ESTIMATION OF THE SHARMA CONSTANT AND THERMOACOUSTIC PROPERTIES OF VEGETABLE-OILS

The density and volume of four Indian edible vegetable oils, sunflower , rice bran, groundnut and coconut, and one Indian nonedible oil, cast or oil, have been experimentally determined. The values obtained were used to estimate the volume expansivity alpha, hence the thermoacousti c parameters, such as the Sharma constant S-0, the isochoric temperatu re coefficient of internal pressure [dlnPi/dlnT](V), the isochoric tem perature coefficient of volume expansion [dlna/dlnT]V-,V- reduced volu me ($) over tilde V, reduced compressibility ($) over tilde beta and t he Huggins parameter F. The results obtained show that the Sharma cons tant S-0 has the same characteristic value of 1.11 +/- 0.01 for the fi ve oils, thus establishing the constancy of the Sharma parameter. All the other parameters are of the expected order of magnitude; however, in all cases there is a uniform deviation at 293 degrees K, which can be attributed to the behavior of density and volume at this temperatur e.