翅形扰流片作用下的微通道换热特性

doi:10.11949/0438-1157.20240332

摘要/Abstract

摘要：

基于有限体积（FVM）离散方法和动网格技术，模拟三维矩形微通道内的翅形扰流片的主动扰流换热情况。模拟条件为层流Reynolds数50~250，扰流片的运动频率（f）10~50 Hz。结果表明，不同运动频率下的Nusselt数、摩阻系数（fr）及综合评价因子（PEC）均在一定范围内呈现类正弦变化，其周期与扰流片运动周期相同。在Re=50、f=10~50工况下，扰流片作用下的微通道PEC为0.75~1.52，并随频率的增加而上升。特别是在低频范围内，PEC表现出一定的单调性。通过引入翅形扰流片，微通道的传热效率得到了显著的提高，相较于光滑矩形微通道（PEC=1），在Re=50、f=10 Hz工况下PEC提高了5%，在Re=50、f=50 Hz的条件下PEC提高了30%。

关键词: 动网格, 换热特性, 热力学, 翅形扰流片, 微通道, 数值模拟

Abstract:

This study employs the finite volume method (FVM) and dynamic mesh technology to simulate the active disturbance heat transfer of fin-shaped vortex generators in a three-dimensional rectangular microchannel. The simulation conditions are laminar Reynolds numbers (Re) ranging from 50 to 250, and vortex generator oscillation frequencies (f) from 10 to 50 Hz. The results indicate that the Nusselt number (Nu), friction coefficient (fr), and performance evaluation criterion (PEC) exhibit quasi-sinusoidal variations within a certain range, with a period matching that of the vortex generator oscillation. Under the conditions of Re=50 and f=10—50 Hz, the PEC ranges from 0.75 to 1.52 and increases with frequency. Especially in the low frequency range, PEC shows a certain monotonicity. By introducing fin-shaped spoilers, the heat transfer efficiency of the microchannel has been significantly improved. Compared to a smooth rectangular microchannel (PEC=1), the PEC increases by 5% at Re=50 and f=10 Hz, and by 30% at Re=50 and f=50 Hz.

Key words: dynamic grid, heat transfer characteristic, thermodynamics, fin-shaped spoiler, microchannel, numerical simulation

中图分类号:

TK 124

陈巨辉, 苏潼, 李丹, 陈立伟, 吕文生, 孟凡奇. 翅形扰流片作用下的微通道换热特性[J]. 化工学报, 2024, 75(9): 3122-3132.

Juhui CHEN, Tong SU, Dan LI, Liwei CHEN, Wensheng LYU, Fanqi MENG. Study on the heat transfer characteristics of microchannels under the action of fin-shaped spoilers[J]. CIESC Journal, 2024, 75(9): 3122-3132.

图/表 17

图1 网格独立性验证

Fig.1 Grid independence verification

表1 网格无关性验证

Table 1 Mesh independence validation

网格数/10⁴	Nu	偏差/%
62	3.01	35
86	3.93	15.7
108	4.44	4.72
136	4.64	0.43
151	4.66	0

图2 模型验证

Fig.2 Model verification

图3 俯仰阻力系数对比

Fig.3 Comparison of pitching drag coefficients

图4 角度随时间的变化情况

Fig.4 Change in angle over time

图5 不同频率下Nusselt数随Reynolds数变化的趋势

Fig.5 The trend of Nusselt number varying with Reynolds number at different frequencies

图6 不同Reynolds数下Nusselt数随频率变化的趋势

Fig.6 The trend of Nusselt number varying with frequency under different Reynolds numbers

图7 Re=50时不同频率下Nusselt数随时间的变化情况

Fig.7 Variation of Nussel number over time at different frequencies when Re=50

图8 随时间变化的温度监测云图（Re=50，f=10 Hz）

Fig.8 The temperature monitoring cloud diagram over time (Re=50, f=10 Hz)

图9 随时间变化的温度云图（Re=50，f=10 Hz）

Fig.9 Temperature cloud diagram over time (Re= 50, f=10 Hz)

图10 随时间变化的速度云图（Re=50，f=10 Hz）

Fig.10 Velocity cloud diagram over time (Re=50, f=10 Hz)

图11 随时间变化的温度云图（Re=200，f=10 Hz）

Fig.11 Temperature cloud diagram over time (Re= 200, f=10 Hz)

图12 随时间变化的速度云图（Re=200，f=10 Hz）

Fig.12 Velocity cloud diagram over time (Re=200, f=10 Hz)

图13 随时间变化的温度云图（Re=200，f=50 Hz）

Fig.13 Temperature cloud diagram over time (Re=200, f=50 Hz)

图14 随时间变化的速度云图（Re=200，f=50 Hz）

Fig.14 Velocity cloud diagram over time (Re=200, f=50 Hz)

图15 Re=50时不同频率下fr随时间变化的趋势

Fig.15 Trend of friction coefficient with time at different frequencies of Re=50

图16 Re=50时不同频率下PEC随时间变化的趋势

Fig.16 Trend of PEC coefficient with time at different frequencies of Re=50

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