Radiation. His last hope. Kaelen stared at the Stefan–Boltzmann law in Chapter 12. In a vacuum, radiation was the only game in town. He grabbed a roll of thin aluminized mylar—normally used for insulation—and a canister of dark, soot-like carbon powder from an old air filter.
Fundamentals of Heat and Mass Transfer had saved them all. Not through brute force or exotic technology, but by reminding him that heat always finds a way—through solids, fluids, or empty space. And sometimes, the emptiest space of all is the one where clever engineers let physics do the heavy lifting. Fundamentals of Heat and Mass Transfer
He turned to convection. “Fine,” he said, pulling up schematics of the backup loop. He could vent the reactor’s secondary helium coolant into a makeshift radiator—a long, coiled tube he could snake across the crater floor. But without a pump, the helium would move by natural convection only. He ran the Grashof and Prandtl numbers in his head. The buoyancy-driven flow would be too slow. The tube would melt before the heat ever reached the far end. Radiation