摘要
以人字形波纹板式换热器为基础,建立了完整的三板双流道耦合传热模型,并进行了数值分析。结果表明:在单边流动方式下流体出现了流量分配不均的情况,在导流区较为严重,流速与流量分布规律相同,在换热区靠近触点的位置流速更大。对计算模型施加展向周期性边界条件,发现波纹板的温度分布、总传热系数与常见的单元传热相比,误差更小。因此,在进行板式换热器模拟计算时,需要考虑耦合传热。同时分析了局部努塞尔数和二次流强度的变化趋势,发现在主流方向上,局部努塞尔数和二次流强度的变化趋势基本相同,在触点位置都出现了剧烈的变化,增强了换热,因此在设计板式换热器时,可以考虑通过适当改变结构以增加触点个数来增强换热。
Based on the herringbone corrugated plate heat exchanger,a complete three-plate and two-channel coupled heat transfer model was established,and a detailed numerical analysis was carried out.The results show that the flow distribution is uneven in the unilateral flow mode,which is more serious in the diversion zone,and the flow velocity is the same as the flow distribution law,and the flow velocity is greater in the heat exchange zone near the contact.The radial periodic boundary condition is applied to the computational model,and it is found that the temperature distribution and total heat transfer coefficient of the corrugated plate are smaller than those of the common element heat transfer.Therefore,coupled heat transfer needs to be taken into account when performing plate heat exchanger simulation calculations.At the same time,the variation trend of local Nussel number and secondary flow intensity was analyzed,and it was found that in the main flow direction,the variation trend of local Nussel number and secondary flow intensity was basically the same,and there was a drastic change in the contact position,which enhanced the heat exchange.
作者
朱利兵
王良璧
ZHU Libing;WANG Liangbi(College of Mechanical and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Railway Vehicle Thermal Engineering Ministry of Education(Lanzhou Jiaotong University),Lanzhou 730070,China)
出处
《甘肃科学学报》
2024年第6期121-128,共8页
Journal of Gansu Sciences
基金
国家自然科学基金项目(52066009)
甘肃省高校科研创新平台重大培育项目(2024CXPT-13)。
关键词
板式换热器
数值模拟
导流区
周期性边界条件
二次流
Plate heat exchanger
Numerical simulation
Flow guide zone
Periodic boundary conditions
Secondary streams
作者简介
朱利兵(1998-),男,甘肃环县人,硕士研究生,研究方向为车辆热工.E-mail:1271647561@qq.com;通信作者:王良璧,E-mail:lbwang@mail.lzjtu.cn。
