These equations are used to evaluate the overall heat transfer coefficient in the two-
phase region. Properties should be taken at the average temperature of the fluid.
Supercritical Fluids and Rocket Heat Transfer
For supercritical fluids the question is whether or not the heat transfer trends are
similar to that of sub critical fluids. This would help in an overall analysis of the fluids
used. The properties of the fluid will be different as well as the way the fluid reacts
chemically at such high pressures and temperatures. Some articles that can be helpful in
better understanding the phenomenon of supercritical fluids are Watts and Chou [13] as
well as Labuntsov [14]. Additional information on supercritical fluids is found in Sutton
and Ross [2]. The detail is limited about the supercritical region other than a graph that
shows that supercritical fluids follow the same pattern of heat transfer as sub critical
fluids except the nucleate boiling region. This graph is shown in the figure below.
,E
/ /
,f .Supercritical
coolant
T,1 T, (log scale)
Figure 2-3.Plot of Sub Critical and Supercritical Coolant Heat Transfer Referenced from
[2].