heat transfer analysis of integral-fin tubes

Engineering and Technology 2015; 2(2): 23-34 Published online March 30, 2015 (http://!aascit!or"/#ournal/et) Keywords $eat %rans&er,'nte"ral - (in %ube,)*peri+ental ,tud- .ecei/ed: March 0, 2015 .e/ised: March 21, 20151ccepted: March 22, 2015 Heat Transfer Analysis ofIntegral-Fin Tubes Laith Jaafer Habeeb1, Abdulhassan A. Karamallah1,Ayad Mezher Rahmah2 1Mech! )n"! 2ept!, 3ni/ersit- o& %echnolo"-, 4a"hdad-'ra5 2,tate 6o+pan- &or 7il Pro#ects (,!6!7!P), Ministr- o& 7il, 4a"hdad-'ra5 Email address laithhabeeb1894:"+ail!co+ (;! u+aretal!D10Estudiedtheheattrans&erau"+entation durin" condensation o& ater and .-134a /apor on hori?ontal inte"ral-&intubes!'n%hise*peri+entalin/esti"ationas per&or+edontodi&&erente*peri+entalset-ups&orater and .-134a! %arradD19Epresentedaco+puteri?ed+odel&orthe ther+al-h-draulicdesi"no&asin"leshellFsin"lepasslo &innedtubebundleheate*chan"eusin"thestepb-step techni5ue (,,%)! (ernJnde?-,eara et al! D1BE in/esti"ated e*peri+entall- the condensation o& a++onia on s+ooth and inte"ral-&in (32 &ins per inch (&pi)) titaniu+ tubes o& 18!05++ outer dia+eter! 'nthisin/esti"ation,thee&&ecto&aninte"rallo&inned tube in cross &lo air cooled in a hori?ontal sin"le tube +ulti passesontheheattrans&erbeha/iorillbeanal-?ed e*peri+entall- and theoreticall-! 1lso, the e&&ect o& chan"in" air /elocit- and inlet ater te+perature are in/esti"ated! %his orCpresentsasu""estiontode/elope+piricalcorrelations &ortheairsideheattrans&ercoe&&iciento&aninte"rallo &inned tube, represented b- the e+pirical correlations &or the air side Ausselt nu+ber! 2. E!erimental "or# 2.1. T$e Test %ig (i"ures(1-a,b)shoaphotoandsche+aticdia"ra+o& thee*peri+entaltestri"!%hetestri"isdesi"nedand +anu&actured to &ul&il the re5uire+ents o& the test s-ste+ &or as+oothandinte"rallo&innedtube!%hee*peri+ental apparatus consist basicall- o&: %he duct and test section! %he air&lo rates suppl- section! %he ater &lo rates suppl- section! %he +easurin" de/ices! (a) )n"ineerin" and %echnolo"- 2015; 2(2): 23-34 25 (b) Figure (1). Experimental test rig: (a) Photo, (b) Schematic diagram. 2.2. Air Circulation &ystem %heairassuppliedtothetestsectionb-centri&u"al bloero&(390G)!'tassuppliedairatthreele/elso& /elocit- (1, 2, 3) +/sec at the test section, controlled b- usin" +ulticon&i"urationso&circularcross-section"ate +anu&actured&orthispurpose!%he"atecontrolsair+ass &loratesandair/elocitiesatthetestsection!%here5uired /elocities ere obtained b- replacin" the con&i"uration o& the "atebeteenthe&ull-openedithoutan-"ate(+a*i+u+ &lo rate) and 45 partiall- opened (+ini+u+ &lo rate)! %he bloeroutletisconnecteddirectl-toa"al/ani?edsteelair di&&userb-boltsa&terinsertin"therubbersealandsilicon, and the other side o& di&&user is connected ith the to la-ers o& the +esh at the &ace o& the di&&user beteen the +ain duct anddi&&user!%he+eshisdesi"nedand+anu&acturedto ensureda+pin"o&an-disturbanceinairstrea+be&ore enterin" the test section and to obtain a re"ular &lo! %he air bloer is &i*ed to the iron &oundation b- bolts ith thicC rubber beteen the bloer and &oundation &or da+pin" the /ibration hen the bloer operates! %heductis+anu&actured&ro+a"al/ani?edsteelsheetat rectan"ularcrosssectionithidthandhei"ht(251 ++K499++)andlen"th2+iththetestsectionpart!%he duct is connected ith the bloer b- a di&&user and the other sideendedithanotherdi&&useropenedtotheat+osphere a&terinserttherubbersealandsiliconattheed"es!%he suitabletestductlen"this390++&i*edat2000++&ro+ thebe"innin"o&inletdi&&user,thetesttubepassedthrou"h theducthori?ontall-at21B5++&ro+thebe"innin" o&inlet di&&user, as shon &i"ure (2)! Figure (2). Schematic illustration o duct. 20;aith i+,Moo-eon;eeandVon"chan >i+,T+irSide1eatTranser&oeicientsoDiscretePlate #inned5Tube 1eat Exchangers "ith !arge #in PitchU, 1pplied %her+al )n"ineerin", 30, pp!194F1B0, 2010! D14E$!$onda,,!Ao?uandV!%aCeda,T+Theoretical;odelo #ilm&ondensationina9undleo1ori8ontal!o"#inned Tubes T, %ransactions o& the 1,M), eithG!4ed&ord,T#luid ;echanicsU, Ainth edition, McMra-$ill 6o!, 1885!