In the present study field samples of fuel ethanol ("E85") and gasoline ("E10") were tested for vapour pressure, ethanol content, and hydrocarbon composition.
The paper compares the measured upper temperature limits of flammability with the ambient temperatures of the field sampling locations, documents the relationship between vapour space flammability and vapour pressure, and discusses the requirements for achieving gasoline-like flammability performance at high ethanol levels.
As discussed by Zabetakis , the lower temperature limit of flammability can be calculated from the lower concentration limit of flammability and the vapour pressure curve of the flammable liquid in question.
Information on the vapour pressure (uv) or the relative humidity (uv/uvo) imposed by the CaS[O.
Blount & Dickson (1973) postulate a value of vapour pressure of 124 torr (16.
v]: vapour pressure imposed by the solution at atmospheric pressure
The obtained values of m and n for the test fluids are listed in Table 2 with the percent average absolute deviation, AAD, between predicted and reference vapour pressure, saturated liquid and vapour volume data.
This function improves remarkably the description of the vapour pressure for the set of the test fluids in comparison with the original SRK equation, from the triple point to the critical point.
Indeed, when only vapour pressure data are used in the regression procedure to determine M, N and L, Equation (9) gives a positive [alpha]([T.
The vapour pressure is attained by substituting the value of [L.
V] available the evaporation path is calculated in a stepwise manner by reducing the water weight by a constant value, [DELTA]W, an appropriate approach, since the vapour pressure of water is constant during the processes analyzed.
The advantage of using constant change of the water weight is that, with the invariant vapour pressure of water, the diagram of any property versus water weight also represents the variation in the property versus time; albeit on an arbitrary, but constant, scale.