Transient State. Transient tests were conducted in order to map the startup behavior of the heat pipe. The temperature variations along the length as a function of time were graphed for various power levels. Figs. 10 and 11 show the axial profiles at 20, 30, 60 and 150 min after the application of power input for QO = 96.6 W and 257.7 W respectively. The moving hot zone temperature front at 20 min is in the adiabatic zone and the profile of the front is relatively flatter than that in the condenser zone at 150 minutes. At 150 minutes, the front is completely in the condenser zone and is more
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