Investigation of Schmidt number dependence on lift off and blow off in laminar planar jets
According to the laminar flame theory, a flame is anchored when the axial gas velocity is approximately equal to the laminar flame speed at a position where the mixture is in stoichiometric proportions. This anchoring position can be found by analyzing two contours: the flame speed contour and the stoichiometric contour. The intersection of the two contours gives the lift off height if the Schmidt number, Sc is greater than 1. However, if Sc<1, the intersection point corresponds to the partial flame height. For Sc = 1, the two contours do not intersect and no lift off heights are predicted. By setting the height of the intersection point equal to the height of the stoichiometric contour, an expression for the blow off velocity is obtained for all Sc.
author list (cited authors)
Tillman, S. T., Annamalai, K., & Caton, J. A.