在面上施加的生热率，是咋样的物理意义？

iomega

(3) is the correct answer.
If you apply hgen = 10 W/m^3 on an area A (m^2), it assume the depth in z direction is 1m, and the heat generated in this volume V= A*1m is  hgen *V = 10*A (W), of course the z direction is assumed to be adiabatic condition...

The unit of hgen is always W/m^3, no matter apply on volume, area or line.

The unit of hflux is always W/m^2, no matter apply on area or line.

>生热率（HeatGenerationRate）：生热率既可用作材料属性赋予材料，又可用作体载荷施加到单元上，用以模拟化学反应或电流生热，其单位是单位体积的热流率.

The explaination is wrong -> 热流率 = hflux (W/m^2)

based on the sentence, the hgen will be hflux/V = W/m^5!!!