Forced Convection Apparatus
Product Code : EL-HTL-11084
Quick answer: The forced convection apparatus measures the heat transfer coefficient for air blown through a heated pipe. A centrifugal blower drives air through a 32 mm NB, 500 mm GI pipe wrapped with a band heater, an orifice meter reads the airflow and a digital indicator gives the wall and air temperatures. Lab Exports manufactures it in Delhi for engineering colleges, polytechnics and TVET institutes.
Specifications
| Component | Specification |
|---|---|
| Test pipe | GI, 32 mm NB, 500 mm long |
| Heater | External band heater |
| Heater control | Variac, 2 A |
| Blower | Centrifugal, with flow control valve |
| Airflow measurement | Orifice meter with differential water manometer |
| Power measurement | Voltmeter and ammeter |
| Temperature measurement | Multichannel digital indicator: pipe surface, air inlet and outlet |
| Services | 230 V, 15 A AC supply with earthing; bench area 1 x 0.75 m |
How the forced convection experiment is done
With a blower moving the air, convection is far stronger than in still air. The heat picked up by the air is Q = m cp (T_out - T_in), and the coefficient is h = Q / (A (Ts - Tb)), where Ts is the mean wall temperature and Tb the mean air temperature. The band heater gives a near-constant heat flux along the pipe.
For turbulent flow in a pipe, measured values are compared with the Dittus-Boelter correlation, Nu = 0.023 Re^0.8 Pr^0.4, where the Reynolds number depends on the air velocity found from the orifice meter. Raising the airflow raises Re and, with it, h.
- Start the blower and set the airflow with the flow control valve.
- Switch on the heater and set its input with the Variac.
- At steady state, record the orifice meter manometer, the heater input and all temperatures.
- Calculate the air mass flow, the heat gained by the air and h.
- Repeat at other airflows and compare with the correlation.
Key features
- 32 mm NB GI test pipe, 500 mm long, heated by an external band heater
- Centrifugal blower with flow control valve for a range of air velocities
- Orifice meter with differential water manometer for the airflow
- Wall temperatures along the pipe plus air inlet and outlet temperatures
- Variac, voltmeter and ammeter to set and measure the heat input
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the forced convection apparatus at its works in Laxmi Nagar, Delhi, and supplies it to engineering colleges, polytechnics and TVET institutes in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Heat Transfer Lab products
- Natural Convection Apparatus (EL-HTL-11083)
- Specific Heat of Air Apparatus (EL-HTL-11085)
- Pin Fin Apparatus (EL-HTL-11082)
- Critical Radius of Insulating Material (EL-HTL-11081)
- Heat Transfer in Agitated Vessel (EL-HTL-11087)
- Heat Pipe Apparatus (EL-HTL-11080)
The full range is in the Heat Transfer Lab section of the Engineering Lab range.
Frequently asked questions
What does the forced convection apparatus measure?
It measures the heat transfer coefficient for forced convection inside a heated pipe at different airflow rates and heat inputs.
How is the airflow measured?
An orifice meter in the air line is read on a differential water manometer.
What services does the apparatus need?
A 230 V, 15 A AC supply with earthing and a bench area of about 1 x 0.75 m.
What is the price of the forced convection apparatus?
Prices are not published on the website. Add the forced convection apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-HTL-11084 and the quantity, to receive a quotation.
Does Lab Exports manufacture the forced convection apparatus?
Yes. Lab Exports manufactures the forced convection apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-HTL-11084.
Request a quote
Email [email protected] with the house code EL-HTL-11084 and the quantity, or add the forced convection apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.