 This instrument is designed to measure the total heat transfer (conduction + convection +
radiation) from the combusting flow to its front surface. The principle of the total heat
flux measurement is based on the measurement of the temperature gradient through a steel
plug of known thermal conductivity mounted at the tip of the probe. The total heat flux
meter consists of a central stainless steel plug surrounded by two guard rings of the same
material, cooled at the rear face only, so. that radial heat exchange is negligible. Two
Ni-NiCr thermocouples inserted inside the plug and separated by a known distance are used
to measure the axial temperature gradient within the plug. The conduction flux through the
plug is proportional to the time needed to reach steady state condition. The
proportionality constant can be determined by calibration of the total heat flux meter in
a blackbody furnace.
Since, in combusting flows,
conduction is negligible if compared to convection and radiation, the total heat flux
meter may serve to complement the information obtained using the ellipsoidal radiometer.
With measurements of the radiative heat flux (ellipsoidal) and total heat flux (total heat
flux meter) and a knowledge of the emissivity of the receiving surface of the latter
instrument, the convective contribution to the total heat transfer can easily be
determined. The range of operation and response of this meter is similar to that of the
ellipsoidal radiometer. The response time for this instrument is in the order of 10
minutes.
VENDOR: IFRF Research Station b.v.
Would you be interested in:
- getting more information about
this measurement equipment?
Please contact us:
IFRF Research Station B.V.
P.O. Box 10 000
1970 CA IJmuiden
The Netherlands
email: sales@ifrf.net
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