TH-3125 Unsteady State Heat Transfer

Experiments

  • Monitoring the changes in temperature for bodies of different sizes, shapes and materials, which are dropped into the hot water bath.
  • Analysis of the results obtained from different solid shapes using analytical temperature/heat flow charts provided.
  • Determination of the conductivity of a shape using the results obtained from similar shape made of different material.
  • Determination of BIOT number for solid cylinder.
  • To study the unsteady state heat transfer through lumped capacitance.

Specifications
A bench top unit designed to allow experiments on unsteady state heat transfer.

a)Water Bath

  • 30 liters insulated stainless steel tank with top plate and mounting for solid shapes holder.
  • The heating is by a 3.0kW electric heater with thermostat control while the water circulation is by a centrifugal pump with controlled flow rate.

b) Solid Shapes

  • 7 Pieces of solid specimens made of brass and stainless steel are supplied. The three different shapes are solid sphere, rectangular slab and long solid cylinder. Each solid shape has a built-in temperature sensor at the centre.

Description

The Unsteady State Heat Transfer unit is designed for the investigation of the temperature variation with time and heat flow within solid shapes that are subjected to sudden heating. The unit consists of a stainless steel water bath and integral flow duct with external water circulating pump. The bath has a capacity of approximately 30 liters and is heated by a thermostatically controlled 3 kW electric heating element in the base of the bath. Adjustment of the thermostat allows the bath to be set to a nominally constant temperature before beginning the experimental procedure. The heating element incorporates internal thermal protection so that power is switched off in the event of the heater being turned on when not covered by water. However, repeatedly allowing the heater to overheat in this way it should be avoided as it will eventually fail. The control panel is provided having all the necessary wiring, temperature measurements and digital indicators.

Software TH-3125SW (optional)
DAQ software specially designed in National Instrument™, LABVIEW™ environment to measure and calculate the results of apparatus. The software is optional and while using software a set of electronic sensors are included. Software can be run with any Windows™ environment.