The Convective heat transfer In Air Flowand its accessories allow studying the convective heat transfer with different geometries of the transfer surface. Typical models such as the tubebundle, the heated tube from the outside and the heated cylinder from the inside are observed. Convective heat 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 density differential of the heated fluid. The air passes in front of the model, warms itself 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. An immersion heater, which can be placed anywhere in the tubebundle, simulates a heated tube. The convective heat transfer can thus be determined according to the position of the tube. Other models areavailable as accessories. 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 and quickly using quick couplers. To make it possible to observe the tests, the air ductis equipped with two windows. The model included in the bundle heat exchanger delivery list includes two exchangeable tubular bundles of different geometries. The heating power and the volumetric flow can beadjusted. The heating power and the temperatures of the air and the heaterare displayed numerically. A pitot tube and a pressure measuring device make it possible to determine the speed distribution in front of and behind themodels.
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