are shown in Fig. 9. The adiabatic zone temperatures are isothermal at each power level and the position of the hot front lies at different axial locations in the condenser zone. The characteristic diffusion controlled front profile of the gas slugged heat pipe is evident from this figure. The slant of the front is off-vertical and the temperature of the cold zone increases progressively with increasing Qo. This signifies the dominance of axial conduction over the diffusion mechanism at steady state when the energy carried by diffusion is negligible.
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