化工进展2023，Vol.42Issue(12)：6207-6217,11.DOI:10.16085/j.issn.1000-6613.2023-0106
射流冲击纳米流体对半圆形螺旋通道传热特性的影响
Effect of jet impingement nanofluid on heat transfer characteristics of semicircular spiral channels
摘要
Abstract
To improve the heat exchange effect of the semicircular spiral channel outside the tubular reactor,a jet inlet was set on the wall of the traditional spiral channel.Three kinds of nanofluids(CuO-H2O,Al2O3-H2O and TiO2-H2O)were used as heat transfer fluids,respectively.Based on Mixture mixing model,the influence of different nanofluids on the heat exchange and flow characteristics of the semi-circular spiral channel at different Re(10000-36000)and jet velocity ratios was investigated.The heat transfer enhancement factors PECj0 and PECj were used to evaluate the comprehensive heat transfer enhancement before and after increasing the jet flow in the semi-circular spiral channel.The results showed that at the jet speed ratio ε=0-5,the pressure drop of Al2O3-H2O nanofluids was highest,while that of CuO-H2O nanofluids was lowest.Al2O3-H2O nanofluids exhibited the best heat transfer performance at ε=0,with the average Nu number 1.31 times that of H2O.Compared to ε=0,the average Num of the spiral channel increased by 52.01%at ε=1-5.With the increased jet velocity ratio,the higher the turbulent kinetic energy,the better the mixing effect between jet fluid and main stream fluid.The influence range of jet fluid at each velocity ratio was 0°≤θj≤50°.When ε=3,the spiral channel generates three vortex structures.PECj0 increased first and then decreased with the rising Re,reaching its maximum value at Re=20173,while PECj increased with the rising jet velocity ratio.Overall,the heat transfer enhancement effect of jet impinging on Al2O3-H2O nanofluids in spiral channels was the best in this study.关键词
半圆形螺旋通道/纳米流体/射流/强化传热/数值模拟Key words
semicircular spiral channel/nanofluids/jet/enhanced heat transfer/numerical simulation分类
能源科技引用本文复制引用
王超,王宗勇,张伟,韩旭,刘磊,付启慧..射流冲击纳米流体对半圆形螺旋通道传热特性的影响[J].化工进展,2023,42(12):6207-6217,11.基金项目
辽宁省教育厅基础研究项目(LJ2020014). （LJ2020014）
