The densities of endothermic hydrocarbon fuels were
measured covering the temperature from (235.0 to 353.0) K at
pressures of (0.68,1.47, 3.06 and 4.09) MPa. The densitometer
is based on the attenuation theory of gamma ray with a count
rate mode. When the intensity of a gamma beam passes through
fuels, it decreases exponentially. According to Beer−Lambert’s
law, densities of fuel were calculated through the different
count rates and densities of referenced fluid. Pure hexane and a
binary mixture of n-heptane and n-octane were adopted
respectively to validate the reliability and accuracy of the
densitometer. Results showed that the average absolute
deviation(AAD) was lower than 0.32 % and the maximum
absolute deviation(MAD) was within 0.67 %.
Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .