Heat transfer and hysteresis characteristics in an elbow thermosyphon

Measurements were performed to characterize the performance of a grooved copper–water elbow thermosyphon with a fluid loading of 30%, typical of thermosyphons used for power electronic devices. The evaporator section was vertical, while the condenser section was inclined at an angle 8°to the horizontal. The performance of the device, characterized for incrementally increasing and decreasing heat transfer rates, shows a significant hysteresis in …