化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2014年
12期
3189-3193
,共5页
何长江%关昌峰%张震%何立臣%阎华%杨卫民
何長江%關昌峰%張震%何立臣%閻華%楊衛民
하장강%관창봉%장진%하립신%염화%양위민
转子%孔径比%努塞尔数%阻力系数%综合评价因子
轉子%孔徑比%努塞爾數%阻力繫數%綜閤評價因子
전자%공경비%노새이수%조력계수%종합평개인자
rotors%aperture ratio:Nusselt number%friction factor%comprehensive performance(PEC)
以60%甘油水溶液为管程介质,对内置不同孔径开孔螺旋叶片转子换热管过渡区传热和阻力特性进行了实验研究。对光管性能进行了实验验证,以保证实验结果的可靠性。同时,对比分析了转子开孔孔径对其强化传热性能的影响,实验结果表明:内置S=0.375螺旋叶片转子换热管努塞尔数比内置S=0以及S=0.25螺旋叶片转子换热管的努塞尔数分别高出9.5%和21%左右,阻力系数高出9%左右。而对于综合性能而言,内置S=0.375螺旋叶片转子换热管的综合评价因子大于内置S=0螺旋叶片转子换热管的综合评价因子,内置S=0.25螺旋叶片转子换热管综合评价因子最小。综上可得,较大直径的开孔能提高转子的综合性能,但是较小直径的开孔反而会减弱转子的强化传热综合性能。
以60%甘油水溶液為管程介質,對內置不同孔徑開孔螺鏇葉片轉子換熱管過渡區傳熱和阻力特性進行瞭實驗研究。對光管性能進行瞭實驗驗證,以保證實驗結果的可靠性。同時,對比分析瞭轉子開孔孔徑對其彊化傳熱性能的影響,實驗結果錶明:內置S=0.375螺鏇葉片轉子換熱管努塞爾數比內置S=0以及S=0.25螺鏇葉片轉子換熱管的努塞爾數分彆高齣9.5%和21%左右,阻力繫數高齣9%左右。而對于綜閤性能而言,內置S=0.375螺鏇葉片轉子換熱管的綜閤評價因子大于內置S=0螺鏇葉片轉子換熱管的綜閤評價因子,內置S=0.25螺鏇葉片轉子換熱管綜閤評價因子最小。綜上可得,較大直徑的開孔能提高轉子的綜閤性能,但是較小直徑的開孔反而會減弱轉子的彊化傳熱綜閤性能。
이60%감유수용액위관정개질,대내치불동공경개공라선협편전자환열관과도구전열화조력특성진행료실험연구。대광관성능진행료실험험증,이보증실험결과적가고성。동시,대비분석료전자개공공경대기강화전열성능적영향,실험결과표명:내치S=0.375라선협편전자환열관노새이수비내치S=0이급S=0.25라선협편전자환열관적노새이수분별고출9.5%화21%좌우,조력계수고출9%좌우。이대우종합성능이언,내치S=0.375라선협편전자환열관적종합평개인자대우내치S=0라선협편전자환열관적종합평개인자,내치S=0.25라선협편전자환열관종합평개인자최소。종상가득,교대직경적개공능제고전자적종합성능,단시교소직경적개공반이회감약전자적강화전열종합성능。
Experiments were conducted to study the heat transfer and friction factor of the heat transfer tube inserted with rotors with different holes. A 60%glycerin solution was used as tube-side working fluid in the transition region. In order to ensure reliability of experimental results,plain tube validation experiments were also conducted. Meanwhile,the effects of hole on heat transfer enhancement of the rotors were investigated. The Nusselt number of the tube inserted with S=0.375 rotors increased by 9.5%and by 21%than the Nusselt number of the tube inserted with normal rotors and rotors with hole of 3mm diameter respectively. Its friction factor increased by about 9%than the friction factor of the tube inserted with S=0 rotors and S=0.25 rotors. The PEC value of the tube inserted with S=0.375 rotors was the best,while the PEC value of the tube inserted with S=0 rotors was better than the tube inserted with S=0.25 rotors. The diameter of the hole had different impacts on the performance of the rotors. Big hole had a good effect,but on the contrary small hole weakened heat transfer enhancement.