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The results of previous theoretical and experimental studies on the relationship between the liquid-film thickness produced at exit from pressure-swirl and airblast atomizers are reviewed. An electrical conductance method is used to measure the liquid-film thickness in the final orifice of a specially designed simplex atomizer when discharging water into air at normal atmospheric pressure. The results of these measurements are compared with various theoretical equations for predicting liquid-film thickness in this type of nozzle. Excellent agreement between theory and experiment is demonstrated for two equations, one of which is derived in this paper. Aa Ap A0 CD dp Ds dQ mL SMD t X PL 6 AP Nomenclature =air core area, m2 = total inlet ports area, m2 = discharge orifice area, m2 = discharge coefficient = inlet port diameter, m = swirl chamber diameter, m = discharge orifice diameter, m = flow number, = m/(APpL)Q-5 , m2 = liquid flow rate, kg/s = Sauter mean diameter, m = liquid-film thickness, m =Aa/A0 = liquid viscosity, kg/ms = liquid density, kg/m3 = spray cone half -angle, deg = total pressure drop across nozzle, Pa
Suyari et al. (Sat,) studied this question.