الفهرس 
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Abstract
In tne prc:sl.:;nt ~hes,:Ls, tb.t~ static and d.lnarnie .
havioUJ: of a th:cee flows input flow peturba,-tio:n as \w:i.l a.!.3 to both input flow an,l/r’” terlli~ned for all possible flow directions ~ Tne ar’i .;Y,8i8 lS C d out for the f02 low:1,ng conditions, the input pert,u.rbations aI’,’; 2DwL19 tlH’; three fluids are incompressible (liquids or -vapours at high pressures) 9 subject to no phase ::::a:-mge and f10v)ing Algol proced.ures a.I”€; presentedo In the first procedure (ITDSRT)~ which yields the initial steady state tempera,tll:re distri.1rutions as wc: J1. 3.;~ the steady state tem.p~J;,a.ture re::3J;Jons12’ of the !hree,”,fl.~ws heat: exchanger, an exact anal.yti’.:;al metnod based on the Lapl.ace transformation has been used to obtain the soh,. tion. In the second procedure (SUPR) \) a numerical method of solution based on the Ru.ng(;•~Kutta-Merson technique and on the supe:positionmethod has been usedo This was by no means needless because of the 1.ength and monotf)ny nf the calcl.l.lation involved in ITDSRT. ;1.,1 the tm:”E,c f10\”18 heat exchanger to both .:t1owar,dlnr br>pertu.:rbation8 j.s cletcrm i’rll. .. d tb.:r’ough use appro.f;riate iterative tt’,,;cnni’iUc.8 of solution” br>.. .An experimEmtal invcs’tiga’tion vnl:S cEu•ried out for case vmen th,;wall hea.t fl-.’!,:x: tial manner in the direction of the flow” The heat trans;,. fer coefficient was measu.:ced ar1d tht; corre,sponding Nusselt number vias c,’;\.lc~ul.ated and compared with its’ cam” when the wall ht::a,t flux is uniform in the Ae experimental. reBults sho\ved thDt tiv:; higher than the latter” The ratio was plotted