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The effect of sIze and velocity on the burning

conditions of fuel droplets By H Koumouhol - G Stephanopoulos

Silmmary

The wide nso of ~ pray injPot Uun for the burning or a li quid fuel in a combustion ch a mber IHS lead to the ntluU fol an oxLcus ive analys is of th n processes which govern lhe cumbustion of liquid aerosols

Thi Jllp cr p rescnt~ lheorutical (l nd experimenlal aspects involvuci i n the burnin of a sin gll fu el drople t I ti s nl5sumshymiddotd tha t Ihe singhgt dropl cL li llllling i ts(tlf r l rn ai ns a probl~m or fund amen tal irliporlanclJ in combus tion re~ middotmiddotarc h In Ihtl pItsen t tl ll ll lys is uf 1 s teady Slate llderogc neo lls combushys lion as encounlIlHl in lh t burni ng of a liqu id drop let f a spherically 6ym Hlol ric model is asSUIIWC[ wi th a fin ito cold bound rt ry bulll a nam l holner the latter corre6pondiug to the llquid - val lu r ill tGImiddotrace

lo 56t up the matlw lfHllic il l model of thu ph enomenon in cunsidero Li on a numuur of s imple assullli-tions is ne(essary

Th us II wns- IlSsumcd th al 51(o1(ly s tal l cO mbu g l ion OCC UJS undt1 r i s o bari ~ cotlditiuns that the hea t ril ltlused as a result of th ) the mical n-lc lion is removNJ by conduction and Jnass tranl fet th ~lt quantili Oi s uch as thermal conductivi ty dCrlAi ty etc 3 r(gt considei d to be illdepend ll nt of temperashyture tl lld cDrnpositioH and so on

In case of ze ro 8cti vHtion en ergy a (lame toni r)[ inHnit lsshysimal thickness resul ts a t which the weight fr ac tions of both ruel and ox icii zer become zero TIll wllole nli lQ is there shyby middotjlJ para tad intI two lfgions rn th i fi rS the cllerll or dlttmiddot mica l readion ie Zlro In tlto scond the reaction goes to comple tion r h ll an alysis then knds t o ll fysk lO v f i1 rst ord el dil1( ren ti a l o qll a tion~ from hich x plid t ~olu lio ns can bt t ~kc n Amung ot hc-Js lhe fu el muss low rfllL t he ( ombution s urface IflT1 p cra t rm~ and lhlgt fuel frac tion a t Uk liqu id s urface art Cl vtainod

TtL l Nov iclmiddotS lo kes equ ation tor viscous axisy mruetrico fl ow was solvtJ d by u6ing a digital computer Thwl he pressure and vorti city pruOls around the burnin~ droshyplet along with the drng coeffici en t ( 01 various Reynolds num be rgt using the air velocity as a parameter werO ob fa inlHl

Exporun onlal m eaSUrf JJl ents have lead to values or burning cUllStan Ls for va riou air-now velodties and in itial d op lc t ~ i l)s Ultimat ely a condition is Icached whon du e Lo d(t shyc(0Rsed temp era ture the weight rraction or rt lle lanls preshysen t in the Nnc tion lo ne can no longl1 r be t unsumf)u Then unburued or paJti ally burn ed ma k middotl ilJ pas~e~ lll ro ugh Ut e lone FU I lhnr d O( I~asc in torllpcra lUlu li3su lls in a 1Illumiddot clion of the reaction rale and SV on unlillinalJy the 111 11 11 van ishes