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### Topic: extended time instead of lower centrifuge rotation?  (Read 1802 times)

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#### mana

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##### extended time instead of lower centrifuge rotation?
« on: August 26, 2023, 01:20:47 AM »
hi all
I need to centrifuge my sample to 2500g for 5 min which means 4144 rpm with (130 mm radius). the available centrifuge in our lab just can centrifuge ultimately on 3500 rpm.

what should I do? can I extend the time of centrifuge instead of it's lower speed or not? if I can how I can measure the extended time which is needed?

#### Hunter2

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##### Re: extended time instead of lower centrifuge rotation?
« Reply #1 on: August 26, 2023, 02:28:39 AM »
Try and error. I would say 4144 *5/3500 = 6 min.should be ok.

#### mjc123

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##### Re: extended time instead of lower centrifuge rotation?
« Reply #2 on: August 26, 2023, 03:32:28 PM »
The terminal velocity is proportional to the acceleration, which is proportional to the square of the RPM (a = ω2r). So I would try
time = 5*(4144/3500)^2