The relationships for heat transfer by forced convection can be investigated with this trainer.
A fan draws air through a duct with a streamlined inlet element that provides a homogeneous flow. The flow rate can be varied using an adjustable flap on the fan outlet. The duct contains an interchangeable pipe bundle heat exchanger element. One of the pipes can be heated individually. The heat transfer as a function of the pipe position can therefore be determined. The air velocity distribution before and after the heat exchanger element can be measured using a Pitot tube. Three other heat exchangers are available as accessories.
Quick-release fasteners enable the various heater exchanger elements to be easily changed. Temperatures and heating capacity are digitally displayed.
Learning Objectives / Experiments
- Relationships between Nusselt, Reynolds and
heat flux
- Measurement of the pressure distribution and
development of the speed gradient - Development of families of characteristic curves
[1] Convective heat transfer [2] Exchangeable pipe bundle as heat exchanger [3] 2 heaters can be inserted in a bundle or alone [4] Airflow rate adjustable [5] Pitot tube and pressure measurement station to determine air velocity [6] Display and control unit indicates air temperature, heater temperature and heating capacity
