Abstract
Hysteresis effects of annular e ow in rotating stepped wall heat pipes are addressed based on visualization and systematic experiments. The region of hysteretic annular e ow is dee ned. Experimental data relating the condensation heat transfer for annular e ow in a rotating stepped wall heat pipe are presented. A model for predicting the condensation heat transfer coefe cient is proposed. The theoretical result is compared with experimental data. The effect of vapor shear drag on the condensation heat transfer is discussed.
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