4.7 Free convection heat transfer is sometimes quantified by writing Equation 4.

Question

4.7 Free convection heat transfer is sometimes quantified by
writing Equation 4.20 as q conv? Skeff?T1?2, where keff is
an effective thermal conductivity. The ratio keff/k is greater
than unity because of fluid motion driven by buoyancy
forces, as represented by the dashed streamlines.

An experiment for the configuration shown yields a
heat transfer rate per unit length of q' conv? 110W/m for
surface temperatures of T1? 53°C and T2? 15°C,
respectively. For inner and outer cylinders of diameters
d = 20mm and D = 60mm, and an eccentricity factor
of z ? 10mm, determine the value of keff. The actual
thermal conductivity of the fluid is k ? 0.255W/m?K.

Explanation / Answer

4.7 Free convection heat transfer is sometimes quantified by writing Equation 4.

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