Typical experiment of convection heat transfer in tubes is under the first or the secondboundarycondition.
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。
2
The authors assume that the heat flux at the sliding surface of the lip occurs for the secondboundarycondition.
将唇口滑动而上的传热归结为第二类边界条件；
3
The first boundarycondition, the secondboundarycondition and the third category boundary conditions would be very easy to introduce the algorithm without special treatment.