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7.4 The reformed diagram

The method based on the liquid metal properties is with disagreement with
commonly agreed on in fluid mechanics [#!fluid:pao!#, pp. 235-299].
It is commonly agreed that is a function of Reynolds number and the
geometry of the runner design.
The author poro:pQtwo suggested adopting
an approach where the is calculated by utilizing
data of flow resistance of various parts (segments) of the runner.
The available data in the literature demonstrates that a typical value of
can change as much as 100% or more just by changing the gate area
(like valve opening).
Thus, the assumption of a constant , which is used
in ``common'' calculations^{11}, is not valid.
Here a systematic derivation of the diagram is given.
The approach adapted in this book is that everything (if possible) should be
presented in dimensionless form.

**Subsections**

*Genick Bar-Meir ||| www.potto.org
*

copyright Dec , 2006

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