Heats of vaporization of eight gasolines

Abstract

Measurements of the heats of vaporization at 40° C of 8 gasolines were made with an estimated accuracy of about 3 percent. The fuels investigated included 1 natural gasoline, 2 aviation gasolines, 1 straight run naphtha, 3 cracked naph-thas, and 1 "safety fuel." The last named fuel is a hydrogenation product, which is apparently richer in h ydrocarbons of the aromatic series than the other fuels. The results on all the fuels, except the safety fuel, can be represented within the accuracy of the measurements by a linear function of either specific gravity or average volatility. The application of the res ults to the problem of ice formation in the carburetors of aviation engines due to cooling produced by cvaporation of the fuel is briefly discussed. It is concluded that large differences in the rates of formation of ice with different fu els cannot be attributed to differences in the Ileats of vaporization, but must be largely due to difJerences in the completeness of vaporization of the fuels in the carburetor, resulting fr om differe nces in volatility of th e fuels. CO N TE N T S Page I. Introduction_ _ _ ____ ______ ___ _ _ _ __ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ __ _ _ _ _ _ _ _ _ __ 227 II. Apparatus and method_ _ __ ___ _ _ _ _ _ _ _ __ _ _ _____ ___ _ __ _ _ ___ _ _ _ _ __ 227 III. Measurements on fu els ____ __________ _________ .. _ __ _ _ _ _ _ __ _ _ _ _ __ 231 1. Materials investigated __ ______ _____ .. __ _ _ _ _ _ _ _ _ __ __ _ _ _ _ __ 231 2. Results of measurements _ _ ______ __ __ __ __ __ _ __ _ _ _ _ _ __ __ _ _ 232