Abstract
Heat pipes, which are heat transfer devices with high thermal conductance, have been studied extensively because of their applicability and efficiency. However, only a small number of studies have been conducted on relatively long heat pipes. Here, the thermal hydraulic characteristics of a long heat pipe are studied. In particular, the entrainment limit—an important design parameter—is examined to determine its sensitivity to the length-to-inner-diameter (L/D) ratio. Experiments are performed to measure the entrainment limits of heat pipes with various length scales. It is found that the entrainment limit points are affected by the L/D value of the heat pipe; this effect has not been considered in former correlations. Thus, a new modifying factor that includes the effect of L/D is formulated from experimental results. The correlation with the modifying factor showed good agreement with experimental results obtained in both former researches and the present study.
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