Experimental investigation on underwater drag reduction using partial cavitation

Wang Bao¹, Wang Jiadao^{1, †}, Chen Darong¹, Sun Na^{1, 2}, Wang Tao^{1, 3}

(color online) Optical measurements of (a) the gas present in microgrooves modified with FAS-17 after immersion in water for 1 h and (b) the gas present in untreated hydrophilic microgrooves after immersion in water for 1 min.