Carnot, Thompson, Clausius, Gibbs, Rankine, Boltzman etc all made big historical contributions to modern understanding of Thermodynamics.
And for Fluid Dynamics: Euler, Bernoulli, Mach, Stokes and so on.
And if you are looking for someone more modern I'd say Ergun (Packed bed's, Fluidized Bed Reactors etc).
All builds upon "steam science"
Carnot, Thompson, Clausius, Gibbs, Rankine, Boltzman etc all made big historical contributions to modern understanding of Thermodynamics.
And for Fluid Dynamics: Euler, Bernoulli, Mach, Stokes and so on.
And if you are looking for someone more modern I'd say Ergun (Packed bed's, Fluidized Bed Reactors etc).
All builds upon "steam science"