A combined tool with stacked blades was developed to efficiently fabricate microchannel plates by using the multi-blade milling process. The microchannel plates with 0.632 mm in hydraulic diameter and 40 mm in length were then used to assemble the microchannel heat exchanger. The thermal performance of microchannel heat exchanger was experimentally investigated with different flow rates. After the forming mechanism of multi-blade milling process was analyzed, the influence of processing parameters on microchannel geometry was investigated. The results showed that the cutting depth and feed rate exhibited great influence on the top width and the spacing of microchannel. On the other hand, the microchannel geometry had been less affected by the cutting speed. Compared with a heat exchanger without microchannels, the heat transfer coefficient per unit volume of the microchannel heat exchanger was significantly increased. When the flow rate was 900 ml min−1, the heat transfer coefficient per unit volume of the microchannel heat exchanger could reach to 735 kW m−3 K−1 with a corresponding pressure drop of 18.2 kPa. In a word, the developed heat exchanger with microchannel plates exhibits an enhanced thermal performance and good pressure drop characteristics.
The International Journal of Advanced Manufacturing Technology – Springer Journals
Published: Dec 2, 2017
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