A Study on effects of the shape and arrangement of Dimples on Heat Transfer performance

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  • ディンプル形状・配置の違いが熱伝達性能に及ぼす影響に関する研究

Abstract

<p>To avoid global warming, high-performance of Double Tube Heat Exchanger constituting car air conditioner is required. In order to realize this, Attention has been paid to placing dimples in the heat exchanger that are expected to improve heat transfer efficiency. However, there are few studies that clarified the optimal shape of dimples and the detailed flow structure inside the tube depending on the arrangement method. So, in this study, for establishing an optimum design method for dimples at a low cost, numerical thermal flow analysis by in-house code is carried out and investigation was conducted on the influence of the dimples inside the pipe on the flow structure and heat transfer characteristics. As a result, elliptical shaped dimple did not result in favorable results compared with the circular shaped dimple. In addition, it was suggested that protrusion is more effective when comparing recesses and protrusions with the same shape.</p>

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