Peculiarities of the Leidenfrost effect application for drag force reduction

Abstract

An article presents the comparison of the energy consumption of the cold (at an ambient temperature) and hot (wrapped by the vapor film) spherical body, moving in the liquid (water and electrolyte FC-72). Taken in consid-eration that spherical body is from stainless steel with di-ameter 0.02 m. Body’s velocity was changed from 0.03 to 32.5 m/s; liquid and cold body temperature was kept at 20°C; hot body temperature was equal to 500°C. During the analysis was stated that the hot body, surrounded by the vapor film, moves faster, but from the energy economy view, boiling crisis (Leidenfrost effect) application in order to reduce drag force of the moving body, is reasonable in the case of electrolyte, but is doubtful for the water case. DOI: http://dx.doi.org/10.5755/j01.mech.20.3.6775