Thermal Conductivity and Thermal Diffusivity of Twenty-Nine Liquids:Alkenes,Cyclic (Alkanes,Alkenes,Alkadienes,Aromatics),and Deuterated Hydrocarbons

摘要

Experimental values of the thermal conductivity A and thermal diffusivity a of 29 pure substances are presented in the temperature range of -15 deg C to 65 deg C under atmospheric or saturation pressure.The materials measured were as follows:alkenes (1-pentene,1-hexene,1-heptene,1-octene,2,3-dimethyl-1-butene,2,3-dimethyl-2-butene),cycloalkenes (cyclopentene,cyclohexene),cycloalkanes (cyclopentane,cyclohexane,methylcyclopentane,cycloheptane,cyclooctane),aromatics and their relatives (benzene,ethylbenzene,o-,m-,and p-xylenes,propylbenzene,isopropylbenzene,hemimellitene,pseudocumene,mesitylene,1,3-cyclohexadiene,1,4-cyclohexadiene,bicyclo[2.2.1]hepta-2,5-diene [norbornadiene]),and deuterated hydrocarbons (benzene-d_6,cyclohexane-d_12,toluene-d_8).X Measurements were made with the transient hot-wire method in the manner previously presented,and the thermal diffusivity values were corrected by reference to the heat capacity of heptane as a reference material.Heat capacities (volumic,c_(prho);massic,c_p;molar,C_(m,p)) were complementally derived from the relationship c_(prho) = lambda/a,with values for the density and the molar mass.The uncertainty of the data is estimated to be 0.4% for the thermal conductivity (absolutely measured) and about 1.8% for the thermal diffusivity (with a coverage factor of k_p= 2;p = 95%),although that of A (not of a) is possibly inferior for a few substances containing slightly more impurities (i.e.,mainly other isomers).