好的散熱體一定要傳導快嗎??

Question

好的散熱體一定要傳導快嗎??

水雖然有一個高的specific high capacity，但佢是一個差傳導，點解佢係一個好的散熱體??

空氣都一樣是差傳導，同有一個高的specific high capacity，點解唔同水，唔係一個好的散熱體??

Specific heat capacity 同傳導的快慢點解冇關係?水高specific heat capacity 時，佢咪要慢D 熱，佢 慢D 熱，傳導咪慢lor??

Answer 1

好既散熱體要有兩個特質:SHC高同傳導快
所以最好既散熱體係SHC高既金屬
但係點解會有人用水做散熱體?
1.Common,邊都有,而且平
2.係流體,可以不斷更換,吸左熱既水可以好快流走比新既低溫水入黎
(同風扇散熱)

Answer 2

It all depend on which heat transfer process (namely conduction, convection and radiation) is dominant in the cooling process.

Water and air is good in removing heat when they act as a medium in the convection process. The high specific heat and mobility of the substance are important in effective convection. This happens in car radiator (where circulation of water is used) or in the cooling fins in CPUs in computer (where forced convection of air is employed).

If conduction is used as a major process in removing heat, surely materials with high conductivity are used, and the specific heat capacity of the material is generally not a matter of concern.