The main aim of the present work is to analyze the improvement of heat transfer through the simultaneous use of concave and convex inner and outer corrugated tubes within a concentric mini-tube heat exchanger. The purpose was to conduct a numerical study of the thermo-hydraulic characteristics of a concentric mini-tube heat exchanger with V-shaped corrugations, while considering different cases. In addition, hot water and cold water were used as working fluids. The simulations were performed for a countercurrent configuration, with mass flow rates of hot water and cold water ranging between 0.04 and 0.2 kg/s. The inlet temperature of hot fluid was set at 40 °C and that of cold fluid at 15 °C. The finite volume method was used to solve the mathematical model that allowed obtaining the temperature distribution, the heat transfer rate, as well as the entropy generation. These parameters were evaluated for different arrangements of the corrugated tubes. The results obtained showed that corrugations lead to improvement in the heat transfer rate due to higher exchange surface. A better average Nusselt number was also obtained from the arrangement of concave corrugated tubes with a phase shift angle of 180°.

本工作的主要目的是通过在同心微型管式换热器中同时使用凹凸形的内，外波纹管来分析传热的改进。目的是在考虑不同情况的情况下，对具有V形波纹的同心微型管式换热器的热工水力特性进行数值研究。另外，热水和冷水被用作工作流体。针对逆流配置进行了仿真，热水和冷水的质量流率在0.04到0.2 kg / s之间。将热流体的入口温度设置为40°C，将冷流体的入口温度设置为15°C。有限体积法用于求解数学模型，该数学模型允许获得温度分布，传热速率，以及熵的产生。对于波纹管的不同布置，评估了这些参数。所得结果表明，波纹由于较高的交换表面而导致传热速率的改善。从具有180°相移角的凹形波纹管的布置也获得了更好的平均努塞尔数。