[请教]：热分析中的界面热阻应该如何加？

ParkerZeng

是不是也象对流换热系数那样：sf,all,conv,100,20 ？
   还是应该：sf,all,conv,-100,20 ？

gus1977

呵呵，可以和对流一样加，没有必要设成负的

ParkerZeng

谢谢gus1977版主！

lxthit

其实可以设置界面热阻单元来实现！

mmmhhhkkk

是不是就是把结合面的导热系数用convection设置在结合面上呢？那是设置接触的两个面还是就是只设置在一个面上就可以了呢？
接触热阻是不是试验可以测出来呢？
恳请版主答复，本人qq35380363，现在也正在为这个问题困惑，请详细赐教！

iomega

In anays, there are two ways to have  thermal contact resistance:
(1) make one very thin layer sandwiched between the two materials and set its thermal conductivity k = d/Rth, where d is the thin layer thickness and Rth is the thermal resistance value with unit of m^2*K/W. If you are doing transient analysis, also set specific heat close to 0 (you may ask youself why).

(2) you can use contact element to make thermal contact resistance. See ANSYS online help. Note, it use the thermal contact conductance = 1/Rth.

Some comments are shown below:

原帖由 mmmhhhkkk 于 2007-3-12 16:07 发表
是不是就是把结合面的导热系数用convection设置在结合面上呢？
Please think carefully. You are confused from physics.   导热系数 and convection coefficient have different units so your argument is wrong even from the physics.

那是设置接触的两个面还是就是只设置在一个面上就可以了呢？
接触热阻是不是试验可以测出来呢？
Yes, it is usually experimentally measured - some typpical vaule: the thermal contact resistance between thermal paste and CPU is around ~10e-5 to 10e-4 m^2-K/W , roughly equal to the thermal resistance of 1mm silicon layer.

恳请版主答复，本人qq35380363，现在也正在为这个问 ...

mmmhhhkkk

contact element怎么设置呢，我在两个接触物体中间设置了一个面，面上加载了接触面的当量热导率（w/m.c），可两个面之间不传热了，你有qq吗，我迫切的想知道如何设置，祈盼！

mmmhhhkkk

我用了contact单元做热阻分析，看参考资料好像只有contac48，contac49能做接触热分析，可我从contact单元里找不到这两个单元呀，请问版主这两个单元在哪里呢？我用的是ansys9.0，盗版的