I'm working on a heat exchanger design, with water as the coolant. I'm running an analysis on this thing, and it looks like it's going to get hot. Like, 900F hot. So, of course this is going to be steam by the time it reaches the outlet. I'm really not a fluids kind of girl, but it's on me to tell the experimental engineer whether this test is going to end in tears, and if it's going to be a problem, I want to try to talk him into using a different coolant. So, my question for forum! What happens to a heat exchanger when boiling occurs in the coolant flow? Should I be expecting sudden pressure increases? Losses in the maximum mass flow rate? Exploding heat exchangers? Some more information: -Fluid enters at around 200psi -Coolant is not immediately vented at the outlet, but enters a manifold and is piped a few feet off to be vented Thanks for your input!