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Cryogenic Thermal Insulation Systems

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Variation of mean heat<br />

flux and total heat<br />

transfer with cold<br />

vacuum pressure for<br />

glass bubbles.<br />

Boundary temperatures<br />

are approximately 293<br />

K and 77 K. Residual<br />

gas is nitrogen.<br />

Heat Flux (W/m2) and Total Heat (W)<br />

1000<br />

100<br />

10<br />

H eat Flux, C 137<br />

Total Heat, C137<br />

1<br />

0.1 1 10 100 1000 10000 100000 1000000<br />

Cold Vacuum Pressure CVP (millitorr)

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