Abstract
Concerning Newtonian liquid flow in a circular pipe, the critical position where the first disturbance occurs and the process of transition from laminar to turbulent flow are studied with an electro-chemical technique.
The critical position predicted from theoretical considerations is 0.577rw (rw is radius of pipe) from the axis of pipe, and this is confirmed by experiments.
The transitional process is described by probability density distribution of velocity fluctuations, intermittency factor, peak numbers, maximum range of velocity fluctuations and intensity of velocity fluctuations. The relation of these factors to each other is discussed.
