Heat Augmentation Experiment Of Three Dimensional Thermosyphon

A new type of three-dimensional inner microfin tube is used in the present paper. And the two-phase closed thermalsyphon is made in such kind of tubes with two geometries, called T1 and T2 tube respectively. The refrigerant used in this heat transfer performance experiment of heat pipe is water and methanol. The experimental conditions are as follows: the heat flux is from 5 kw/m2 to 32 kw/m2, the working temperatures are between 40℃ and 95℃, the liquid full ratio is from 20%～40%, and respecting to the horizonal line the inclination angle is at the rang of 2°～90°.The experimental results indicate that the heat transfer in the microfin heat pipe has been greatly enhanced. In heating section the average boiling heat transfer coefficient he can increase 50.1%～238% and under small inclination(θ≤12°)can increase 40.6%～171.6%. In condensing section the average heat transfer coefficient hc can increase 100.9%～222.3% and under small inclination(θ≤12°)can increase 42.5%～184.7%.By analyzing experimental data obtain the heat transfer correlations of two types of inner microfin heat pipe as follows:Type T1 (angle 90°,fluid ratio 20%)Heating section( Tv :40～95℃,qe:5.21～30.94 kw/m2)Condensing section ( Tv :40～95℃,qc:5.61～31.82 kw/m2)Type T2 (angle 90°,fluid ratio 20%)Heating section (Tv :40～94℃,qe:5.11～24.75 kw/m2)Condensing section(Tv :40～94℃,qc:6.14～29.7 kw/m2)And the mean deviation between predicted and experimental data is within ±10%.