Abstract
Heat transfer characteristics have been measured around an outer rod of a 37-rod bundle model, in which localized heat was provided by a narrow heated strip. The rod was traversed perpendicularly to its axis and rotated about itself, thus permitting measurement of the local heat transfer coefficient around its perimeter for various rod-wall proximities, including cases with narrow rod-wall gaps, rod-wall contact and rod-rod-wall contact. The measurements show that the heat transfer coefficient was minimum near narrow gaps and maximum in open-flow regions but its variation became substantial only when the gap diminished below a certain value. In-flow mean temperature and temperature fluctuation measurements were also conducted in the subchannel adjacent to the heater. Asymmetries of the mean temperature and the temperature fluctuation contours were observed with the heater near the gap as well as facing the subchannel centre.
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