PRO 换热器中两相流给热系数计算方法选择？ 这是pro11软对两种计算方法的简介： the two-phase heat transfer coefficient may be determined by one of two methods; modified chen vaporization method (newly added), or hex5 method (existing method). these two methods differ in the calculation of boiling and condensing film coefficients. the modified chen vaporization method is the default method used by pro/ii and it includes predictions for sub-cooled and film boiling. condensation methods account for flow regimes and gravity versus shear effects. hex5 method is supported for the backward compatibility. the two phase heat transfer coefficient method is effective only when change occurs on either shell side or tube side or both sides. for the phase change case, the modified chen vaporization and hex5 methods will result in different heat transfer coefficients. for the no phase change case, both modified chen vaporization and hex5 methods will give the same heat transfer coefficients. 我觉得最好还是用专业换热计算软件计算有相变的情况。查看更多
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