H112G Unsteady State Heat Transfer

H112G Unsteady State Heat Transfer

A small scale bench top accessory designed to allow experimental investigation of unsteady state heat transfer by conduction and convection. Instrumented solid shapes of different materials are plunged into a controlled temperature water bath and the temperature change at the geometric centre of the shapes are recorded at regular intervals. As the shapes are of regular geometric form standard empirical methods may be used to predict the temperature variation with time and determine factors about the material properties.

H112G Unsteady State Heat Transfer

A small scale bench top accessory designed to allow experimental investigation of unsteady state heat transfer by conduction and convection.

Instrumented solid shapes of different materials are plunged into a controlled temperature water bath and the temperature change at the geometric centre of the shapes are recorded at regular intervals.

As the shapes are of regular geometric form standard empirical methods may be used to predict the temperature variation with time and determine factors about the material properties.

The accessory also allows investigation of the lumped thermal capacitance method of thermal analysis.

The seven shapes supplied comprise rectangular slabs (2), spheres (2), small diameter cylinders (2), large diameter cylinder (1). Where two identical shapes are supplied the materials are plated brass and stainless steel. The large diameter cylinder is plated brass. Each shape has a thermocouple at its geometric centre and is fitted into a shape holder, which allows it to be safely immersed in the controlled temperature water bath.

The controlled temperature water bath has a variable speed circulating pump and central cylindrical flow channel to establish stable forced convection conditions to be maintained around the immersed shapes.

Bath temperature, shape temperature and convective stream temperature are recorded. All the thermocouples and the variable speed circulating pump power supply plug directly into the H112 Heat Transfer Service Unit and readings are displayed on digital panel meters. The water bath heater operates directly from the local mains supply.

All major 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.

  • Observation of unsteady state conduction of heat to the centre of a solid shape (Qualitative, using a chart recorder, manual recording or the optional Computer Upgrade HC112 accessory) when a step change is applied to the temperature at the surface of the shape.
  • Using analytical transient-temperature/heat flow charts to determine the thermal conductivity of solid shapes from measurements taken on similar shapes of different thermal conductivity.
  • Investigation of the effect of shape, size and material properties on unsteady heat flow.
  • Investigating the Lumped Thermal Capacitance method of transient temperature analysis.