Garraio propietateak nahasketa hirutarretan

Abstract

Lan honetan, nahasketa hirutarretan egindako garraio-propietateen ikerketan lortu diren emaitzak aurkezten dira. Aztertu den nahasketa 1,2,3,4-tetrahidronaftalinak, isobutilbentzenoak eta n-dodekanoak osatzen dute. Nahasketa horretarako termodifusioko, difusio molekularreko eta Soret koefizienteak zehaztu dira 25ºC-ra. Termodifusioko koefizienteak zehazteko teknika termograbitazionala erabili da; Tutu Simetriko Irristagarriko teknika erabili da difusio molekularreko koefizienteak zehazteko; azkenik, termodifusioko eta difusio molekularreko koefizienteen neurketen konbinaziotik Soret koefizienteak zehaztu dira, osagaien fluxu-ekuazioaren arabera. Horrez gain, garraio koefizienteak zehazteko behar diren propietate termofisikoak neurtu dira: dentsitatea, errefrakzio-indizea, biskositate dinamikoa eta espantsio termikoko koefizientea.

In this work, we have analysed transport properties in ternary mixture. The analysed mixture is composed by 1,2,3,4-tetrahydronaphtalene, isobutylbenzene and n-dodecane. Thermodiffusion, molecular diffusion and Soret coefficients of this mixture have been measured at 25ºC. The thermodiffusion coefficients have been determined by the thermogravitational technique; the molecular diffusion coefficients have been determined by the Sliding Symmetric Tubes technique; finally, Soret coefficients have been determined from the combination of the measurements of thermodiffusion and molecular diffusion coefficients. In addition, the thermophysical properties needed for the determination of the transport coefficients have been measured: density, refractive index, dynamic viscosity and thermal expansion coefficient.