I'll admit upfront that I am not an engineer - I am a refining & fuels guy with the oil industry. But I was struck by the fact that AAIB interim report 2 clearly reported that ice accumulated on the face of the FOHE and melted fairly rapidly until the test rig became too cloudy to see what was going on. Surely the idea must be to increase the transfer of heat between oil & fuel. How does remachining the physical face of the FOHE achieve that? Surely you either have to increase the recirculation rate of the oil or elongate the matrix to improve heat transfer. As I am clueless here I am happy to be abused on this!
Pinkman