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October 11, 2010, 00:05
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interesting question in fluid mechanics
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#1 |
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New Member
stud
Join Date: Mar 2009
Posts: 8
Rep Power: 17  |
Consider a person is walking first in air and then in water at same speed. For which motion will be the Re be higher and why?
please post your answers? |
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October 11, 2010, 00:44
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#2 |
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Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 452
Rep Power: 23 |
Considering the person as an sphere falling in a fluid, Re=v*D/nu, so Re will be greater in air.
Regards.
__________________
Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar |
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October 11, 2010, 02:26
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#3 |
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New Member
stud
Join Date: Mar 2009
Posts: 8
Rep Power: 17 |
nu(kinematic viscosity) for water is smaller than air at room temperature.
So Re is higher for when person moves in water. |
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October 11, 2010, 11:29
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#4 |
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Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 452
Rep Power: 23 |
Aha, it is around twenty times greater, rho did the trick.
Regards.
__________________
Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar |
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