Used this textbook through all of undergrad and grad school, and now it's the only reference text I keep at my desk as someone whose job title includes the textbook title.
https://www.amazon.com/Heat-Transfer-Gregory-Nellis/dp/110767137X
I am constantly referencing it, usually for a combination of conduction problems and internal flow correlations (sounds relevant for what you are doing). But there are also sections for heat exchange correlations, radiation problems, etc.
You also mentioned spacecraft - I assume you have a copy of the Spacecraft Thermal Control Handbook (Gilmore)?