粗糙度对Gyroid型仿生胞元换热影响规律研究

Study on the influence of surface roughness on the heat trans-fer in Gyroid bionic cells

中文关键词: TPMS  表面粗糙度  数值模拟  传热

英文关键词: triply periodic minimal surface  surface roughness  numerical simulation  heat transfer

中文摘要:

      三周期极小曲面（TPMS）结构因其高空间利用率、低重量和高刚度，被广泛应用于微通道换热器的设计。针对Gyroid型仿生胞元换热结构，通过建立数值模型并结合增材制造实验验证的方法，研究结构内部流动机理及表面粗糙度对换热性能的影响。研究结果表明，与实验数据对比，数值模拟最大出口压力误差3.7%，最大出口温度误差3%。Gyroid换热器压降及温降主要发生在结构入口处，随着雷诺数增大，结构压降增大，温差降低；增加表面粗糙度会导致换热器压降及温降均升高，当壁面粗糙度为100um时，结构压降最大增加44.7%，温降最大增加8.05%。此外，表面粗糙度增加，努塞尔数（Nu）及摩擦系数（f）也随之增大，表明表面粗糙度的增加虽然提高了换热效率，但也增加了流动阻力。期望能够为工业应用中TPMS结构的选择和制造过程提供参考。

英文摘要:

      Triply periodic minimal surface (TPMS) structures are widely used in the design of microchannel heat exchangers due to their high space utilization, low weight and high stiffness. For the Gyroid bionic cells heat exchange structure, the internal flow mechanism and the influence of surface roughness on heat ex-change performance were studied by establishing a numerical model for numerical simulation and com-bining with additive manufacturing experiments. The research results show that compared with the exper-imental data, the maximum outlet pressure error of the numerical simulation is 3.7%, and the maximum outlet temperature error is 3%. The internal flow analysis indicates that the pressure drop and temperature drop at the Gyroid heat exchanger mainly occur at the structure inlet. As the Reynolds number increases, the pressure drop the structure increases, and the temperature difference decreases. Increasing the surface roughness will lead to an increase in the pressure drop and temperature drop at the heat exchanger. When the wall roughness is 100 μm, the pressure drop of the structure increases by a maximum of 44.7%, and the temperature drop increases by a maximum of 8.05%. In addition, as the surface roughness increases, the Nusselt number (Nu) and friction coefficient (f) also increase, indicating that although the increase in surface roughness improves the heat exchange efficiency, it also increases the flow resistance. It is ex-pected to provide a reference for the selection and manufacturing process of TPMS structures in industri-al applications.