Experimental investigation of longitudinal mass transfer in the flow of polyoxyethylene solutions in a round pipe

A method is described for studying longitudinal mass transfer in the turbulent flow of polyoxyethylene solutions in a pipe using nuclear magnetic resonance effects.Notation L length of investigated section of tube - T time of flow over section L - modulation period - modulation frequency - v_av mean velocity - w longitudinal velocity pulsation - l marker length - M magnetization of a unit volume of the liquid - I intensity of NMR signal - q flow rate - c solution concentration Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 41, No. 3, pp. 402–406, September, 1981.