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Title: Effect of pressure gradient changes on laminar flow Post by: magatoni on Jun 25, 2013 Hi. If flow is laminar, what happens to flow when the pressure gradient changes from 100mmhg (120-20mmhg) to 150mmhg (160-10)?
I was applying poiseuille's law however the answer choices are: A) no change B) decreases by 50% C) increases 1.5x D) increases 2x I'm told the answer is C but if you consider the law and that flow is directly proportional to pressure gradient changes, I wouldn't think that C is the answer. To double flow, pressure must quadruple, right? I see that flow should increase but the answer (1.5x) puzzles me. It seems like an odd increase. Any thoughts!? Thanks! Title: Re: Effect of pressure gradient changes on laminar flow Post by: bio_man on Jun 25, 2013 Answer should be: it increases by 1.5 times.
Title: Re: Effect of pressure gradient changes on laminar flow Post by: grkpalikari on Jun 25, 2013 Hi, multiple sources I checked say the same thing as bio_man. See the attachment also.
Title: Re: Effect of pressure gradient changes on laminar flow Post by: magatoni on Jun 25, 2013 Hi. Thank you but I am not seeing how you are getting that answer.
If the gradient changes by 50mmhg, how is the resultant flow increase 1.5x? Title: Re: Effect of pressure gradient changes on laminar flow Post by: bio_man on Jun 25, 2013 100mmhg (120-20mmhg) to 150mmhg (160-10)? Hi again, Two times bigger than 100 is 200. Therefore, 1.5 times bigger than 100 is 150. I'm just using that school of thought. |