both vacuum and gas-filled modes and the temperature profiles were plotted for comparison. In the gas-filled mode, the hot front propagation during startup was found to be solely diffusion controlled while in the steady state, axial conduction along the wall and wick determined the temperature profile of the front. The temperature of the hot zone remained more isothermal in the gas-filled mode than in the vacuum mode. As expected, the startup from the liquid state was smoother than that from the frozen
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