三叶型花瓣扭曲螺旋缠绕管换热性能的研究

Study on heat transfer performance of twisted spiral winding tube with three-leaf petals

建立三叶型花瓣扭曲螺旋缠绕管的几何模型,对管内的流动和传热特性进行模拟,分析不同结构参数对换热性能的影响,利用响应面法对该管的换热性能进行拟合。结果表明,与传统的光管缠绕管相比,三叶型花瓣扭曲螺旋缠绕管产生的扭转力改善了温度分布不均的现象且换热性能提高了40%;当缠绕半径取最小值,节距取最大值时,换热系数h可达到最大值4.16 kW/(m^(2)·K);三阶多项式能够最准确地描述换热系数与输入参数的关系,其中h的MRS为0.17%,RMSE为0.006,R2为0.999。

A geometric model was developed for a three-lobed petal-twisted helical coil tube,and its flow and heat transfer characteristics were investigated through simulation.The impact of different structural parameters on the heat transfer performance was analyzed,and the heat transfer performance of the tube was fitted using the response surface methodology.The results demonstrate that compared to conventional straight tubes,the three-lobed petal-twisted helical coil tube generates twisting forces that alleviate temperature unevenness and improve heat transfer performance by 40%.When the coil radius is minimized and the pitch is maximized,the heat transfer coefficient h reaches its maximum value of 4.1 kW/(m^(2).K).A third-order polynomial accurately describes the relationship between the heat transfer coefficient and input parameters,with an MRS of 0.17%,RMSE of 0.006,and R²of 0.999 for h.