能源研究与信息
能源研究與信息
능원연구여신식
ENERGY RESEARCH AND INFORMATION
2014年
4期
235-240
,共6页
微通道%流动沸腾换热%干度%换热关联式%模型
微通道%流動沸騰換熱%榦度%換熱關聯式%模型
미통도%류동비등환열%간도%환열관련식%모형
microchannel%flow boiling heat transfer%dryness%heat transfer correlation%model
对国内外微通道流动和换热的研究实验作了总结，阐述了影响微通道换热系数的因素，如热流密度、过热度和干度等．对去离子水在内径为0．65 mm、长为102 mm 的圆形管道内流动沸腾换热进行了实验研究，得到了局部换热系数随干度的变化关系，进而根据换热系数的变化趋势讨论了饱和流动沸腾区微通道内主导的换热机制．结果表明：从换热系数随干度的变化关系很难判定主导的换热机制；将实验数据与已发表的预测关联式进行了比较，发现大多关联式都失效，说明基于常规理论的模型不再适用于微通道．
對國內外微通道流動和換熱的研究實驗作瞭總結，闡述瞭影響微通道換熱繫數的因素，如熱流密度、過熱度和榦度等．對去離子水在內徑為0．65 mm、長為102 mm 的圓形管道內流動沸騰換熱進行瞭實驗研究，得到瞭跼部換熱繫數隨榦度的變化關繫，進而根據換熱繫數的變化趨勢討論瞭飽和流動沸騰區微通道內主導的換熱機製．結果錶明：從換熱繫數隨榦度的變化關繫很難判定主導的換熱機製；將實驗數據與已髮錶的預測關聯式進行瞭比較，髮現大多關聯式都失效，說明基于常規理論的模型不再適用于微通道．
대국내외미통도류동화환열적연구실험작료총결，천술료영향미통도환열계수적인소，여열류밀도、과열도화간도등．대거리자수재내경위0．65 mm、장위102 mm 적원형관도내류동비등환열진행료실험연구，득도료국부환열계수수간도적변화관계，진이근거환열계수적변화추세토론료포화류동비등구미통도내주도적환열궤제．결과표명：종환열계수수간도적변화관계흔난판정주도적환열궤제；장실험수거여이발표적예측관련식진행료비교，발현대다관련식도실효，설명기우상규이론적모형불재괄용우미통도．
The studies of flow boiling heat transfer in a microchannel at home and abroad are summarized,as well as the factors that influence the heat transfer coefficient,such as heat flux density,degree of superheat and dryness.Experimental and theoretical analysis of flow boiling heat transfer in the microchannel with a diameter of 0.65 mm and a length of 102 mm were carried out to obtain the relationship between the local heat transfer coefficient and dryness.And the dominated heat transfer mechanism at saturated flow boiling region in the microchannel was discussed according to the variation of heat transfer coefficient.The results show that it is difficult to determine the dominated heat transfer mechanism from the relationship between heat transfer coefficient and dryness.The comparison between the experimental data and the published predictive correlations is made,and most of the correlations can’t predict the experimental data well.It is concluded that the models based on conventional theories are no longer suitable for the microchannel.
