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once again we're receiving downlink

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the surface tension driven convection

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experiment

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there are several components to this

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chamber

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pi team concurs as flat as can be

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other features in this facility are

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the

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submerged heater

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which

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payload specialist fred leslie has

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recently

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moved from

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a point at which it was

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sticking out from

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the silicon fluid to a point where it is

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now

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actually submerged he filled this

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container with this silicon oil

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the silicone oil contains small

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particles which you see

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in the aero region are floating

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along the surface of the fluid

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and

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fred leslie has just reported that

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he has obtained a flat surface and

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experimenters on the ground

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have confirmed that they agree that the

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surface is flat as is desired at this

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we are currently receiving another

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video image from inside the surface

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tension driven convection experiment

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this camera is an infrared imaging

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camera that allows the experiment team

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to look at the temperature variations

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that exist on the surface

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okay step one

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okay that's complete

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do we have any other lights now

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well the same indications i'm getting

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the light keeps coming on about once

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did the messages displayed change or do

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uh the left window shows uh 17 on

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and that's a two decimal zero in slot

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okay

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os temp light is on pcg verify light tcg

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okay copy that

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left to right top to bottom 33.6

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43.3 34.3

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43.9 second row

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5.01

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that's five point zero one

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zero zero eight

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three three point eight four four point

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two

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third row

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one one point six

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one two zero

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this is mission control houston this

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view is of a

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television that was recorded previously

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on board columbia over the past uh

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two days that it's been in orbit by the

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crew they're playing that back now to

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the ground dumping

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this video down this video showing the

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cargo bay of columbia and the left hand

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payload bay door

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which has been in that

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halfway shut position uh since uh

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just a few hours after uh columbia set

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up shop on orbit to that halfway open

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position is designed to

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help further protect colombia from

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any possible impacts by orbital debris

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that it may encounter in its

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fairly low altitude orbit of

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145 nautical miles and also its extended

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time that will be spent in orbit of 16

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this is space lab operations huntsville

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payload commander kathy thornton working

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the controls of the drop physics module

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for the first attempt at deploying an

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actual liquid drop in that facility here

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on the

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during the mission

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and as we can see she has the drop

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suspended now uh still attached to the

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two injector

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and this first attempt as we heard a few

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minutes ago we'll be using a

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four cubic centimeter

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drop of liquid

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yesterday she was working a fair amount

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with the system but using

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solid test spheres or calibration

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spheres

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rather than liquids so

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she's proceeding

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slowly and carefully here to see if

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and uh

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kent rominger now uh taking a few photos

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of uh payload specialist al sacco who

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continues to be

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working with his

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hands inside the space lab glovebox

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he's in a fairly lengthy set of

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procedures to

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initiate protein crystal growth samples

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the

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using individualized or customized

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startup

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procedures for the samples

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and we can see two of the payload

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general support computers there in the

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lower left-hand corner of our current

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view

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thornton now making an entry on one of

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them

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and we also see that one of those pgse

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laptop computers shows the

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a tpr session in about five minutes

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this is space lab operations huntsville

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and as uh kathy thornton continues to

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work with the

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drop physics module uh

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kent romenger the sts-73 pilot now is in

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the module to take a few still photos to

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document the operations

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uh that's uh typically done uh to

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information about

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experiment operations during the course

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romans are on duty uh has

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on the redshift he serves as uh

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for the orbiter support functions that

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uh

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are necessary to provide

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the smooth platform that

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columbia has been

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and we obviously see the change of

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parameters

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causing uh

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some rather wide gyrations of the drop

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which thorn will be trying to bring back

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further modifying some of the

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some of the inputs

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when we hear the

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instructions about

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up

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obviously uh there's uh

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rather large effects from some of these

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changes and uh in understanding

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uh what the result is going to be from

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particular changes it's a certain amount

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of

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learning process or trial and error

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thornton continuing to try to see if

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some adjustments to the

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acoustic energy will

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get the drop centered up again and

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and reduce the

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motion

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and now she's actually looking inside

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the window of the test chamber rather

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than seeing the video

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since the drop is no longer visible on

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this was a drop of water

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just distilled water with the only

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additive to it being some small plastic

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particles

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that are suspended in the water

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in the case of this particular operation

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the the water has those particles in

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there for purposes of

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watching to see how the water droplet is

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rotating

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and now we can see she opens the

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access door to the

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experiment bay

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for the drop physics module

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and then we'll be

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accessing the actual test chamber

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two previous drops

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were manipulated and

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maintained in levitation for quite some

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she has now uh

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after um

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maintaining levitation on this drop for

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she is

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contact the drop with the injector

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needles

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and

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suck it back into the

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system of the drop physics module

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and uh we now see

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that

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kathy no need to reply but dpm says

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i'm having a lot of fun doing this

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we're having a lot of fun watching it

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and it is the flow along this top

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surface that scientists are interested

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in

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there are

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what are referred to as thermo capillary

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flows that result from the surface

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tension driven the surface tension

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variation along the surface of this

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liquid

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and the

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motion of these flows

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can be manipulated so that

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it become it goes from a two-dimensional

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flow

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this is accomplished by heating the

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surface

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uh

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laser

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flux

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or

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a by heating the internal

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center of this fluid by a submerged

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heater

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this in turn causes

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temperature variations across the

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surface of the oil and changes

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the direction of the flows

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changing from a two-dimensional to a

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three-dimensional mode

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it is this

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transition from two-dimensional to

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three-dimensional flow that the