Abstract
We used paper fiber as wick structure and designed a flat loop heat pipe which could operate successfully. The evaporator was made of cooper while the wall of the compensation chamber and the transport line were both made of glass. While it operated correctly, we could observe the condition of the working fluid in the compensation chamber and the transport line. We have three kinds of transport lines. One was a smooth glass tube; the others were wick glass tubes with cooper meshes inside the tube. The comparison between the different transport lines was obtained. The working fluid flowed steadier in the wick glass tube than the smooth glass tube. We also designed a different evaporator structure, but this one couldn’t operate successfully. The reason of this failure was also discussed.