Flow boiling in copper and aluminium microchannels
Flow boiling in copper and aluminium microchannels
复制标题
铜和铝微通道中的流动沸腾
DOI：
10.1016/j.ijheatmasstransfer.2022.123101
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发表时间：
2022
影响因子：
5.2
通讯作者：
Al-Zaidi A
中科院分区：
文献类型：
--
作者：
Al-Zaidi A
在微通道蒸发器中，基底材料和活性侧特性可以影响气泡沸腾循环，从而影响传热速率和压降。本文对铜、铝材料制成的多微通道蒸发器内的流动沸腾流型、传热速率和压降进行了实验研究。HFE-7100被用作测试流体，在大气压力下，5 K入口过冷度，质量通量为50-250 kg/m2 s，壁面热通量高达174 kW/m2。所有散热器都制成通道宽度为0.46 mm，通道高度为0.46 mm，给出0.46 mm的通道水力直径。散热器基底区域的长度为25 mm，宽度为20 mm。实验结果表明，铜和铝的流动模式相似，即气泡，段塞，搅拌和环状流。铝散热器中的传热系数比铜散热器中的传热系数高12%（平均值）。在铝散热器中测得的压降比铜散热器高28%（平均值）。然而，使流体移动通过热交换器所需的附加泵送功率对于该因素是显著的来说是小的。表面的SEM图像显示，与铜表面相比，具有清晰切割痕迹的铝表面中的空腔（可能的成核位点）的数量更高。这可以解释不同的压降和传热行为。本研究的结果表明，铝散热器可以提供可比的热性能的铜散热器，也可以推荐用于冷却高热流系统。
The substrate material and active side characteristics can affect the bubble ebullition cycle and consequently the heat transfer rate and pressure drop in microchannel evaporators. This paper presents an experimental study on flow boiling patterns, heat transfer rates and pressure drop in multi-microchannels evaporators made of copper and aluminium. HFE-7100 was used as the test fluid at atmospheric pressure, 5 K inlet sub-cooling, mass flux of 50-250 kg/m2s and wall heat flux up to 174 kW/m2. All heat sinks were made with channel width 0.46 mm, channel height 0.46 mm, giving a 0.46 mm channel hydraulic diameter. The heat sink base area was 25 mm in length and 20 mm in width. The experimental results showed that similar flow patterns were visualised for copper and aluminium namely bubbly, slug, churn and annular flow. The heat transfer coefficient in the aluminium heat sink was 12% (average value) higher than that found in the copper heat sink. The measured pressure drop in the aluminium heat sink was 28% (average value) higher compared to the copper heat sink. However, the additional pumping power required to move the fluid through the heat exchanger is small for this factor to be significant. The SEM images of the surface revealed that the number of cavities (possible nucleation sites) was higher in the aluminium surface with clear-cutting marks compared to the copper surface. This may explain the different pressure drop and heat transfer behaviour. The results of the present study indicate that aluminium heat sinks can offer comparable thermal performance to that of copper heat sinks and can also be recommended for cooling high heat flux systems.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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DOI：
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发表时间：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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