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Emissivity Natural Convection And Radiation
Emissivity Natural Convection And Radiation (Product Code: SLE/EA/10) is a heat transfer apparatus used to separate radiant heat loss from natural (free) convection around a heated element in engineering college laboratories. Students run its pressure vessel from 1 bar (gauge) of compressed air down to about 5 Pa (absolute) and extrapolate towards a total vacuum, where convection disappears. This engineering lab equipment in India is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Principle | Compares heat transfer by radiation and by natural (free) convection at different pressures and under vacuum |
| Test element | Small heated element hanging in the centre of a pressure vessel |
| Element surface | Matt black, with a thermocouple attached to measure its temperature |
| Vessel interior | Black, with a thermocouple fitted to the vessel wall |
| Pressure range | Charged with compressed air up to 1 bar (gauge) or evacuated down to about 5 Pa (absolute) |
| Pressure measurement | Two pressure transducers – one for pressures above atmospheric, one for pressures below atmospheric |
| Instrumentation | Instruments and a digital display for temperatures, pressures and power to the element |
| Learning outcomes | Emissivity of a surface; verification of the Stefan-Boltzmann equation; Nusselt, Grashof, Prandtl and Knudsen numbers |
| Product code | SLE/EA/10 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Natural Convection and Radiation Apparatus Used For?
In a typical practical, students heat the element and log its surface temperature, the vessel wall temperature and the electrical power at several vessel pressures, then plot heat loss against pressure. Because convection weakens as the gas thins out, extending the curve towards zero pressure leaves the radiation component on its own. From that value the emissivity of the matt black surface is calculated and checked against the Stefan-Boltzmann equation.
The same readings let learners work with dimensionless groups such as the Nusselt, Grashof, Prandtl and Knudsen numbers, which makes the unit a strong fit among lab equipments for technical institutes teaching heat transfer. Let the element and vessel settle at each pressure before recording, because steady values give a cleaner extrapolation.
OEM Manufacturer
ScienceLab is the trading name of Jain Scientific Equipments Private Limited, the OEM (original equipment manufacturer) of this apparatus. It is produced at the company's own licensed factory at Saha, Ambala, Haryana, India, and supplied factory-direct to engineering colleges, polytechnics, universities, dealers and importers. When a department needs a replacement thermocouple or a repeat unit for a second lab, it deals with the manufacturer itself — just ask us. Company background is on the ScienceLab company profile.
Related Thermodynamics & Heat Transfer Lab Equipment
These apparatus extend a radiation and convection practical into other heat transfer modes:
- Computerized Emissivity Measurement Apparatus — a second route to surface emissivity for comparing methods.
- Free and Force Convection Apparatus — moves the study from natural convection to forced air flow.
- Extended Surface Heat Transfer — conduction along a bar that loses heat by convection and radiation.
- Conductivity Of Liquid And Gases — measures conduction through a thin gas or liquid layer.
Browse the complete range of Thermodynamics & Heat Transfer Lab Equipment.
Frequently Asked Questions
What does the Emissivity Natural Convection And Radiation apparatus measure?
The Emissivity Natural Convection And Radiation apparatus measures the temperatures, vessel pressure and electrical power needed to find how a heated matt black element loses heat by radiation and by natural convection, so students can calculate its surface emissivity.
What pressure range does the vessel cover?
The pressure vessel of the Emissivity Natural Convection And Radiation apparatus can be charged with compressed air up to 1 bar (gauge) or evacuated down to about 5 Pa (absolute), giving a wide span of test points for the extrapolation to vacuum.
Why does the apparatus have two pressure transducers?
The Emissivity Natural Convection And Radiation apparatus uses one pressure transducer for pressures above atmospheric and another for pressures below atmospheric, so both pressurised and evacuated test points are measured accurately instead of stretching a single sensor across the whole range.
How is radiation separated from convection?
Students record the heat loss from the element at several pressures and extrapolate the results down to a total vacuum, where no convection can occur. The heat transfer that remains on the Emissivity Natural Convection And Radiation apparatus is then due to radiation alone.
Who manufactures the Emissivity Natural Convection And Radiation apparatus?
Jain Scientific Equipments Pvt Ltd, trading as ScienceLab, manufactures the Emissivity Natural Convection And Radiation apparatus as the OEM at its own licensed factory at Saha, Ambala, Haryana, India, and quotes it directly to institutions, dealers and importers.
Is a calibration certificate available?
Calibration-certificate availability for the Emissivity Natural Convection And Radiation apparatus should be discussed with us before ordering. Please state the requirement through the contact page so that it can be addressed in your quotation.
What should a quotation request include?
For the Emissivity Natural Convection And Radiation apparatus (SLE/EA/10), mention the quantity, your institution, the delivery location in India or abroad and any questions about electrical supply or accessories, so the manufacturer can prepare an accurate quote.
Request a Quote
To order the Emissivity Natural Convection And Radiation apparatus, send your requirement through the contact page or add it to the enquiry cart. Quotations come direct from the manufacturer for single units and multi-lab orders across India and international markets.
Last updated: 24 September 2026
