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Question: establish a heat transfer model for heat leakage estimation of...

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Establish a heat transfer model for heat leakage estimation of a liquid-nitrogen tank. The tank is a double-layer cylinder, with a vacuum gap between layers, and a top-end insulation plug. The only possible heat transfer over the vacuum gap is by thermal radiation. For the inner-layer, the heat conductivity is proportional to local temperature. Assuming all geometric and properties are given Convective heat transfers are also known

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