Talk:Péclet number

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[edit] Relative magnitude of the Peclet number

Is it worth saying that values of the Peclet number are typically very large in most engineering applications? 128.12.20.32 21:49, 21 February 2006 (UTC)

Absolutely. I think that is a useful piece of information and I have added it to the article. Thanks.--Commander Keane 22:04, 21 February 2006 (UTC)

[edit] Better definition?

A Peclet number is typically a ratio of the time scale for diffusive flux of some quantity to the time scale for convective flux of that quantity. The quantity doesn't have to be heat, as is described here. For example, a Peclet number can easily be defined for problems in mass transport, where the quantity of interest is the concentration of some chemical species. Thoughts?

Yes, this is something of interest for igneous petrologists - how does the equation differ? And is it also referred to as a Peclet number or is the name modified?

I have seen the Peclet number written for mass transport as the product of the Schmidt and Reynolds number. Thus it could be written:- Pe = lv/D where D is some appropriate diffusion coefficient (or mass diffusivity). Its use is common in literature but don't have a specific citation for it.

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