A review is made of some of the experimental data and recent analyses applicable to predicting void fractions with two-phase, steam-water flow through tubes and channels. An empirical equation is presented that closely approximates experimentally measured void fractions in terms of the fluid quality and the ratio of the density of the fluid phases. Correlation of the data is achieved over a range of fluid pressures from 1 to over 135 atmospheres and fluid qualities from 0 to 1.0.

Rotation of the iced airfoil to angles of attack other than that at which icing occurred caused sufficiently large changes in the pitching-moment coefficient that, in flight, rapid corrections in trim might be required in order to avoid a hazardous situation.

The rate and area of cloud droplet impingement on several two-dimensional swept and unswept airfoils were obtained experimentally in the NACA Lewis icing tunnel with a dye-tracer technique. Airfoil thickness ratios of 6 to 16 percent, angles of attack from 0 to 12 degrees, and chord sizes from 13 to 96 inches were included in the study. The data were obtained at 152 knots and are extended to other conditions by dimensionless impingement parameters.