The Effects of Additives on Fluid Friction 



REPLY TO THE DISCUSSION 



J. W. Hoyt and A. G. Fabula 



U. S. Naval Orclnance Test SiaLion 



Pasadena, California 



The authors would like to thank the several discussers for their comments 

 regarding this interesting new field in fluid dynamics.* It is to be hoped that 

 theoretical attacks on the mechanism of drag reduction through the use of high- 

 polymer solutions will soon give the firm foundation needed for further advances 

 in the application of the method. Perhaps the approaches of Prof. Eringen and 

 Mr. Tulin will provide the keys to this understanding. With regard to Dr. Schwa- 

 necke's questions, the only published data now available on the ejection of ad- 

 ditives over a body seems to be the Vogel and Patterson paper in this Sympo- 

 sium. Our experience with various molecular weight additives seems to indicate 

 that the higher the better, if the molecule is also fairly linear. 



TORQUE CELL 



DC MOTOR 



Fig. 1 - Large rotating-disk apparatus 



= See contribution by Eringen to the paper by Lumley. 



221-249 O - 66 - 62 961 



