Author Topic: Setting out inflow/outflow (Read 1010 times) Tweet Share

NE2000 · « **on:** November 01, 2009, 04:27:00 pm »

Again there are a number of different ways people do it and I was curious as to which way to do it. Additionally I wanted to know whether any of these ways are liable to be marked down for some mathematical technicality or other. The way I do it is:

$\frac{dx}{dt} = inflow rate - outflow rate$

$inflow rate = ...$

$outflow rate = ...$

And combine them

I've also seen:
$\frac{dx}{dt} = \frac{dx}{dt} |in - \frac{dx}{dt} |out$

$\frac{dx}{dt} = \frac{dx}{dV} |in \frac{dV}{dt} |in - \frac{dx}{dV} |out \frac{dV}{dt} |out$

And:
$\frac{dx}{dt} = (\frac{dx}{dt} )_{in} - (\frac{dx}{dt})_{out}$

So what do people use?

/0 · « **Reply #1 on:** November 01, 2009, 04:58:25 pm »

From Mao's bound notes:

$\frac{dQ}{dt} = \frac{dV_{in}}{dt}\cdot C_{in}-\frac{dV_{out}}{dt} \cdot \frac{Q}{V_0+\left(\dfrac{dV_{in}}{dt}-\dfrac{dV_{out}}{dt}\right)t}$

kdgamz · « **Reply #2 on:** November 01, 2009, 08:03:04 pm »

i use the last one...but i first solve inflow and ouflow separately somewhere else

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Author Topic: Setting out inflow/outflow (Read 1010 times) Tweet Share

NE2000

Setting out inflow/outflow

/0

Re: Setting out inflow/outflow

kdgamz

Re: Setting out inflow/outflow

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