Unsteady State Heat Transfer Unit Manufacturer,Supplier and Exporter in India
Product Code : EL-USHTU-7381
Jlab Export is a leading Unsteady State Heat Transfer Unit Manufacturer,and suppliers in India
Unsteady State Heat Transfer Unit (code EL-USHTU-7381) is a transient conduction set-up in which a small test cylinder is placed in a hot water bath held at constant temperature, and the temperature at its centre is followed until it levels off. A heater with a digital temperature controller and an agitator keep the bath steady. This bath-and-cylinder unit is manufactured by JLab in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Test piece | Small cylinder |
| Temperature sensor | Inserted at the centre of the cylinder |
| Water bath | Hot water, with heater |
| Bath temperature control | Digital temperature controller |
| Agitator | Keeps the bath temperature constant |
| Quality check | Each unit is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 14–18 working days |
| Product code | EL-USHTU-7381 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
Reading the Heating Curve
The cylinder starts at room temperature Ti and goes into the bath at T∞. Centre temperatures noted at regular time intervals give a curve that rises quickly at first and flattens as T approaches T∞; this dependence on time is what makes the heating an unsteady-state problem. Expressed as θ = (T − T∞)/(Ti − T∞), the temperature falls from 1 towards 0 during the test.
Biot Number, Fourier Number and h
The Biot number Bi = hLc/k compares the resistance to conduction inside the cylinder with the resistance to convection at its surface, and the Fourier number Fo = αt/Lc² is the dimensionless time. If Bi is small, the cylinder behaves as a lumped capacity, θ = exp(−hAt/ρcV), and h comes from the slope of ln θ plotted against t. Otherwise the measured centre temperature is matched with the Heisler chart for the centre of a cylinder at the known Fo, which gives Bi and so h. Here Lc is V/A for the lumped method and the radius for the Heisler chart; k, ρ, c and α are the conductivity, density, specific heat and diffusivity of the cylinder material, and A and V its surface area and volume.
Other Conduction Set-ups
- Unsteady State Apparatus — copper, MS and brass test pieces with a heated water bath.
- Thermal Conductivity of Metal Rod — steady-state conduction along an insulated, water-cooled copper bar.
- Thermal Conductivity of Insulating Powder — steady radial conduction through powder between copper spheres.
The unit appears under Unsteady State Heat Transfer Unit, a category of JLab’s Heat Transfer Lab Equipment.
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Last updated: 30 October 2026