CuO-H_(2)O纳米流体对半圆形螺旋通道内湍流传热特性分析  

Analysis on Turbulent Heat Transfer Characteristics of CuO-H_(2)O Nanofluids in the Semi-circular Helical Tube

作　　者：王超[1] 王宗勇[1] 张伟[1] 韩旭[1] 刘磊 付启慧 WANG Chao;WANG Zong-yong;ZHANG Wei;HAN Xv;LIU Lei;FU Qi-hui(College of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shengyang Liaoning 110142,China;College of automobile,Anyang vocational and technical college,Anyang Henan 455000,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110142 [2]安阳职业技术学院汽车学院,河南安阳455000

出　　处：《当代化工》2023年第11期2720-2725,共6页Contemporary Chemical Industry

基　　金：辽宁省教育厅基础研究项目(项目编号:LJ2020014)。

摘　　要：基于Mixture模型模拟了半圆形螺旋通道内CuO-H_(2)O纳米流体的传热特性,在雷诺数Re=9000~20000范围内,分析了不同纳米流体体积分数(φ=0.1%~2%)下的螺旋通道传热特性,并利用传热强化因子PEC和协同数Fc评价了半圆形螺旋通道的综合强化传热性能。研究结果表明:在纯水中添加CuO纳米颗粒能够提升流体的导热能力,从而提高流体的传热效果,与纯水相比平均努赛尔数Nu最高可提升7.06%;当纳米流体体积分数φ≤1.0%时,平均努赛尔数Nu随着体积分数φ的增大而提高,而当φ>1.0%时,Nu随着体积分数φ的增大而降低;在所研究的雷诺数范围内,系统压降均随着体积分数φ的增加而增大,但增加相对幅度较小,最高体积分数压降相比最低体积分数增幅小于4.17%;沿螺旋通道主流流动方向,截面努赛尔数Nuc逐渐降低,降幅最大为8.17%;随体积分数φ的增加,PEC和Fc呈现先增大后降低的变化规律,φ=1.0%时,PEC和Fc取得最大值。The heat transfer characteristics of CuO-H_(2)O nanofluids in the semi-circular helical tube were simulated on the Mixture model.The comprehensive heat transfer enhancement performance of the semicircular helical channel was evaluated by using the heat transfer enhancement factor PEC and the synergy number Fc in the range of Re=9000~20000 and different volume fraction of nanofluids(φ=0.1%~2%).The results showed that adding CuO nanoparticles in pure water could improve the thermal conductivity of the fluid,thus improving the heat transfer effect of the fluid.the average Nusselt number compared with pure water was increased by up to 7.06%;when the nanofluidφ≤1.0%,the average Nusselt number increased with the increase of the density of fluids,and whenφ>1.0%,Nu decreased with the increase of the density of fluids;Within the studied Reynolds number range,the pressure drop of the system increased with the increase of the density of fluids,but the increase was relatively small,the pressure drop of the highest density fluids increased by less than 4.17%compared with the lowest density of fluids;Alonging the main flow direction of the spiral channel,the cross-section Nuc gradually decreased,and the maximum decrease value was 8.17%;With the increase of the density of fluids,PEC and Fc both increased first and then decreased.Whenφ=1.0%,the PEC and Fc reached the maximum value.

关 键 词：半圆形螺旋通道 纳米流体 强化传热 数值模拟 

分 类 号：TQ124[化学工程—无机化工]