Measurement of Skin Friction Using Surface Tubes: A Simple Method which can be used for Different Fluids and Conditions

The report covers an extension of the surface tube technique devised by T. E. Stanton to measure the intensity of skin friction. A simple surface tube is described and a method of varying the surface tube calibration curves to cover other fluids and temperatures is developed. An empirical equation is obtained permitting values of the intensity of skin friction to be determined from surface tube static tapping readings and the width of the opening of the surface tube.