自由分子領域における蒸発のモーメント法--時間積分に対するセンシティビティー A Moment Method for Evaporation in the Free Molecular Regime : Sensitivity to Time-Integration Scheme
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A moment method of the log-normal distribution is applied to evaporation of particles by introducing correction factors calculated from the error function. In the free-molecular regime, the improved moment method is tested for the evaporation and the sensitivity to time-integration scheme is examined. For the forward and backward Euler solutions, small time step size (<1 s for d<I>v</I>/d<I>t</I> = -10<SUP>-10</SUP><I>v</I><SUP>2/3</SUP>, where <I>v</I> is the particle volume and <I>t</I> is time) is required to accurately simulate the evaporation, since the difference from the exact one becomes larger with increasing the time step size. For large time step size (∼10 s) , the fourth order Runge-Kutta and simple exponential solutions agree well with the exact solution of the evaporation in the free molecular regime.
- Earozoru Kenkyu
Earozoru Kenkyu 22(1), 41-47, 2007-03-20
Japan Association of Aerosol Science and Technology