A. S. Iberall 



Rg = dimensionless vector velocity, time averaged 



Rq = the z component of the time -averaged velocity (the only 



component in one -dimensional channel flow), dimensionless 



R^^ = the magnitude of the time-averaged velocity in the center 

 : - .-, of the channel (dimensionless, and thus the Reynolds num- 



ber of the flow field, based on half -plate separation and 

 maximum velocity) 



^oo + ^0 ~ ^^^ time-averaged dimensionless pressure 



^oo ~ 8^ ~ ^^^ form for one dimensional flow in a long channel 



P^Q = the level of mean pressure in the field 



g = the constant dimensionless pressure gradient in the field 



[= -(dPydz)] 



^oo "*■ ^0 ~ ^^® time-averaged dimensionless temperature 



3"^^ = the level of temperature (assumed for the source, as an 

 infinite reservoir, and for the long channel walls, as so 

 thermostatted) 



Jq = mean temperature deviations in the channel (assumed 

 negligible) 



(p(x) = the form of the time-averaged z velocity in channel flow, 

 expressed as a deviation from its value in the center of 

 the channel (i.e., R^ = ^^^{1 - (p )) 



R = dimensionless vector velocity, instantaneous fluctuating 

 component 



u , V , w = dimensionless fluctuating velocity components 



wT + ay + 5 z = the dimensionless propagation phase for a fluctuation 

 indexed by &j as a harmonic. 



a = the dimensionless y propagation constant 



§ = the dimensionless z propagation constant 



k = a2 + 52 



R^ = the dimensionless vector amplitude for a particular 

 fluctuation indexed by co. 



J.J = dimensionless fluctuating temperature 



736 



