Abstract
A conceptual model has been constructed for the problem of determining a critical Reynolds number Rc from laminar to turbulent flows in a circular pipe and between parallel plates (Kanda [2-3]). For circular pipe flow, the minimum critical Reynolds number Rc(min) of approximately 2040 was obtained. In order to prove the validity of the model, another verification is required. Thus, for flow between parallel plates, results of previous investigations were studied, focusing on experimental data on Rc, the entrance length, and the transition length. Consequently, the model was confirmed and an experimental value of Rc(min) was found to exist in the neighborhood of 1300,based on the channel height and average velocity. For flow between parallel plates, the author obtained Rc(min) of approximately 1230 when using J0=101 grid points in the y-direction, and 910 when J0=51.
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