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In current research, forced convective heat transfer performance of sequential and simultaneous heat exchanger modules are numerically investigated. The both modules of heat exchangers are identical in height, frontal area, and volume. The simulations have been conducted on serpentine finned heat exchangers in air-to-liquid crossflow orientation. ANSYS FLUENT, a widely used finite volume method based commercial code has been used in the numerical simulations. The heat transfer is concurrently obtained for single phase automatic transmission fluid (ATF) and 50-50 ethylene glycol-water mixture (EG). In liquid-side, the inlet temperature of ATF and EG have been kept constant at 1500C and 1050C respectively. For both the sequential and the simultaneous orientations, ATF and EG at various mass flow rates within a laminar flow regime have been cooled by air with inlet constant temperature of 250C and velocity of 6.3 m/s. Heat transfer and flow parameters, including approach temperature, heat transfer rate, heat transfer coefficient, effectiveness, and pressure drop have been predicted for the both heat exchanger modules. For a given Reynolds number, simultaneous module predicts significant enhancement of heat transfer rate as well as heat transfer coefficient than that of the conventional sequential module. The liquid-side pressure drop in simultaneous module is predicted significantly higher than that of the sequential module which necessitates a more powerful pump for potential applications. However, difference in the airside pressure drop between the two modules is predicted to be insignificant.

Comparison of Fluid Flow and Thermal Characteristics of Sequential and Simultaneous Crossflow Heat Exchangers