内螺旋连续式铜换热器换热分析与数值模拟

Heat transfer analysis and numerical simulation of internal spiral continuous copper heat exchanger

为了提高低流量情况下换热器的换热效率,基于有限元模拟技术,采用CFD软件对内螺旋连续式换热器和传统弓形式换热器的换热进行数值模拟。结合场协同理论及数值分析,研究了两者之间的温度场、流速场、压力场对换热效率的影响。结果表明:相较于传统弓形式换热器,内螺旋连续式换热器在流量较小的情况下流速场中有射流、扰流、二次流存在,有更少的流动死区、更大的换热面积,同时扰流的存在加大了换热系数。综合数值模拟与分析得出,在流量较小的情况下,通过增大换热面积与换热系数,内螺旋连续式换热器明显比传统弓形式换热器效率高,换热效率提高约12%。该分析为低流量情况下换热器的传热效率、强化传热的研究提供了有效理论依据。

In order to improve the heat transfer efficiency of heat exchanger at low flow rate,the heat transfer of internal spiral continuous heat exchanger and traditional bow heat exchanger was simulated by CFD software based on finite element simulation technology,and combined with the field synergy theory and numerical analysis,the effects of temperature field,velocity field and pressure field on heat transfer efficiency were studied.The results show that compared with the traditional bow heat exchanger,there are jet flow,turbulence,secondary flow,less dead zone and larger heat transfer area in the flow field of the internal spiral continuous heat exchanger,and the turbulence increases the heat transfer coefficient.The results of numerical simulation and analysis show that,when the flow rate is small,the efficiency of the internal spiral continuous heat exchanger is obviously higher than that of the traditional bow heat exchanger,and the heat transfer efficiency increases by about 12%by increasing the heat transfer area and the heat transfer coefficient.The analysis provides an effective theoretical basis for the study of heat transfer efficiency and heat transfer enhancement in the case of low flow rate.