【正文】 間增多，從而使傳熱效果得以增強(qiáng)，同樣由于流體流動(dòng)距離增多，流動(dòng)阻力也隨之增大。 總 結(jié)本文研究了光滑波紋翅片管翅式換熱器的換熱與阻力特性，同時(shí)給出了在一定范圍內(nèi)對(duì)應(yīng)的努塞爾數(shù)和摩擦因子與雷諾數(shù)的實(shí)驗(yàn)關(guān)聯(lián)式；接著對(duì)光滑波紋翅片管翅式換熱器建立了數(shù)學(xué)模型，對(duì)換熱器內(nèi)空氣側(cè)的流動(dòng)和換熱進(jìn)行數(shù)值模擬，并與實(shí)驗(yàn)結(jié)果進(jìn)行了對(duì)比；最后應(yīng)用數(shù)值計(jì)算的方法考察了波紋形式、管排、翅片間距、波峰到波谷投射長度和波峰到波谷高度對(duì)流動(dòng)換熱性能的影響。所得結(jié)論如下：(1) 波紋翅片管翅式換熱器換熱性能隨著迎風(fēng)速度的增大而增大，換熱器的阻力損失同樣隨著迎風(fēng)速度的增大而增加，在實(shí)驗(yàn)范圍內(nèi)給出了摩擦因子與努塞爾數(shù)與雷諾數(shù)的實(shí)驗(yàn)關(guān)聯(lián)式, 為相關(guān)的工業(yè)應(yīng)用提供理論根據(jù)。(2) 波紋翅片管翅式換熱器流動(dòng)換熱性能計(jì)算結(jié)果與試驗(yàn)值相差很小，%，%，可以認(rèn)為光滑波紋翅片計(jì)算模型是可靠的。(3) 波紋翅片的j/f顯然大于人之形波紋翅片的j/f，光滑波紋翅片的換熱性能盡管稍微減小，但是卻可以較大程度減小壓降，表明了光滑波紋翅片是一種性能優(yōu)異的波紋翅片形式。(4) 當(dāng)管排數(shù)大于4排以后，波紋翅片的換熱與阻力性能幾乎不受管排數(shù)的影響。(5) 數(shù)值計(jì)算結(jié)果表明，翅片間距和波峰到波谷投射長度越小，空氣側(cè)換熱越強(qiáng)，同時(shí)空氣側(cè)的阻力越大；波峰到波谷高度越大，空氣側(cè)換熱越強(qiáng)，同時(shí)空氣側(cè)的阻力越大。 參 考 文 獻(xiàn)[1] 李祥華，宋光強(qiáng)．幾種新型換熱器的特點(diǎn)及使用狀況對(duì)比[J]．化肥工業(yè)．2001， 9(1)；7880．[2] Rich D G. The effect of fin spacing on the heat transfer and friction performance of miltirow smooth plate finandtube heat exchangers[J].ASHRAE Transaction. :137145.[3] Saboya F E M, Sparrow E M. Local and average transfer coefficients for onerow plate fin and tube heat exchanger configurations [J]. Journal of Heat Transfer 1974,96:265272.[4] McQuiston F C. Heat mass and momentum transfer data for five platcfin tube transfer surfaces [J].ASHRAE Transaction,1978,84:266293.[5] Xu Z G. A numerical and experimental study of turbulent flow through the evaporator coil in an airconditioning unit [J].International Journal of Refrigeration, 1996,19(6):369381.[6] Balaji C, Vkateshan S P. Combined conduction, convcction and radiation in a slot [J].International Journal of Heat and Fluid Flow, 1995,16( 2): 139144.[7] Rammohan Rao V, Vkatcshan S P. Experimental study of free convcction and radiation in horizontal fin arrays [J]. International Journal of Heat and Mass Transfer. (4):779789.[8] Abu Madi M, Johns R A, Hcikal M R. Performance characteristics corrckUion for round tube and plate finned heat cxchangcrs [J].International Journal of Refrigeration, 1998, 21(7):507517.[9] Meyer C J, Kroger D G. Plenum chambcr flow losses in forced draught aircooled heat cxchangcrs [J].Applied Thermal Engineering, (910):875893.[10] Atkinson K N, Drakulic R, Moikal M R, ct al. Twoand threedimensional numerical models of flow and heat transfer over louvcrccl fin arrays in pact heat exchangers [J].International Journal of Heat and Mass Transfer, 1998,(24):40634080.[11] Wang J, Hirs G G, Rollmann P. The performance of a new gas to gas heat exchanger with strip fin [J].Energy Conversion and Management. ( 1516):17431751.