Convective Heat Transfer In Air Flow

Product Description

Description:

Convectiveheat transfer is the transfer of heat between a surface and a fluid. Theprocesses of convective heat transfer are associated with the movements of the fluidthat is to say with convection. In the case of forced convection, thefluid is fed by a pump or fan onto the transfer surfaces, whereas in the caseof free convection, the flow occurs only under the effect of the densitydifferential of the heated fluid. The Convective heat transfer In Air Flowand its accessories allow studying the convective heat transfer with differentgeometries of the transfer surface. Typical models such as the tubebundle, the heated tube from the outside and the heated cylinder from theinside are observed. It is also possible to show the chimney effect insidea ventilation shaft during free convection. The measuring section is an airduct with fan, in which the model of heat exchanger can be fixed easily andquickly using quick couplers. The air passes in front of the model, warmsitself up and leaves by a ventilation shaft. In the air duct, aflow-friendly inlet member provides a homogeneous flow for conducting thetests. The volumetric flow rate is adjusted by a butterfly valve locatedat the fan outlet. To make it possible to observe the tests, the air ductis equipped with two windows. The model included in the bundle heat exchangerdelivery list includes two exchangeable tubular bundles of differentgeometries. An immersion heater, which can be placed anywhere in the tubebundle, simulates a heated tube. The convective heat transfer can thus bedetermined according to the position of the tube. Other models areavailable as accessories. A pitot tube and a pressure measuring device make itpossible to determine the speed distribution in front of and behind themodels. The heating power and the volumetric flow can beadjusted. The heating power and the temperatures of the air and the heaterare displayed numerically.

Specification:

1. Convectiveheat transfer in case of forced convection
   
2. Air duct withflow-friendly inlet and windows for observation of tests
   
3. Exchangeabletubular bundles with two different diameters included in the delivery list
   
4. Immersionheater Ø 10mm or Ø 13mm insertable at the desired position in the tube bundle
   
5. A ventilationshaft allows free convection tests and the demonstration of the chimney effect
   
6. Ø 10mmimmersion heater insertable into the ventilation shaft
   
7. Immersionheaters protected against overheating
   
8. Adjustableair volume flow
   
9. Mobile pitottube with pressure measuring device for determining a speed profile in the caseof forced convection
   
10. Display ofair temperature, heating temperature and heating power
    

Technical Characteristics:

Air duct:

1. Flow crosssection: 150x150mm
   
2. Length:1540mm
   

Fan:

1. Power: 1,5kW
   
2. Volume flowrate: 2160m 3 / h
   

Tubularbundle:

1. 23x tube (Ø10mm)
   
2. 23x tube (Ø13mm)
   

2 Immersionheaters:

1. Length: 130mm
   
2. Power: 220W(Ø 10mm)
   
3. Power: 250W(Ø 13mm)
   
4. Protectionagainst overheating at 80 ° C
   

Measuringranges:

1. Pressure: ±200mbar
   
2. Temperature:2x max. 80 ° C
   
3. Power: 0 ...400W