TY - JOUR
T1 - Jet dynamics during vaporization of water drops in hot oil films
AU - Marston, Jeremy O.
AU - Li, Chao
N1 - Publisher Copyright:
© 2019 Elsevier Inc.
PY - 2019/12
Y1 - 2019/12
N2 - We experimentally investigate the vaporization of water droplets immersed in a hot oil film, with moderate temperaturedifferentials of 30–50 °C. In this regime, only a fraction of the water droplet vaporizes, but results in a symmetric vertical jet of oil. We provide detailed high-speed imaging of the physical process and quantitatively describe the vapor bubble growth, jet formation, jet speed and satellite droplets resulting from the jet break-up. The principal findings are that the jet speeds (vjet∼O(1) m/s) are inversely correlated to the oil film thickness (δ∼O(1) mm), whilst the surface tension-driven break-up results in primary satellite droplets whose normalized diameters also scale inversely with film thickness. Lastly, we provide observations of a water ‘peeling’ mechanism which occurs inside the vapor bubble, leading to a re-entrant jet that ultimately causes a secondary vaporization event.
AB - We experimentally investigate the vaporization of water droplets immersed in a hot oil film, with moderate temperaturedifferentials of 30–50 °C. In this regime, only a fraction of the water droplet vaporizes, but results in a symmetric vertical jet of oil. We provide detailed high-speed imaging of the physical process and quantitatively describe the vapor bubble growth, jet formation, jet speed and satellite droplets resulting from the jet break-up. The principal findings are that the jet speeds (vjet∼O(1) m/s) are inversely correlated to the oil film thickness (δ∼O(1) mm), whilst the surface tension-driven break-up results in primary satellite droplets whose normalized diameters also scale inversely with film thickness. Lastly, we provide observations of a water ‘peeling’ mechanism which occurs inside the vapor bubble, leading to a re-entrant jet that ultimately causes a secondary vaporization event.
KW - Liquid jets
KW - Vaporization
KW - Water peeling
KW - surface tension
UR - http://www.scopus.com/inward/record.url?scp=85069606077&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2019.109873
DO - 10.1016/j.expthermflusci.2019.109873
M3 - Article
AN - SCOPUS:85069606077
SN - 0894-1777
VL - 109
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
M1 - 109873
ER -