[12] RomcroMdez R, Sen M, Yang K T, ct al. Effect of fin spacing convcction in a plate fin and tube heat cxchanger[J].International Journal of Heat and Mass Transfer,2000,43( 1):3951.[13] Meyer C J, Kroger D G. Aircooled heat exchanger inlet flow losses [J].Applied Thermal Engineering,2001,21(7):771786.[14] Kcupiczka R. Rotlcegel A, Walczyk H, ct al. An experimental study of convectivc heat transfer from extruded type helical finned tubes [J].Chemical Engineering and Proccssing,2003,42( ] ):2938.[15] Kim Y, Kim Y. Heat transfer characteristics of flat plate finncdtubc heat exchangers with large fin pitchf [J].International Journal of Refrigeration 2005,28(6):851858.[16] Sahin H M, Dal A R, Baysal E. 3D Numerical study on the correlation between variable inclined ftn angles and thermal behavior in plate fintube heat cxchangerfJ]. Applied Thermal Engineering,(1112):18061816.[17] Naphon P. Effcct of wavy plate geometry configurations on the temperature and flow clistributions[J],International Communications in Meat and Mass Transfcr,2009,36(9):942946.[18] Choi J M, Kim Y, Lcc M, ct al. Air side heat transfer cocfiicits of discrete plate finncdtubc heat cxchangcrs with large fin pitch [J].Applied Thermal I:,30(23): 174180.[19] BoiTajoPclacz R, OrtegaCasanova J. CcjudoLopez J M. A threedimensional numerical study and parison between the air side model and the air/watcr side model of a plain fmandtube heat cxchangcr [J].Applied Thermal ,30:16081615.[20] Aris M S, McGIen R. Owen L. ct al. An experimental investigation into the deployment of wing and shape memory alloy vortex generators in a forced air convcction heat pipe fin stack[J].Applied Thermal Engineering,2011,31(1415):22302240.[21] Aslam Bhutta M M, Hayat N, Bashir M H, ct al. CFD applications in various heat exchangers design:A review [J].Applied Thermal ,32:1 12.[22] 王先超,水黎明,[J].河 南機(jī)電高等?？茖W(xué)校學(xué)報(bào),2010,18(2):610[23] 李媛,[M].石油機(jī) 械,2006,34(7):1014[24] 李媛, 凌祥,鋁板翅式換熱器翅片表面性能的實(shí)驗(yàn)研究[M].石油機(jī)械,2005, 33 ( 10):14[25] 王維斌,傅憲輝,吳茂剛, [M]機(jī)械設(shè)計(jì)與制造,2010,12:198200[26] 黃小輝,畢小平,[J]. 裝甲兵工程學(xué)院學(xué)報(bào),2008,22(5):2427[27] 陶文銓．?dāng)?shù)值傳熱學(xué)[M]．西安：西安交通大學(xué)出版社：2001．1518． 致 謝 另起一頁 從論文開題、數(shù)經(jīng)修改，到最終的脫稿，時(shí)光不知不覺慢慢流逝。終于到了畢業(yè)答辯，請(qǐng)各位教授、專家審核評(píng)定的日子。靜下心來，回首這段時(shí)間的點(diǎn)點(diǎn)滴滴，心中頓時(shí)無限感慨。論文工作的開展離不開導(dǎo)師、同學(xué)及其他老師的關(guān)懷和指導(dǎo)。在此，特別向他們表示衷心的感謝和敬意。 首先，導(dǎo)師唐玲虹嚴(yán)謹(jǐn)?shù)闹螌W(xué)態(tài)度、開闊的學(xué)術(shù)思維、淵博的科學(xué)知識(shí)、忘我的工作熱情、謙虛的做人品質(zhì)和高尚的育人師德，無論在學(xué)術(shù)還是生活上都給我無盡的啟迪，使我人生受益。 感謝班主任和專業(yè)相關(guān)的老師，為本論文工作的順利開展奠定了基礎(chǔ)。在此，向在開題過程中指導(dǎo)的各位老師表達(dá)由衷的感謝和敬意！ 感謝同門賈鵬飛，李建華，夏志鵬等在本論文完成期間給予的幫助，我向他們請(qǐng)教了很多的問題，并頗有收獲 。 感謝宿舍的哥們?cè)谏詈蛯W(xué)習(xí)上對(duì)我的幫助和支持，指導(dǎo)fluent的學(xué)習(xí)，很高興能和他們共同度過這學(xué)生最后階段。這段時(shí)光將珍藏于我的記憶，便縱有千種風(fēng)情，更與何人說！ 感謝我的父母及家中長輩給予我的支持與鼓勵(lì)，家長的期望是我我順利完成學(xué)業(yè)的最大動(dòng)力。 最后，衷心感謝在百忙之中評(píng)審本論文和參與答辯的各位專家、教授！ 格式 33