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Abstract:
We present a series of measurements of the friction factor and the
forces convection heat transfer coefficient in 2D mini-channels of 1.12
mm to 300 mum in thickness. The friction factor is estimated from the
measurement of the pressure drop along the whole channel. The heat
transfer coefficient is determined from a local and direct measurement
of the temperature and the heat flux at the wall by means of a specific
transducer. The experimental results do not lead to question the
validity of the classical correlations obtained on ducts of larger
size. The numerical simulations have shown that the deviations observed
from the classical laws for both the friction factor and the Nusselt
number are mainly due to macroscopic effects as entrance effects or the
lack of uniformity of the surface heat flux.
