کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
294914 511500 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An improvement to the simulation of phase-change heat-transfer during soil freezing and thawing
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
پیش نمایش صفحه اول مقاله
An improvement to the simulation of phase-change heat-transfer during soil freezing and thawing
چکیده انگلیسی

A new variable time step method, which is called the backwards calculating time step method, is presented in this paper. It allows numerical simulation of soil freezing and thawing while avoiding “phase change missing and overflowing”. A sensitive heat capacity model is introduced through which the calculation errors are analyzed. Then the equation using the self-adjusted time step is presented and solved using finite differences. Through this equation, the time needed for a space cell to reach the phase change point temperature is calculated. Using this time allows the time step to be adjusted so that errors caused by “phase change missing and overflowing” are successfully eliminated. Above all, the obvious features of this method are an accelerated rate for adjusting the time step and simplifing the computations. An actual example proves that this method can accurately calculate the temperature fields during soil freezing and thawing. It is an improvement over traditional methods and can be widely used on complicated multi-dimensional phase change problems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mining Science and Technology (China) - Volume 19, Issue 2, March 2009, Pages 262-268