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Heat transfer and friction characteristics of the radial slit-finned heat exchangers under wet condition are experimentally investigated. Louver-finned heat exchangers are also tested for comparison purpose. The effect of fin pitch on j and f factor is negligible. Louver fin samples yield higher f factors than slit fin samples. For one row configuration, the average f factor ratio between slit fin sample and plain fin sample is 1.61, which decreases to 1.37 for two row configuration, and to 1.36 for three row configuration. As for the j factor, the ratios are approximately the same. The j factor increases as the number of tube row decreases. The f factor, however, is independent of the number of tube row. The j/f ratios of the slit fin are higher than those of louver fin. A new correlation is developed based on the present data.