急啊！！！版主和各位高手快来帮帮我啊！！！

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<P >　　版主及各位高手们，我要做的是模拟碳酸钙在壁面析出随着时间的变化规律，查了许多资料也没有找到相似的算例，我已经被卡<FONT face="Times New Roman">N</FONT>天了，请各位帮帮忙，看看有什么办法。<BR><FONT face="Times New Roman">　　问题描述：一圆管放于水浴槽内，管径为<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="0.02" UnitName="m">0.02m</st1:chmetcnv></FONT>，碳酸钙溶液在圆管内流动，溶液温度保持<FONT face="Times New Roman">37</FONT>度，流速保持<FONT face="Times New Roman"><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="0.2" UnitName="m">0.2m</st1:chmetcnv>/s</FONT>，管外为水浴，内有加热棒，持续加热，保证管壁温度保持<FONT face="Times New Roman">60</FONT>度不变，从而构成热交换系统，开始时管壁上没有碳酸钙析出，经过时间<FONT face="Times New Roman">t</FONT>后，由于管壁处温度高，会在管壁面上析出碳酸钙，随着析出的碳酸钙的厚度的增加，管径越来越小，从而使管壁处碳酸钙的沉积率，脱落率的变化，根据公式，进而又影响了沉积质量的变化，用公式<FONT face="Times New Roman">x<SUB>f</SUB>=M/</FONT>ρ知，析出的碳酸钙的又厚度增加了，这样就构成了迭代。如下面的流程图。我要做的是，模拟析出的碳酸钙的厚度的增加随着时间的变化规律。</P>

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[此贴子已经被作者于2006-5-29 19:33:13编辑过]

minipig_zh

这是问题的描述，还有我想请教一下，我想模拟的碳酸钙沉积中，我考虑碳酸钙沉积只是由于流体与壁面温度不同，所以溶解度不同，其它的不考虑，我想问，是不是不用两相流的模型，只用单相流模型就行了呢？谢谢你们的帮助！