are significant for a short time after the initial transient. For the steady state, the non-Fourier effect is still great if the frequency of the temperature oscillation is high.