Abstract
This paper presents an experimental study of microscopic explosive boiling introduced by a pulsed laser. The violent explosive boiling was observed in the liquid film, and the vapor bubbles together with liquid droplets were expelled from the platinum film. It is found that the apparent bubble nucleation temperature is a strong function of the heating rate. The pressure signal appears as continuous oscillation and is intensified as laser power density increases.
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Abbreviations
- a :
-
scale index
- A :
-
coefficient
- b :
-
position index
- B :
-
coefficient
- C :
-
coefficient
- D :
-
coefficient
- g(t):
-
generic time function
- J ho :
-
homogeneous nucleation rate of superheated liquid (nuclei/m3 s1)
- k b :
-
Boltzmann constant
- m :
-
mass of the liquid molecule (kg)
- N l :
-
molecule number of per volume liquid (molecule/m3)
- P v :
-
pressure inside bubble (Pa)
- P l :
-
ambient liquid pressure (Pa)
- P c :
-
critical pressure of liquid (Pa)
- P atm :
-
standard atmospheric pressure (Pa)
- t :
-
time (s)
- T l :
-
the liquid temperature (K)
- T b :
-
the normal boiling point (K)
- Wg (a, b) :
-
continuous wavelet transform coefficient, \( W_{{\text{g}}} (a,b) = {\int\limits_t {g(t)\psi _{{{\text{a}},{\text{b}}}} (t){\text{d}}t} } \)
- ψ a,b (t) :
-
wavelet functions, \( \psi _{{{\text{a}},{\text{b}}}} (t) = \frac{1} {{{\sqrt a }}}\psi (t - b/a) \)
- σ :
-
surface tension of the liquid (N/m)
- σ b :
-
the liquid surface tension at normal boiling point (N/m)
- ρ lb :
-
the liquid density at normal boiling point (kg/m3)
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Acknowledgments
This research is supported by National Natural Science Foundation of China (50576099), the Chinese National Key Foundation Research Subject (No. 2006AA05Z203), and The project of Chinese Academy of Sciences (Y2005009).
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Huai, X., Wang, G., Jin, R. et al. Microscopic explosive boiling induced by a pulsed-laser irradiation. Heat Mass Transfer 45, 117–126 (2008). https://doi.org/10.1007/s00231-008-0400-x
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DOI: https://doi.org/10.1007/s00231-008-0400-x