As an active Heat Transfer Enhancement (HTE) measure for design and retrofit applications by injecting airflow into liquid stream, this experimental study examines the thermal performances of upward co-current air-water flow through a furrowed narrow channel with skewed wall waves and ribs. Superficial liquid Reynolds number (Re-L) and air-to-water mass flow ratio (AW), in the respective ranges of 800-6000 and 0-0.05, are selected as the controlling parameters to specify the flow conditions tested and to devise the heat-transfer and pressure-drop correlations. Even with the presence of multi-cellar vortices in this wavy ribbed channel, the modified drift flux model is still capable of correlating the channel-wise averaged void fractions to feature the equivalent dryness factors. The various patterns of gas-liquid flow structure imaged by the computerized high frame-rate videography reveal the Re-L and AW impacts on the air-water interfacial mechanics, which assist to illustrate the corresponding heat transfer and pressure drop properties. A set of selected full-field and area-averaged heat transfer data along with the pressure drop coefficients demonstrate the improved HTE impacts at the expense of increased pressure drop penalties by airflow injections. Empirical heat-transfer and pressure-drop correlations that permit the evaluation of individual and interdependent Re-L. and AW impacts on heat transfer and pressure drop coefficients are generated. With the scope of energy saving, Thermal Performance Factors (TPF) obtained at various Re-L and AW are compared with other HTE devices to enlighten the competitive advantage of this air-injection HTE measure for the present ribbed wavy channel. (C) 2012 Elsevier Ltd. All rights reserved.