CAJ | 학술논문

相对旋转两同轴套管间的涡旋流动，能够带来二次流强化传热传质作用，在航空、水处理、生态保护、生物工程和膜分离等领域都具有广泛的应用价值。本文使用Fluent软件，对同轴套管间涡旋流动及传热特性进行数值模拟，考察了内管转速、内外管壁面温差等操作参数变化对同轴套管间流体传热性能的影响，分析了涡旋流动与传热效率之间的关联关系。模拟结果表明：内管转速增加在流场中形成泰勒涡，涡流扰动增大了高温壁面与流体间的热流密度，增强了流体传热效率。增大内外管壁面温差，也可加强流体传热性能，但其强化作用不及内管转速的强化作用显著。受流场中泰勒涡影响，流体速度、温度及热流密度沿轴向的分布都呈正弦状周期性波动，在相邻两涡交界面处，流体传热性能最好，在涡中心处的传热性能最差。
상대선전량동축투관간적와선류동，능구대래이차류강화전열전질작용，재항공、수처리、생태보호、생물공정화막분리등영역도구유엄범적응용개치。본문사용Fluent연건，대동축투관간와선류동급전열특성진행수치모의，고찰료내관전속、내외관벽면온차등조작삼수변화대동축투관간류체전열성능적영향，분석료와선류동여전열효솔지간적관련관계。모의결과표명：내관전속증가재류장중형성태륵와，와류우동증대료고온벽면여류체간적열류밀도，증강료류체전열효솔。증대내외관벽면온차，야가가강류체전열성능，단기강화작용불급내관전속적강화작용현저。수류장중태륵와영향，류체속도、온도급열류밀도연축향적분포도정정현상주기성파동，재상린량와교계면처，류체전열성능최호，재와중심처적전열성능최차。
The vortex flow which occurs in annulus between rotating inner cylinder and concentric fixed outer cylinder can enhance heat transfer and mass transfer performances of fluid , and has wide application value in engineering fields such as air , water treatment , ecological protection , biotechnology and mem-brane separation .The paper used fluent software to simulate the vortex flow in annulus between rotating inner cylinder and concentric fixed outer cylinder and feature of heat transfer , and investigated the effect of varying inner cylinder rotating velocities and temperature differences between the two cylinders on heat transfer performances , and analyzed the relation between flow characteristics and heat transfer efficien-cies.Results show that Taylor vortices is formed in flow field with the increase of inner cylinder rotating velocity, intensive disturbance increases the density of heat transfer between high temperature face and fluid,and strengthens the efficiency of fluid heat transfer .The increase of temperature difference can also improve heat transfer efficiency of fluid , but the effect of its improvement is less obvious than that of inner cylinder rotating velocity .Due to the influence of Taylor vortices , the distribution of velocity field , tem-perature field and heat flux density presents a sinusoidal periodic fluctuation along axial direction .The heat transfer performance at the interface between two vicinity vortices is the best and that at the center of vortices is the worst .