A question here, behaviour of water on Mars |
A question here, behaviour of water on Mars |
May 24 2007, 12:38 AM
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#1
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Junior Member Group: Members Posts: 58 Joined: 17-September 06 Member No.: 1150 |
A question here
There are signs that in the past there was liquid water on Mars. So lets assume thats true. Since the gravity on Mars is much lower than on Earth, so how does water (waves) behave on Mars compared to Earth? Someone did say, that waves would have been much higher but also much slower. Is this true? Does anyone have an animation where you can see a waive on Earth in comparsion to a wave on Mars? Thanks |
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May 24 2008, 03:21 AM
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#2
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Junior Member Group: Members Posts: 98 Joined: 24-November 04 Member No.: 111 |
A question here There are signs that in the past there was liquid water on Mars. So lets assume thats true. Since the gravity on Mars is much lower than on Earth, so how does water (waves) behave on Mars compared to Earth? Someone did say, that waves would have been much higher but also much slower. Is this true? Does anyone have an animation where you can see a waive on Earth in comparsion to a wave on Mars? Thanks Many chemists use a piece of equipment called a 'rotary evoporator', more commonly called a 'rotovap', to quickly evaporate solvents out of a round bottom flask to leave behind a concentrated liquor or salts. In a rotovap, the flask containing the liquid is rotated at an adjustable speed (which can be a quite fast rpm) + an adjustable vacuum is applied to suck off the solvent + an adjustable optional heating is applied to the flask exterior via a heating bath, which can be heated up to 100C.I n this setup, you can also induce sloshing of the liquid by jarring the equipment. Sometimes it is useful to cause sloshing to prevent 'bumping' which is rapid nucleation and boil-over from a super-saturated condition. So basically you can watch the behavior of evaporating liquid at various g-forces (centrifugal spinning) of 1 or higher, at various vacuum forces (1 atm to near zero), with applied external heating or not. If you do this using a rotovap, and induce sloshing, then you can see the behavior of waves as a function of vacuum or as a function of gravity (g=1 or greater). So I tried with water. It seems that slosh-induced waves settle down the same speed regardless of applied vacuum. (i.e. vacuum has no obvious effect on wave height). It seems that slosh-induced waves are smaller and settle down faster as the centrifugal force increases. (i.e. increasing gravity greater than earth's gives smaller waves). From this I would infer on Mars that wave heights would be higher due to a lower surface gravity, and the reduced atmosperic pressure would not be a significant effect on waves. |
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May 24 2008, 01:27 PM
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#3
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Member Group: Members Posts: 610 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
If you do this using a rotovap, and induce sloshing, then you can see the behavior of waves as a function of vacuum or as a function of gravity (g=1 or greater). So I tried with water. It seems that slosh-induced waves settle down the same speed regardless of applied vacuum. (i.e. vacuum has no obvious effect on wave height). It seems that slosh-induced waves are smaller and settle down faster as the centrifugal force increases. (i.e. increasing gravity greater than earth's gives smaller waves). From this I would infer on Mars that wave heights would be higher due to a lower surface gravity, and the reduced atmosperic pressure would not be a significant effect on waves. More of this kind of experiment needs to be done! Some related wind-tunnel experiments I did are at http://www.lpl.arizona.edu/~rlorenz/marswit.pdf Note that while atmospheric pressure doesnt affect waves directly, it appears to strongly influence how effectively momentum is coupled from wind into the liquid. I wonder if the sloshing in this rotovap thingy relates to the centrifugal force due to the mechanical configuration. I'd imagine that these waves are small enough that they are capillary waves (controlled by surface tension) rather than gravity waves... |
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