CAJ | 학술논문

提出了双层微通道热沉两种新的流动方式，逆流 CB-DL（逆流 B 形式）与逆流 CC-DL（逆流 C 形式），并用数值模拟的方法研究这两种流动方式对热沉整体温度分布及传热性能的影响。结果表明：与流动方式顺流 P-DL 与逆流 CA-DL 对比，采用CB-DL 流动方式时，热沉底面温度先升高后下降，温度最高点集中在热沉的中部，温度分布相对均匀；而且当泵功 PP ＞0．05 W时，与其他入口流动方式对比，采用逆流 CB-DL 的底面温差及热阻最小，这是由逆流 CB-DL 的流动特点决定的，当流体流入上层通道时，由于上层流体带走的热量小于下层的，流体受热温度稍微提高，这时上层受热温度升高的流体流入下层，减小了下层流体的入口温度与底面温度的温差，因而有效地减少流体与底面温度的不可逆损失，从的角度说明有效提高了热能的利用率。
제출료쌍층미통도열침량충신적류동방식，역류 CB-DL（역류 B 형식）여역류 CC-DL（역류 C 형식），병용수치모의적방법연구저량충류동방식대열침정체온도분포급전열성능적영향。결과표명：여류동방식순류 P-DL 여역류 CA-DL 대비，채용CB-DL 류동방식시，열침저면온도선승고후하강，온도최고점집중재열침적중부，온도분포상대균균；이차당빙공 PP ＞0．05 W시，여기타입구류동방식대비，채용역류 CB-DL 적저면온차급열조최소，저시유역류 CB-DL 적류동특점결정적，당류체류입상층통도시，유우상층류체대주적열량소우하층적，류체수열온도초미제고，저시상층수열온도승고적류체류입하층，감소료하층류체적입구온도여저면온도적온차，인이유효지감소류체여저면온도적불가역손실，종적각도설명유효제고료열능적이용솔。
To study the heat transfer performance of enhanced heat transfer process in microchannel heat sinks,two novel flow manners of a double-layer micro heat sink are presented,i.e.,counter flow CB-DL and CC-DL.The effect of total temperature distribution and heat transfer performance on them is investigated numerically.Results show that for counter flow CB-DL,the bottom temperature increases firstly and then decrease along the flow direction,thus the maximum temperature is located at the middle of the heat sink.Compared with flow manners,the temperature difference and thermal resistance are minimum when PP<0.05 W.The reason is that the lower-layer microchannel can remove more heat than the upper-layer microchannel,thus resul-ting in a little temperature rise of the lower-layer fluid.This can help to reduce the temperature difference between the inlet tem-perature of the lower-layer fluid and the bottom temperature,thereby helping to decrease the irreversibility caused by fluid flow and the bottom temperature.Form the view point of exergy,it is favorable to improve the utilization of heat.