H112D Combined Convection and Radiation

H112D Combined Convection and Radiation

A small scale accessory that allows experimental investigation of both natural and forced convection from a heated cylinder in a cross-flow configuration. The surface temperature of a duct mounted, 10mm diameter matt black cylinder may be varied over a wide range; thereby allowing the increasing effects of radiant heat transfer to be investigated as the temperature is increased.

A variable velocity airflow within the small diameter circular duct allow the effects on convective heat transfer from the cylinder to be investigated over the range of 0 to approximately 8m/s. An integral thermocouple on the surface of the electrically heated cylinder allows surface temperature to be measured at all operating conditions. This combined with a duct-mounted thermocouple, heater input power measurement and in duct air velocity measurement allows all of the relevant parameters to be recorded.

H112D Combined Convection and Radiation

A small scale accessory that allows experimental investigation of both natural and forced convection from a heated cylinder in a cross-flow configuration. The surface temperature of a duct mounted, 10mm diameter matt black cylinder may be varied over a wide range; thereby allowing the increasing effects of radiant heat transfer to be investigated as the temperature is increased.

A variable velocity airflow within the small diameter circular duct allow the effects on convective heat transfer from the cylinder to be investigated over the range of 0 to approximately 8m/s.

An integral thermocouple on the surface of the electrically heated cylinder allows surface temperature to be measured at all operating conditions. This combined with a duct-mounted thermocouple, heater input power measurement and in duct air velocity measurement allows all of the relevant parameters to be recorded.

The heater power supply and temperature sensors connect to the H112 Heat transfer service unit while velocity is recorded on auxiliary instrumentation supplied as part of the H112D demonstration unit.

The cylinder heater input power is controlled through the variable 240v ac supply from the H112 Heat Transfer Service Unit and is designed to operate at up to 100 Watts.

The variable velocity airflow is provided by an integral centrifugal fan. All relevant components are secured to a bench mounted plate that is designed to be situated alongside the H112 Heat Transfer Service Unit.

Requires the H112 Heat Transfer Service Unit for operation.

  • Determination of the combined heat transfer (QRadiation + QConvection ) from a horizontal matt black cylinder in natural convection over a wide range of power inputs and corresponding surface temperatures.
  • Measuring the domination of the convective heat transfer coefficient (Hc) at low surface temperatures and the domination of the radiation heat transfer (Hr) at high surface temperatures.
  • Determination of the effect of forced convection on the heat transfer from the cylinder at varying air velocities.
  • Investigation of the local heat transfer coefficient around the cylinder at varying air velocities.