Typical experiment of convection heat transfer in tubes is under the first or the second boundary condition.
典型的管内对流换热实验均在第一、第二类边界条件下进行。
The authors assume that the heat flux at the sliding surface of the lip occurs for the second boundary condition.
将唇口滑动而上的传热归结为第二类边界条件；
The first boundary condition, the second boundary condition and the third category boundary conditions would be very easy to introduce the algorithm without special treatment.
第一类边界条件、第二类边界条件和第三类边界条件很容易的引入该算法无需特殊处理。
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