A local thermal resistance method for analyzing and enhancing double-sided heat transfer processes

Excessive carbon emissions are one of the biggest global challenges in recent years. Therefore, it is necessary to investigate advanced design and evaluation methods to develop high-efficiency heat exchangers. The traditional thermal resistance analysis method uses the lumped parameter method for analysis and treats the fluid domain as a whole, which makes it difficult to analyze and regulate the local heat transfer processes. To solve this problem, a local thermal resistance analysis method in the fluid domain is proposed. By analyzing the thermal resistance magnitude of each thermal resistance region in the fluid domain, the expression of local thermal resistance is obtained. The local thermal resistance ratio and the total local thermal resistance are defined to reflect the local heat transfer processes. The local thermal resistance characteristics of double-sided heat transfer under forced convection are investigated. By studying the local thermal resistance ratio of the fin-enhanced structure, accurate and effective structural improvement was achieved through local thermal resistance method. The local thermal resistance method facilitates a comprehensive and accurate presentation of the local heat transfer.