新型不锈钢波纹管性能及强化传热的实验研究

An Experimental Study of the Performance of Novel Stainless Steel-made Corrugated Tubes and Their Intensified Heat Transfer

新型不锈钢波纹管是经特殊工艺胀波凸起成型为多层波纹管 ,管内流动呈等直径流束型式和弧形流束型式 ,使流速和压力周期性的变化 ,冷热流体产生强烈扰动 ,实现了复合强化换热。文中对该波纹管进行了承压能力试验 ,并在水 -水换热条件下 ,对波纹管强化换热规律进行了实验研究 ,分析了新型波纹管的强化传热机理 ,并给出该管的优化尺寸范围 ,为波纹管在换热器中的应用提供了理论依据。

Corrugated tubes made of a new type of stainless steel are multi-layer ones fabricated by the use of a special technique involving a concave wave formation process. In-tube flows are of an equal-diameter flow cluster type and arc-shaped flow cluster type, which can introduce a periodic change of flow speed and pressure. With the production of an intensive perturbation between cold and hot fluids a compound intensified heat exchange is realized. The corrugated tubes were tested for their pressure-bearing capacity and an experimental study of intensified heat exchange law was performed under water-water heat exchange conditions. The intensified heat exchange mechanism of the corrugated tubes was analyzed and an applicable range of optimized dimensions determined for the tubes, thus providing a theoretical basis for the use of corrugated tube-based heat exchangers.