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<p>In this study, various round-shaped ribs-round, double round, and point round-were proposed, and their heat transfer and pressure loss performances were experimentally compared with conventional orthogonal rib. The heat transfer coefficient (HTC) was measured using the transient liquid crystal technique, and the effects of ribbed channel configuration on flow field were analyzed using a commercial software. Results showed that the round-shaped ribbed channels showed up to a 16 % increase in the Nusselt number (Nu) ratio compared to the orthogonal ribbed channel. Despite the higher pressure loss, the round ribbed channel exhibited superior heat transfer, resulting in a thermal performance factor (TP) surpassing the orthogonal ribbed channel. The double round ribbed channel, on the other hand, indicated comparable TP with the orthogonal ribbed channel. The point round ribbed channel, benefiting from its low pressure loss, also achieved a higher TP than that of the orthogonal ribbed channel.</p>

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Heat transfer augmentation in a stationary 1:1 square channel with round shaped ribs

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Young Jun Kang,
  • Jongsu Oh,
  • Woojun Kim,
  • Jae Su Kwak

摘要

In this study, various round-shaped ribs-round, double round, and point round-were proposed, and their heat transfer and pressure loss performances were experimentally compared with conventional orthogonal rib. The heat transfer coefficient (HTC) was measured using the transient liquid crystal technique, and the effects of ribbed channel configuration on flow field were analyzed using a commercial software. Results showed that the round-shaped ribbed channels showed up to a 16 % increase in the Nusselt number (Nu) ratio compared to the orthogonal ribbed channel. Despite the higher pressure loss, the round ribbed channel exhibited superior heat transfer, resulting in a thermal performance factor (TP) surpassing the orthogonal ribbed channel. The double round ribbed channel, on the other hand, indicated comparable TP with the orthogonal ribbed channel. The point round ribbed channel, benefiting from its low pressure loss, also achieved a higher TP than that of the orthogonal ribbed channel.