Abstract
The heat-transport characteristics of a bubble-driven non-looped heat-transport device were experimentally measured. The device consists of a non-looped meandering copper tube containing water. The inner diameter of the tube is sufficiently small to allow the formation of vapor and liquid plugs in the tube. At steady state, most of the measured wall temperatures on the tube surface fluctuated periodically. These fluctuations had specific peak frequencies, which increased from 1.3 to 2.0 Hz when the heat-transport rate increased from 150 to 250 W. Time-averaged temperature gradients of the device were almost constant and similar to the case of the heat-conduction mode of a metallic rod. The effective thermal conductivity of the device is proportional to the heat-transport rate but does not depend on the gravity effect. These results indicate that the device is governed by oscillation-induced heat transport.
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