EXPERIMENTAL INVESTIGATION OF HYDRODYNAMIC AND HEAT TRANSFER PROCESSES IN THE HEAT EXCHANGER OF AN AIR COOLING SYSTEM

This paper presents an experimental investigation of hydrodynamic and heat transfer processes in the heat exchanger of an air cooling system under different air flow velocities and temperatures. When the air velocity varied from 2.5 to 4.0 , the Reynolds number ranged from 4700 to 8300, indicating a fully turbulent flow regime. The total pressure drop increased from 213.3 to 1158.7 , while the required fan power varied between 12.2 and 106.4 . The heat transfer analysis showed that the Nusselt number increased from 16.2 to 23.6, and the heat transfer coefficient rose from 13.5 to 20.1 . Based on the experimental results, an empirical correlation, , was proposed with a prediction error not exceeding ±1.6%.

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