4279. Ratio of tube length to shell diameter for a shell and tube heat exchanger is September 7, 2025 by Admin 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers. 4 : 1 to 8 : 1 for liquid-liquid exchanger. < 4 : 1 for gas-gas exchangers. both(b) & (c). ✅ The correct answer is option D.
