F,5 • NUMERICAL RESULTS 



(1) specific heat of air as an ideal gas as given in NBS-NACA Table 2.10, 



(2) a viscosity variation made up of Hirschfelder's formula (treating air 

 as a single-component substance) below 216°R., and (3) the thermal con- 

 ductivity of air in NBS-NACA Table 2.42. Above 400°R, the Prandtl 



1000 



3 

 h- 

 CQ 



>^ 



O 



4— 



c 



LU 



500 



1000 2000 3000 4000 



Temperature, °R 



Fig. F,5b. Enthalpy of dry air in the ideal-gas state as a function of temperature.. 



1500 



X 



O 

 w 



'o 



Q. 



1000 



o 



"in 

 O 

 U 



'> 



o 



_Q 

 < 



500 



Fig. F,5c. 



100 



Temperature, °K 



Absolute viscosity of dry air as a function of temperature. 



200 



numbers were obtained from NBS-NACA Table 2,44, which is in accord 

 with the recent measurements of Keyes [4]. Although the uncertainty in 

 the Prandtl number is less than 2 per cent at temperatures below about 

 1200°R and greater at higher temperatures, the curve in Fig. F,5a was 

 taken as definitive for calculation purposes. 



( 351 > 



