锥纹管换热器流体流动与传热性能实验研究

波纹换热管是一种具有特殊形状的双面强化传热管，传热效率高，轴向变形补偿能力强，被广泛应用于工程实际中。锥纹管是在传统波纹管的基础上进行改进得到的新管型，具有优越的强化传热特性。针对锥纹管弓形折流板换热器的流动与传热特性进行实验研究，并将其与传统光滑管弓形折流板换热器进行对比，实验结果表明：在所测试流量范围内，当管程介质为水，壳程介质分别为水和32#液压油时，与光滑管换热器相比，锥纹管换热器的总传热系数分别提高了5%～40%和5%～20%,管程压力降升高了20%～70%,壳程压力降降低了10%。同时进行了相关数值模拟计算，并基于实验和模拟结果，对以水为介质的锥纹管换热器的管壳程传热准则关联式进行了拟合，数值验算结果表明，关联式可以满足工程设计的精度要求。

Experimental study of fluid flow and the heat transfer performance of a conically-corrugated tube heat exchanger

Corrugated heat exchange tube is a special double-sided heat transfer tube with high heat transfer efficiency and good compensation ability for axial deformation, and has been widely used in engineering. Conically-corrugated tube is a new type of tube which is improved on the basis of traditional bellows and has good heat transfer enhancement characteristics. In this paper, flow and heat transfer characteristics of conically-corrugated tube heat exchanger with segmental baffle are experimentally studied and compared with conventional smooth tube segmental baffle heat exchanger. The experimental results show that in the tested flow rate range, when the tube side medium is water and the shell side medium is water and 32# hydraulic oil respectively, compared with the smooth tube heat exchanger, the total heat transfer coefficient of the conically-corrugated tube heat exchanger is increased by 5%-40% and 5%-20% respectively, the tube side pressure drop is increased by 20%-70%, and the shell side pressure drop is reduced by 10% when the shell side medium is water. When the shell side medium is 32# hydraulic oil, there is little difference in the pressure drop of the shell side. Relevant numerical simulation calculations are carried out, based on the experimental and simulation results, the correlation formula of tube and shell side heat transfer criterion of conically-corrugated tube heat exchanger is fitted when the heat transfer media in both shell and tube sides are water in this paper. The numerical verification results show that the correlation formula can meet the precision requirement of engineering design.