F • CONVECTIVE HEAT TRANSFER IN GASES 



ferred into the wall from the layer, thereby increasing the wall temper- 

 ature. The fall and rise in temperature of a flat plate increasing its speed 

 from subsonic to supersonic speed while remaining at 40,000 ft altitude 

 is shown in Fig. F,20g. It appears that the solar heat is balanced at about 

 Mach number 1.5 for 50 per cent of direct solar radiation. The skin tem- 



1000 



900 



o 

 CD" 







800 



700 



600 



500 



10 20 30 40 50 60 



Time, seconds after take-off 



70 



Fig. F,20i. Correlation of theory with skin-temperature data from a V-2 

 rocket. Boundary layer tripped. Data of Fischer and Norris. 



perature then is about 120°F which would begin to produce discomfort 

 for the pilot if one were present. 



Correlation of theory and experiment. Considerable skin-temperature 

 data have been recorded during the flight of supersonic missiles. Of par- 

 ticular interest are the data reported by Fischer and Norris [64,65], meas- 

 ured at several points on the nose of a V-2 (German A-4) rocket during 

 ascent at White Sands, New Mexico, on October 9, 1947. Fig. F,20h and 

 F,20i show the experimental temperature variation with time for stations 



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