Numerical performance comparison of different tube cross-sections for heat recovery from particle-laden exhaust gas streams

摘要: Abstract Heat recovery from exhaust gas streams is applicable to a wide variety of industries. However, high heat transfer resistance gases and the presence entrained particulate matter that readily fouls limits industry uptake current technology. Improvements standard exchanger designs are needed. In this study Computational Fluid Dynamics (CFD) used investigate effect ten different tube cross-sections on resistance, flow foulability. The average wall shear stress around shape predict foulability an estimated asymptotic fouling calculate equivalent fouled Coulburn j factor, jf. CFD results show best for elliptical closely followed by flattened round tube. ellipse produced jf values, expressed as ratio bank friction factor f, over 100% higher than A also promising, given enough spacing between tubes, may be practical economic optimum.