October 31, 2018 at 8:04 am
October 31, 2018 at 9:13 am
October 31, 2018 at 9:52 amDevank12Subscriber
i am currently analysing flow through a concentric pipe using fluent. inner and outer pipes are made by copper and borosilicate glass respectively. the water flow inside the pipe is laminar. The space between the inner tube and outer cover tube made by vacuum (< 0.01Pa). i need to create a vacuum zone in the annulus gap.
November 1, 2018 at 11:57 amRobAnsys Employee
A useful approach for the vacuum section is to model it as a solid and adjust the conductivity to near enough zero: look up the Knudsen Number for continuum flow. You'll need to allow it to participate in radiation calculations otherwise the (I assume) solar energy won't get to the inner tube.
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