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Study of heat transfer during evaporation and boiling of thin horizontal layers

Ranges of heat transfer coefficients attainable for different coolants with natural convection, single-phase liquid forced convection, and boiling

Слайды и текст этой презентации

Слайд 1Study of heat transfer during evaporation and boiling of thin

horizontal layers of liquid on a modified surface

Study of heat transfer during evaporation and boiling of thin horizontal layers of liquid on a modified

Слайд 2Ranges of heat transfer coefficients attainable for different coolants with

natural convection, single-phase liquid forced convection, and boiling

Ranges of heat transfer coefficients attainable for different coolants with natural convection, single-phase liquid forced convection, and

Слайд 3Johann Gottlob Leidenfrost
The Leidenfrost effect 
1756

Johann Gottlob LeidenfrostThe Leidenfrost effect 1756

Слайд 41950
1965
1934
Pool boiling curve (Nukiyama)
Schemes of vapor structures (Gaertner)
The dependence of

Kutateladze for CHF
1952
The Rohsenow pool-boiling correlation

195019651934Pool boiling curve (Nukiyama)Schemes of vapor structures (Gaertner)The dependence of Kutateladze for CHF1952The Rohsenow pool-boiling correlation

Слайд 5Successive stages of growth of two bubbles at boiling of

nitrogen in the film
1977
Photographs of the structures observed in a

thin oil layer: (1) intersection of filaments in the area of convection cells where funnels are formed (the funnels are shown by arrows); (2) simultaneous formation of two funnels in the same place, 1 - cm scale; (3) funnels on the surface of horizontal layer of mineral vacuum oil spaced from each other at a distance of about critical wavelength of Rayleigh–Taylor instability, 1 - cm scale; (4) crater in the oil layer, marked by a cross, 1 - cm scale

1989

2013

The dynamics of the «crater» formation

Successive stages of growth of two bubbles at boiling of nitrogen in the film1977Photographs of the structures

Слайд 6Map of hydrodynamic regimes of evaporation and boiling of the

n-dodecane layer height h = 2,5 mm:
1 – bubbles,

2 – «craters», 3 – «funnels», 4 – «funnels» + «craters», 5 – convection, 6 – the Dependence of Kutateladze, 7 – calculation by Yagov formula, 8 – calculation by Landau formula

2016

«Funnels» + «craters»

The crisis of evaporation

Map of hydrodynamic regimes of evaporation and boiling of the n-dodecane layer height h = 2,5 mm:

Слайд 7side view
front view
2006
2009
Pool boiling curve with PF-5060 of enhanced structured,

adapted from Im et. al. (2012)
2018

side viewfront view20062009Pool boiling curve with PF-5060 of enhanced structured, adapted from Im et. al. (2012)2018

Слайд 8Thanks for your attention!

Thanks for your attention!

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