Drag reduction characteristics of heated spheres falling into water*

Project supported by the National Natural Science Foundation of China (Grant No. 11672094).

Li Jia-Chuan, Wei Ying-Jie, Wang Cong, Xia Wei-Xue
       

(color online) Falling velocity of the sphere varying with falling time at Tw = 25 °C and Ts = 25 °C, with black points representing experimental values obtained by the video clips and red line denoting fitted curve from formula V(t) = VT (1et/τ).