The Surface Renewal and Penetration Model in Transient State
The transient models for some interphase transport processes have been developed based on the transient age distributions derived from the population balance. These models appear to represent physical reality more accurately than do the steady state models during the start-up period of the transport processes.
Chung, Benjamin T.F.; Fan, L. T.; and Hwang, C. L., "The Surface Renewal and Penetration Model in Transient State" (1971). Mechanical Engineering Faculty Research. 1041.