Thermal-hydraulic performance of sinusoidal channel printed circuit heat exchanger

doi:10.11949/0438-1157.20200491

Abstract

Abstract:

Printed circuit heat exchanger (PCHE) is a promising candidate in the field of supercritical CO₂ Brayton cycle due to its high thermal efficiency and compactness. In this paper, the effects of wave angles (15°—30°) on the heat transfer performance of sinusoidal channels under turbulent conditions are numerically studied at first. The results show that the heat transfer performance increases with the increase of wave angle (the maximum increase of the heat transfer rate is 7.1%), while the pressure drop on the hot side increases more significantly when compared with that on the cold side. Secondly, the local flow and heat transfer characteristics in the different regions of the channels are analyzed by pitches. Zones with large and small temperature differences are observed in the inlet zones on the hot and cold sides, respectively. Meanwhile, the inlet zones are found to be related to great pressure drops and should be carefully optimized. Finally, a novel hybrid structure of sinusoidal channel combined with straight channel is designed and its thermal hydraulic performance is tentatively investigated.

Key words: printed circuit heat exchanger, supercritical carbon dioxide, sinusoidal channel, thermal hydraulic performance, numerical simulation

摘要：

印刷电路板换热器换热性能好、紧凑性高，在超临界CO₂布雷顿循环等领域有着广阔的应用前景。本文通过数值计算，首先比较了湍流条件下15°～30°范围内不同波纹角对正弦波纹流道流动换热性能的影响，结果表明，波纹流道内的换热效果随波纹角的增大而增强（换热量最大增长了7.1%），且热侧的压降相对于冷侧增大更明显。其次，分节研究并分析了流道内不同区域的局部流动换热特性，发现了在热侧和冷侧入口区域各存在着1个大、小温差区，同时，需要对入口处进行合理的优化设计以减小入口处的压降。最后，进一步设计了一种“正弦波纹+直通道”的复合结构并初步探究了该结构的流动换热性能。

关键词: 印刷电路板换热器, 超临界CO₂, 正弦波纹流道, 热工水力性能, 数值模拟

CLC Number:

TK 172

Yigao LYU, Qing LI, Zhexi WEN. Thermal-hydraulic performance of sinusoidal channel printed circuit heat exchanger[J]. CIESC Journal, 2020, 71(S2): 142-151.

吕义高, 李庆, 文哲希. 正弦波纹流道印刷电路板换热器热工水力性能[J]. 化工学报, 2020, 71(S2): 142-151.

Figures/Tables 15

Fig.1 Geometric model

Table 1 Boundary conditions

参数	冷侧流体		热侧流体
参数	入口	出口	入口	出口
T_in /K	350	—	675	—
p_out /MPa	—	20	—	8
m_in /(kg?h)	0.6、1.0、1.4、1.8	—	0.6、1.0、1.4、1.8	—

Fig.2 Grid structure of computational domain cross section

Fig.3 Grid independence test

Fig.4 Comparison between numerical results and experimental data

Fig.5 Thermal hydraulic performance of wavy channels with various angle

Fig.6 Variations of temperature difference between inlet and outlet and heat transfer rate at each pitch

Fig7 Temperature variations along flow direction on cold and hot sides when θ=15°

Fig.8 Variations of Nu and Re at each pitch along flow direction

Fig.9 Variations of pressure drop Δpp and f at each pitch along flow direction

Fig.10 Velocity field at first pitch on hot side

Fig.11 Hybrid structure of sinusoidal channel combined with straight channel

Fig.12 Local flow and heat transfer characteristics along the flow direction of different structure channels

Fig.13 Overall performance of sinusoidal and hybrid structure channels

Fig.14 Samples of other hybrid structure remain to be further studied

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