Abstract
Visualization experiments on flow boiling in ultra-shallow (aspect ratio=5) multi-channels under various operating conditions have been conducted. Compared with the rectangular configuration, parallelogram configuration is proposed as an effective design to achieve effective enhancement in flow and heat transfer during the flow boiling in ultra-shallow multi-channels. The behaviors of the confined bubbles are explored in detail with high quality photos, which clarifies the mechanistic characteristics of flow and heat transfer in the ultra-shallow multi-channels with different channel configurations. By tracking the pressure fluctuation and capturing the infrared image, the improvement in the flow and the heat transfer are also depicted. The experimental results verify the advantage of the parallelogram configuration in suppressing the flow instability of the multi-channels system. This work provides a novel and easy-fabricating technology to enhance the flow and heat transfer capability in the ultra-shallow multi-channels, which guides the further utilization and wider application.
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