The influence of fluid inventory on the heat transfer performance of flat loop heat pipe

As for a specific flat loop heat pipe which our lab designed, with pure water as the working fluid, we have performed a series of experiments for six different fluid inventory(36.5%, 58.3%, 63.6%, 68.0%, 74.6%, 86.2%) under the same condition to study the effect of fluid inventory on the heat transfer performance. This is a meaningful work for choosing more suitable fluid inventory for LHPs. The results show that, the LHPs with 58.3%, 63.3% and 68.0% fluid inventory were relatively better on the heat transfer performance. Below 60W, the operating temperature of 58.3% was the lowest; above 60W, the 63.3% was the lowest. Under the same heat load, the loop resistance of 58.3% was the lowest. When it came to the system resistance, below 60W, the 58.3% showed the lowest; while above 60W, 63.6% showed the lowest.