Determination of Heat Transfer Coefficients inNatural and Forced Convection for DifferentGeometric Configurations, Using a PrototypeControlled by LabView Software and ArduinoHardware

Abstract

The research consists of the automation of a rotating test tunnel, through an interactiveplatform, with heating systems by means of electrical resistances coupled to test pieces indifferent geometric configurations. The working fluid is air, applying a flow controlled by afan through the mobile duct, at different angles of inclination. Thermodynamic variables aremonitored by Arduino hardware that allows information processing. The signals are sent anddisplayed using the platform integrated by the LabView control and design software; Withinthe programming with the application, the coefficients of natural and forced convectionobtained experimentally, showed a deviation of less than 5% compared to the theoreticaldata in different conditions of heat transfer by this mechanism, taking into account that thetemperature sensors have a sensitivity of 0.25 °C, giving the equipment reliability andconfidence of up to 95% accuracy, with air speed in the range of 1.5 to 2.4 m/s.