Dunk, found that link; here is the link to the IEEE Paper that compared the performance of the various heat pipe capiliary architecture types in different orientations. It's full of wonderful graphs and as you'd expect they explain the test rig setup and procedures. After reading the Conclusions I was convinced that only sintered heat pipes should be used in our cameras.
https://www.enertron-inc.com/pdf/res...ientations.pdf