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Oh

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the thermal energy storage or test

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experiments will fly aboard the space

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shuttle Columbia as part of NASA's

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office of aeronautics and space

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technology to carrier during the STS 62

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mission rolled engineers at the NASA

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Lewis Research Center are conducting

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materials research that will lead to the

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development of the next generation of

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power systems for future spacecraft

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fluoride salts have been selected as

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test material mainly because they melt

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and freeze at the high temperatures

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required for effective use in a

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space-based power system however a

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primary concern with fluorides

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is the change in volume as much as 30%

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when the test material is melted this

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change in volume produces a void or

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bubble when the material freezes how

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these voids behave under microgravity is

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not entirely understood suppose that

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when the salt freezes and contracts at

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zero gravity the void all forms near the

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surface of the container

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as we move from shade to sunlight there

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is no salt to conduct the heat away from

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the container surface at this point the

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container may be subjected to

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temperatures high enough to burn a hole

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on the other hand what happens if the

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void forms near the center of the

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container away from the surface since

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the salt nears the surface will melt

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first will there be enough room in the

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container to allow for the expansion of

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the salts from solid to liquid if not

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the containers may be distorted again

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hampering the entire system Oak Ridge

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National Laboratory in Tennessee has

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developed a three-dimensional program to

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describe in space void behavior in

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fluoride salts the program is named nor

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vex the nor vex called predictions for

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lithium fluoride salt behavior in space

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must be verified with data such data at

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the present time does not exist the test

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experiments have been developed to

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provide the low gravity data needed to

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verify the Norwex code a validated

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Norwex code will help lead to future

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solar dynamic power systems

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higher efficiency longer life and

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reduced weight to separate test

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experiments we'll fly aboard Columbia

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they are identical except for the

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the experiment section has a cylindrical

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canister charged with the test material

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a to zone heater surrounds the cannister

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the fluoride salts are melted here on

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earth and allowed to solidify with the

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cannister in a horizontal position

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this causes a void to be located along

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the canister wall at a position which is

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opposite the high temperature zone of

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the heater in the microgravity

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environment of space the test material

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will be subjected to four melt freeze

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cycles the acquired on-orbit data along

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with post flight data will determine the

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extent of the void movement toward the

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high-temperature heater zone the data

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will validate analytical predictions

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from the nor vex code the verified code

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will help lead to improved heat receiver

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designs for future solar dynamic power

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systems the thermal energy storage

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experiments are the first time these

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materials will be tested under extended

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microgravity conditions the acquired

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data is needed to verify analytical

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predictions for test material behavior

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these test experiments will point the

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way toward a reliable efficient and