A note on vaporization of liquid drops in a pulsating air flow
Abstract
An experimental investigation was carried out on the vaporization of single ethylalcohol drops suspended in a hot pulsating flow of air for Strouhal numbers up to about 0.7. The Nusselt number of the vaporizing drop was calculated, and the results for the unsteady flow were compared with those relating to a flow having a uniform velocity equal to the mean velocity. In the range of Strouhal numbers investigated, the pulsations caused a diminution of the vaporization rate, as for a quasisteady state. It is shown that one should consider using the product of the Strouhal number and the relative amplitude of fluctuating velocity as the dimensionless parameter which governs the problem instead of the Strouhal number alone.
 Publication:

Israel Journal of Technology
 Pub Date:
 1974
 Bibcode:
 1974IsJT...12..305A
 Keywords:

 Air Flow;
 Drops (Liquids);
 Evaporation Rate;
 Oscillating Flow;
 Convective Heat Transfer;
 Dimensionless Numbers;
 Drop Size;
 Ethyl Alcohol;
 Fuel Sprays;
 Mass Transfer;
 Nusselt Number;
 Photographic Recording;
 Stagnation Point;
 Strouhal Number;
 Thermal Conductivity;
 Uniform Flow;
 Unsteady Flow;
 Fluid Mechanics and Heat Transfer