全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
化工学报  2013 

矩形自支撑缩放管换热器强化传热的结构优化

DOI: 10.3969/j.issn.0438-1157.2013.07.010, PP. 2376-2385

Keywords: 自支撑,缩放管,强化传热,场协同,结构优化

Full-Text   Cite this paper   Add to My Lib

Abstract:

在新型换热器——矩形自支撑缩放管换热器的基础上,通过FLUENT软件利用三维数值模拟的方法分别研究在缩放段长度比例保持不变的情况下,缩放节距及缩放肋高对换热器管程、壳程及整体综合传热性能的影响,并得出缩放管的优化尺寸。研究表明:对于换热器管程和壳程,缩放节距l越小,换热效果越好,阻力也越大,壳程在l=16.5mm时综合传热性能达到最佳,而管程则在l=9mm时综合传热性能最好;缩放肋高h越大,二者的换热效果越好,阻力也由于管子的粗糙程度增加而变大,此时综合传热性能管程在h=1.25mm时最好,壳程则在h=0.5mm时最好。引起这些变化的原因主要是由于随缩放节距与缩放肋高的增加,管程和壳程通道内的回流区不断增加,在回流区的增加造成阻力增加的同时,也改善了速度场与温度场的协同性,从而使二者的传热性能增强。最后将管程和壳程作为一个串联的整体进行综合考虑,得到整个换热器的综合传热性能在l=15mm,h=0.75mm时达到最佳,综合因子η=1.136~1.155(壳侧Re=27900~41900)。

References

[1]  Dong Qiwu (董其伍). Heat Exchanger (换热器)[M]. Beijing:Chemical Industry Press,2008:5-9
[2]  Zhang Guanmin (张冠敏). Research on heat transfer enhancement mechanism and heat transfer characteristic of compound corrugation plate heat exchanger[D]. Jinan:Shandong University,2006
[3]  Deng Xianhe (邓先和),He Zhaohong (何兆红),Zhou Liang (周亮). Rectangular tube bundle heat exchanger adopting swirl plate support and its intensified heat-conduction method[P]:CN,200710029118. 2009-06-10
[4]  Deng Xianhe (邓先和),He Zhaohong (何兆红),Li Ziwei (李自卫). Self-supporting rectangular zoom tube bundle heat exchanger and intensified heat transfer method thereof:CN,200910215974. 2012-02-01
[5]  Chen Ying (陈颖),Deng Xianhe (邓先和),Ding Xiaojiang (丁小江). Convection heat transfer of converging diverging tube(Ⅱ):Optimal geometry configuration[J]. Journal of Chemical Industry and Engineering (China)(化工学报),2004,55(11):1764-1767
[6]  Smith Eiamsa-ard,Pongjet Promvonge. Numerical study on heat transfer of turbulent channel flow over periodic grooves[J]. International Communications in Heat and Mass Transfer,2008,35:844-852
[7]  Rahimi M,Shabanian S R,Alsairafi A A. Experimental,CFD studies on heat transfer and friction factor characteristics of a tube equipped with modified twisted tape inserts[J]. Chemical Engineering Processing,2009,48(3):762-770
[8]  Ashis K Mazumder,Sujoy K Saha. Enhancement of thermohydraulic performance of turbulent flow in rectangular and square ribbed ducts with twisted-tape inserts[J]. Journal of Heat Transfer,2008,130:081702-1-081702-10
[9]  Wang Yangjun (王杨君),Deng Xianhe (邓先和),Hong Mengna (洪蒙纳),Li Zhiwu (李志武). Structural optimization of twisted leaves based on heat transfer enhancement for periodic free swirl flow in tube[J]. Journal of Chemical Industry and Engineering (China)(化工学报),2006,57(11):2554-2561
[10]  Shabanian S R,Rahimi M,Shahhosseini M,Alsairafi A A. CFD and experimental studies on heat transfer enhancement in an air cooler equipped with different tube inserts[J]. International Communications in Heat and Transfer,2011,38:383-390
[11]  Smith Eiamsa-ard,Pongjet Promvonge. Thermal characteristics in round tube fitted with serrated twisted tape[J]. Applied Thermal Engineering,2010,30:1673-1682
[12]  Khwanchit Wongcharee,Smith Eiamsa-ard. Heat transfer enhancement by twisted tapes with alternate-axes and triangular,rectangular and trapezoidal wings[J]. Chemical Engineering and Processing:Process Intensification,2011,50:211-219
[13]  Webb R L, Eckert E R G. Application of rough surfaces to heat exchanger design[J]. International Journal of Heat and Mass Transfer,1972,15:1647-1658
[14]  Incropera F P,Witt P D, Bergman T L, Lavine A S. Fundamentals of Heat and Mass Transfer[M]. New York:John-Wiley & Sons,2006:151-153
[15]  He Zhaohong (何兆红). Study on flow resistance and heat transfer in rectangle tube bundle heat exchanger. Guangzhou:South China University of Technology,2010
[16]  Guo Z Y,Li D Y,Wang B X. A novel concept for convective heat transfer enhancement[J]. International Journal of Heat and Mass Transfer,1998,41 (14):2221-2225
[17]  Tao W Q,Guo Z Y,Wang B X. Field synergy principle for enhancing convective heat transfer—its extension and numerical verifications[J]. International Journal of Heat and Mass Transfer,2002,45(18):3849-3856

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133