PREFACE TO VOLUME V 



Bailey, Jr., the Director of the Press, and Mr. R. S. Snedeker, who has 

 supervised the project at the Press, have been of great help. The figures 

 were prepared by Mr. Zane Anderson. Special mention is also due Mrs. 

 E. W. Wetterau of this office who has handled the bulk of the detailed 

 editorial work for the program. 



Coleman duP. Donaldson 

 General Editor 



PREFACE TO VOLUME V 



This volume deals with the interrelated problems of turbulent flow and 

 heat transfer. It begins with an article on transition from laminar to 

 turbulent flow. This is followed by a discussion of the problem of shear 

 flow from the experimental and semi-empirical points of view and of the 

 statistical theory of turbulence from a deductive point of view. Future 

 developments in our knowledge should result in the merging of these two 

 approaches into a comprehensive and unified treatment. 



The three modes of heat transfer — conduction, convection, and radi- 

 ation — are presented in the remaining part of this volume. These articles 

 are especially oriented toward high speed flows with high temperature 

 differences. Free convection due to gravitational forces is considered in 

 this portion of the volume only in connection with boiling heat transfer. 

 In the sections on the physical basis of radiation and on the method of 

 engineering calculations in radiant heat exchange, it is an interesting 

 reflection on the current status of our knowledge in this important field 

 that these two phases of the problem are presented from somewhat 

 different points of view. 



As originally planned, this volume was to be the second part of a 

 larger volume comprising the present Volumes IV and V, under the joint 

 editorship of Lester Lees and myself. The desirability of separating the 

 material into two volumes soon became clear, on account of both the size 

 of the articles and the nature of the material involved. Professor Lees had 

 the major share of the editorial work at the early stages. Unfortunately, 

 he was unable to continue with his editorship after he moved from 

 Princeton University to the California Institute of Technology, with the 

 consequent increase of pressure from his duties. I believe I may speak for 

 Professor Lees as well as for myself as I express appreciation for the fine 

 cooperation of all the authors, the General Editor, and the Princeton 

 University Press. 



C. C. Lin 

 Volume Editor 



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