Natural Convection Apparatus Manufacturer,Supplier and Exporter in India
Product Code : EL-HTL-10046
Jlab Export is a leading Natural Convection Apparatus Manufacturer,and suppliers in India
Natural Convection Apparatus (code EL-HTL-10046) is a heat transfer unit with a vertical brass pipe, 38 mm OD and 500 mm long, heated from inside by a cartridge heater and housed in a 200 x 200 x 800 mm enclosure with one acrylic side. Seven thermocouples along the pipe give local temperatures for finding both the overall and the local natural convection coefficients. The vertical-pipe convection unit is produced by JLab in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Test pipe | Brass, 38 mm OD, 500 mm long, with a cartridge heater inside |
| Thermocouples | 7, along the length of the pipe |
| Enclosure | 200 mm x 200 mm x 800 mm, one side of acrylic sheet |
| Heater control | Dimmerstat |
| Input measurement | Voltmeter and ammeter |
| Temperature indicator | Multichannel digital |
| Supplied with | Technical manual |
| Electricity | 230 V, 5 A AC, with earthing |
| Bench area | 1.5 m x 0.75 m at working height |
| Quality check | Each convection 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-HTL-10046 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
Local Coefficients Along the Height
Taking the heat flux as uniform over the surface, q = VI/(πDL), with D = 38 mm and L = 500 mm. Each thermocouple then gives a local coefficient hx = q/(Tx − Ta), where Ta is the temperature of the surrounding air. Air warmed at the surface rises in a boundary layer that thickens towards the top, so the upper thermocouples read hotter and the local coefficient falls with height.
Overall Coefficient and the Enclosure
The mean of the seven readings gives the average surface temperature Ts, and h = VI/[πDL(Ts − Ta)] is the overall coefficient for the pipe. The enclosure keeps room draughts from disturbing the convection currents, while the acrylic side lets the pipe be watched as it runs. Repeating the test at other dimmerstat settings shows h rising slowly as the pipe gets hotter, because the buoyancy that drives the flow grows with the temperature difference. Results can be compared with a textbook correlation of the form Nu = C(Gr Pr)^n, using the pipe length as the characteristic dimension.
Other Natural and Forced Convection Rigs
- Heat Transfer In Natural Convection — vertical brass tube in a duct open at top and bottom, with an acrylic window.
- Pin Fin Apparatus — MS, brass and aluminium pin fins tested in natural and forced convection.
- Heat Transfer In Forced Convection — air from a blower through a test pipe wrapped in a Nichrome heater.
The unit is one of the Heat Transfer Lab rigs in Engineering Lab Equipment.
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Last updated: 30 October 2026
