TM No. 377 



(° Fluid density 



p u 'w ' Reynolds stress 



a Standard deviation 



o^ Variance 



2 



a u Variance associated with horizontal velocity component u(t) 



a w ^ Variance associated with vertical velocity component w(t) 



t Time lag 



Azimuthal angle lying in the horizontal XY plane 



0j4 Number of lines of magnetic flux per unit area. 



|j u (f ) Auto-spectrum function of u 



U (T) Auto -co variance function of u(t) 



^uw^^ Cross -variance or covariance functions 



JL(f ) Auto -spectrum function of w 



P ¥U (T) Cross -A r ariance or covariance functions 



j3|o Spectrum function of free surface oscillation y\ 



^ Driving frequency 



fi'g Angular velocity 



co(t) Angular velocity of impeller 



xx 



