i have aquestion

I have a filter for removal the impurities from the water.. this filter has a cross sectional area about 0.07065m2... and volume is 0.1766m3..

some materials ( beads ) were put inside the filter in order to filter the water.. the packed bed was around 0.60m length..and its volume was 0.046m3 of the filter..

The length of the filter is 2.5m and diameter is 0.30m

the beads ( materilas ) inside the filter need to be washed from time to time.. for this reason we use water or air for backwashing

My question: how could we know how much water or air that we have to pump it to the filter to clean these materials ?

You can make any assumptions if u need

I really need your help to solve this question.

Best regards

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 Quote by Bashir2008 I have a filter for removal the impurities from the water.. this filter has a cross sectional area about 0.07065m2... and volume is 0.1766m3.. some materials ( beads ) were put inside the filter in order to filter the water.. the packed bed was around 0.60m length..and its volume was 0.046m3 of the filter.. The length of the filter is 2.5m and diameter is 0.30m the beads ( materilas ) inside the filter need to be washed from time to time.. for this reason we use water or air for backwashing My question: how could we know how much water or air that we have to pump it to the filter to clean these materials ? You can make any assumptions if u need I really need your help to solve this question. Best regards
Use a flowmeter.

CS

 Recognitions: Science Advisor ...or a bucket and a stopwatch.

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i have aquestion

 Quote by FredGarvin ...or a bucket and a stopwatch.
Ah...the poor man's flowmeter!

I've actually done that before!

CS

 Recognitions: Science Advisor I do it quite often. It's hokey, but it works.
 I don't use a bucket, but a container that is graduated. That way I actually know how much water has been collected.
 Recognitions: Science Advisor A 5 gallon bucket does surprising well.

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 Quote by FredGarvin ...or a bucket and a stopwatch.
lmao. since we're all talking about buckets and stop watches... the most extreme bucket/stopwatch flow measurement I did was at a dock in Rotterdam. Found a rusty old 55 gallon drum that was dumped in a field. Took 20 seconds to fill it with sea water... That ruled out a pump problem for me!

 Sorry but you misunderstood me.. i did not mean how we measure the flow.. my question was : how could we know how much water we need exactly for this filter... and not how to measure it..

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