LOCAL ENDWALL HEAT/MASS TRANSFER IN A PIN FIN CHANNEL.
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The distribution of the local endwall heat/mass transfer coefficient in a channel with a staggered array (X/D equals S/D equals 2. 5) of pin fins was studied via the naphthalene sublimation technique. The length-to-diameter ratio was kept at 1. 0 and the Reynolds number ranged from 9,000 to 33,000. Results show that, near the leading edge, the heat/mass transfer coefficient decreases as a result of the growth of the boundary layer and then increases rapidly as the flow encounters the pins on the first and the second rows. The streamwise distributions of the heat/mass transfer coefficient downstream of the first pin row are nearly periodic - the corresponding transfer coefficient distributions have similar shapes although the magnitudes of the transfer coefficients at corresponding locations may vary. Downstream of the first pin row, the heat/mass transfer coefficient is generally very high immediately upstream of a pin and is relatively high in the wake region downstream of a pin.
