| Summary: | In order to reveal the effect of channel orientations on rotational heat transfer performance, this paper presents an experimental model of AR = 4:1 smooth rectangular channel. The stationary and rotational heat transfer characteristics of the channel are studied in the range of Re = 10,000–40,000 and Ro = 0–1.23 under the channel orientation of 90° and 135°, which represent the basic one and realistic one, respectively. The experimental results indicate that for the trailing wall, the 90° channel shows a typical large range enhancement of rotational heat transfer, while the rotational effect becomes negative in most areas at 135° case. As the rotation number exceeds 0.7, the heat transfer of the trailing surface is greatly improved by rotational effect in 90° channel. When the channel was orientated at 135°, the leading surface heat transfer is more sensitive to rotation under the low rotation number (Ro < 0.3), and 20%–30% worse than non-rotating cases. The averaged Nusselt ratios correlations under the channel orientation of 90° and 135° have been developed for further engineering applications.
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