Thermal conductivity of gases. II. Thermal conductivity of carbon dioxide near critical point

~~'he t herma l co nductivity of CO 2 has been m.eas ured i n a coax ia l cylinder cell as a fu nctIO n of press ure over a range of t e mperatures from 3.66 to 75 .26° C .P ar Licular attention was gi ven to t he measurement s from 1 to 9 deg C a bove t he cri tical t emperature at press ures closely spaced to i ncl ude t he crit ical density.The t herma l co ndu ctivity of CO2(0) near t he cri tical point is ver y la rge co mpared to one a t mosphere \: a~Ll es a rou nd room t~mp e rat u re .At 1 deg C a bove t he cri tical p o int t he t herm a l cond uctl.vltyr ea?hes a maXUllum at t he critical d ensity.This maximum is greater than t~e m axun a at hIgher t emper at ures .At 75 .26°C, 44 deg C above t be cri tical temperat ure',h ttle unusual increase at t he critical densi ty was observed .'Th e ratc of heat t r anspor t by convection i n the cri tical region is also ve ry la rge.This problem was st ud wd carefull y in order t h at t he t emperatu re differences usee! we re res t ri cted to t he reg ion of la min ar fl o w, and t ha t appropri ate extrapolation p rocedures wcre u sed to find the ra te of heat t ra nsfer b y t her m al conduction alone .~~s o, at d ensit ies a nd temper at ures away f ro m t he cri tical reg ion , new t hermal con-ductlVl t ?va lu es 'ere obtained .