Experimental Investigation of Heat Transfer and Flowing Resistance for Air Flow Cross over Spiral Finned Tube Heat Exchanger

Abstract

In order to study heat transfer and flowing resistance characteristics for air flow cross over spiral finned tube heat exchanger, 13 spiral finned tube bundles heat exchangers are experimental investigated, the specimens have constant outer diameter of base tube (d=32mm), different fin pitch (t/d=0.22∼0.5), fin height (h/d=0.22∼0.5), transverse tube pitch (S1/d=2∼3.3125), longitudinal tube pitch (S2/d=2∼3.3125), the experiments are done within the range of fluid flowing Re number (Re=5×103∼5.5×104). Experiments obtain heat transfer Nusselt number correlation and flowing resistance Euler number correlation with fluid flowing Re number, fin pitch t, fin height h, transverse tube pitch S1, and longitudinal tube pitch S2.