A helium-cadmium (blue ink) laser used in a copying machine printer contains He at a nominal pressure
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Question:
A helium-cadmium (blue ink) laser used in a copying machine printer contains He at a nominal pressure of 460 Pa. The glass outer shell has a volume of 150 cm3, an area of 550 cm2, and a wall thickness of 1.52 mm.
At normal operating conditions the average temperature of the gas in the tube is 225 oC and the shell temperature is 115 oC. Estimate
i) The helium leak rate,
ii) The time required to lose 1 % of the helium inventory.
For the helium-shell glass (1-2) system the solubility coefficient and diffusion coefficient are
S'=/0.007+3.0*10^-5(ToC)
= 1.4*10^-8 e^(3280/TK) /s
Related Book For
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn
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