Heat Transport Characteristics of a Closed Two-Phase Thermosyphon

抄録

The heat transport characteristics of a thermosyphon are investigated experimentally using R 113, methanol, and water as the working fluids. The condensation heat transfer coefficient of the cooling section shows a trend to decrease with increasing wall temperature difference .This trend is similar to Nusselt's prediction. However, its value is considerably lower under the condition of high vapor velocities. Based on the heat transfer characteristics of the heating and cooling sections, nondimensional expressions are derived to relate the heat transport rate to the temperature difference between the heating and cooling sections .These expressions are compared satisfactorily with the measured results.