Thermal Conductivity of Metal Rod Manufacturer,Supplier and Exporter in India
Product Code : EL-TWL-9120
Jlab Export is a leading Thermal Conductivity of Metal Rod Manufacturer,and suppliers in India
Heat flows along a metal bar from an electric heater at one end to a water-cooled jacket at the other. Temperatures read at sections along the insulated middle give the gradient, and the cooling water flow and its temperature rise give the heat carried through. From these, students find the thermal conductivity of the metal and see how it changes with temperature.
Specifications
| Test piece | Metal bar |
| Heating | Electric heater at one end, input set by a variac |
| Cooling | Water jacket at the other end, constant water flow |
| Insulation | Cylindrical shell filled with insulating material around the middle portion |
| Readings | Bar temperature at several sections, water flow rate and water temperature rise |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 14–18 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Experiments on Heat Conduction
At steady state the heat leaving in the jacket water is Q = m cp ΔT. Students find the water mass flow m by timing a sample into a Measuring Cylinder with a Stop Watch. Fourier’s law then gives k = Q L / (A dT). Here dT is the temperature drop over a length L of the insulated section, and A is the bar cross-section.
A second exercise plots temperature against distance at two or three variac settings. The slope of each line gives the gradient, and the mean temperature of the section shows which temperature that value of k belongs to. Plotting k against mean temperature shows the trend for the metal.
Frequently Asked Questions
Why is the middle of the bar insulated?
The insulated shell stops heat leaking out sideways, so almost all the heat that crosses one section also crosses the next. The heat flow is then the same along the measured length and equals the heat picked up by the cooling water.
How do I know the bar has reached steady state?
Read all the section temperatures and the water outlet temperature every few minutes. The bar is steady when none of them changes between two sets of readings. Changing the variac setting starts a new warm-up, so allow time again before the next set.
Why is the temperature profile not a perfectly straight line?
If k were constant, the temperature would fall linearly along the bar. In most metals k changes with temperature, and since the same heat crosses every section, the gradient is steeper where k is lower. A slight curve in the plot shows this.
Why must the cooling water flow stay constant?
The heat balance uses the water mass flow and its temperature rise. If the flow drifts, the outlet temperature drifts with it and the bar never settles. Set the flow once at the start of a run and leave the valve alone until the readings are taken.
Other Heat Conduction Apparatus
- Heat Transfer Through Composite Wall
- Heat Transfer Through Lagged Pipe
- Heat Transfer From Pin-Fin Apparatus
- Composite Walls Apparatus
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Last updated: 6 November 2026
