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Bulk & space-averaged velocity definition

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Old   September 26, 2005, 21:20
Default Bulk & space-averaged velocity definition
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I've read people using terms like bulk & space-averaged velocity in many papers. however, i can't seem to find the definition for them. for e.g., in some convective boundary conditions, the c term in du/dt + c*du/dx = 0 refers to space-averaged exit velocity.

hope someone can enlighten me.

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Old   September 26, 2005, 23:05
Default Re: Bulk & space-averaged velocity definition
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bulk: relative to different parts; space-averaged: as it means.

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Old   September 27, 2005, 03:02
Default Re: Bulk & space-averaged velocity definition
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thanks. but what i need is the formula, say in a channel or duct flow. how can i calculate its value.
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