基于热流固耦合的微通道冷却系统模拟  

Simulation of a Microchannel Cooling System Based on Thermal-Fluid-Solid Coupling

作　　者：潘艳秋[1] 张春超 张威[1] 谷菁 刘万发[2] 何书通 Pan Yanqiu;Zhang Chunchao;Zhang Wei;Gu Jing;Liu Wanfa;He Shutong(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China)

机构地区：[1]大连理工大学化工学院,大连116024 [2]中国科学院大连化学物理研究所,大连116023

出　　处：《天津大学学报（自然科学与工程技术版）》2022年第4期364-370,共7页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(61705230).

摘　　要：浸入式直接液冷固体激光器的设计理念自提出以来即受到广泛关注,其增益介质与微通道内冷却介质直接接触进行换热的方式能显著提高传热效果.微通道的结构、流体流动及增益介质热负荷直接影响激光器光程差(OPD),从而影响激光出光质量.基于实际浸入式直接液冷固体激光器操作条件优化的需要,建立二薄片三通道(坐标轴x正方向为双流道流动方向)小型固体激光器冷却系统几何模型,并将热流固耦合方法和OPD计算模型相结合,模拟研究微通道内雷诺数、增益介质热负荷对OPD的影响.模拟结果表明:冷却系统的转捩雷诺数为2600;相同热负荷下,随着微通道内流动雷诺数增大,OPD波峰与波谷的位置向x轴的负方向(单流道流动方向)移动、峰谷值增大;相同雷诺数下,随着增益介质热负荷增大,增益介质热变形程度增大,OPD的波峰与波谷位置不变、峰谷值增大;为保证固体激光器出光质量,当实际热负荷为2000W要求时,由于增益介质所受最大应力和微通道层流流动的限制,雷诺数应控制在2200~2600范围内;当雷诺数为2300时,由于增益介质所受最大应力的限制,热负荷应控制在2400W内.建立的热流固耦合并结合OPD计算模型方法,可面向固体激光器的研发与应用,指导实际直接液冷固体激光器操作条件的优化.The design concept of immersed direct liquid-cooled solid-state lasers has received widespread attention since it was introduced.The gain medium and cooling medium are directly contacted for heat exchange,which can greatly improve the heat transfer effect.The optical path difference(OPD)of the laser is affected by the structure of the microchannel,fluid flow,and heat load of the gain medium,thereby affecting lightquality.Based on the need to optimize operating conditions of the actual solid-state laser,this study established a geometric model of the two-chip and three-channel cooling system,setting the positive direction of the x-axis as the flow direction of the dual-channel.The thermal-fluid-solid coupling method and OPD calculation model were combined to simulate the influence of the Reynolds number and heat load on the OPD.Results show that the transition Reynolds number of the cooling system is 2600.Under the same heat load,as the Reynolds number in the microchannels increases,the peak and valley positions of the OPD move to the flow direction of the single channel,and the peak-to-valley value increases.Under the same Reynolds number,as the heat load increases,the thermal deformation of the gain medium increases,the peak and valley positions of the OPD remain unchanged,and the peak-to-valley value increases.To ensure light qual-ity,the Reynolds number should be controlled within the range of 2200—2600 when the actual heat load is 2000W,and the heat load should be controlled within 2400W when the Reynolds number is 2300.The thermal-fluid-solid coupling model combined with the OPD calculation method can be used for the development and applica-tion of solid-state lasers and guide the optimization of the operating conditions of actual direct liquid-cooled solid-state lasers.

关 键 词：微通道 热流固耦合 固体激光器 雷诺数 热负荷 

分 类 号：TN248.1[电子电信—物理电子学]