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Unsteady State Heat Transfer
Unsteady State Heat Transfer (Product Code: SLE/EA/19) is a transient heat transfer apparatus used to measure the temperature changes in solid test shapes suddenly immersed in a temperature-controlled water vessel in engineering laboratories. Its test shapes differ in dimensions and material, so students see how surface area, shape and thermal conductivity alter the rate of heat transfer. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM engineering lab equipment manufacturer, at its own factory in Ambala, India.
Key Details
| Parameter | Detail |
|---|---|
| Heating control | Controller switches the electric heater to keep a constant bulk water temperature in the vessel |
| Test condition | Temperature controller maintains a constant water temperature for the test shape |
| Test shapes | Different dimensions and materials, giving different heat transfer areas and thermal conductivities |
| Method | Sudden immersion of a test shape, with measurement of the resulting transient temperature changes |
| Bath stability | Large water volume compared with the test shapes, so immersion has a negligible effect on the bulk temperature |
| Instrumentation | Precision instruments measure temperatures at key points, shown on clear multi-line displays |
| Scope | Multiple experiments in heat transfer |
| Product code | SLE/EA/19 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Unsteady State Heat Transfer Apparatus Used For?
Many real heating and cooling processes, from quenching a metal part to warming food, never reach a steady state, and this apparatus lets students study that transient behaviour directly. They immerse one test shape, record how its temperature changes with time, then repeat with the other shapes and compare the curves. The exercise goes a step beyond a simple Newton law of cooling apparatus, because shape and material become variables as well.
The results can be checked against lumped-capacitance and transient conduction theory, introducing ideas such as the Biot number. Let the water reach its controlled temperature and start each shape from the same initial condition, so the comparison between shapes stays fair.
OEM Manufacturer
This apparatus is manufactured by Jain Scientific Equipments Private Limited, trading as ScienceLab, which is its OEM (original equipment manufacturer), at the company's own licensed factory in Saha, Ambala, Haryana, India. Departments equipping a thermal lab from scratch can have it quoted alongside other heat transfer apparatus from the same manufacturer. If additional or replacement test shapes are needed later, ask us directly. The ScienceLab company profile has more background.
Related Thermodynamics & Heat Transfer Lab Equipment
Pair transient tests with these steady-state and measurement experiments:
- Radial Heat Conduction Experiment — steady radial conduction for contrast with transient results.
- Extended Surface Heat Transfer — conduction along a heated bar with surface heat loss.
- Computerized Thermal Conductivity of Powder — measures the conductivity property that drives transient response.
- Temperature Measurement and Calibration Apparatus — builds confidence in temperature readings.
The full list is in Thermodynamics & Heat Transfer Lab Equipment.
Frequently Asked Questions
What does unsteady state heat transfer mean?
Unsteady state heat transfer means temperatures change with time rather than staying fixed. On the Unsteady State Heat Transfer apparatus, students measure the transient temperature changes in a test shape after it is suddenly immersed in the controlled water.
Why are the test shapes of different sizes and materials?
The test shapes of the Unsteady State Heat Transfer apparatus have different dimensions and materials, giving different heat transfer areas and thermal conductivities. Comparing their results shows how surface area, shape and thermal properties affect heat transfer.
How is the water temperature kept constant?
A controller switches the electric heater of the Unsteady State Heat Transfer apparatus to hold a constant bulk water temperature, and the large water volume means immersing a test shape has a negligible effect on that temperature.
How are temperatures read during a test?
Precision instruments on the Unsteady State Heat Transfer apparatus measure temperatures at key points and show them on clear multi-line displays, so students can follow the transient changes as they happen after immersion.
Who manufactures the Unsteady State Heat Transfer apparatus?
The Unsteady State Heat Transfer apparatus is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab) as the OEM at its own licensed factory at Saha, Ambala, India, and is supplied factory-direct to institutions, dealers and importers.
Can extra test shapes be ordered?
Additional or replacement test shapes for the Unsteady State Heat Transfer apparatus should be requested from the manufacturer. Send the product code SLE/EA/19 and your needs through the contact page and we will confirm what can be supplied.
Request a Quote
Request a quotation for the Unsteady State Heat Transfer apparatus through the contact page or by adding it to the enquiry cart. Quotations are prepared directly by the manufacturer for customers in India and international markets.
Last updated: 24 September 2026
