氧化铝纳米流体临界热流密度机理模型验证
|
摘要
针对现有纳米流体临界热流密度(CHF)在模型上存在的不足,考虑了接触角和毛细现象带来的影响,发展了针对氧化铝(Al_2O_3)纳米流体CHF的机理模型。本文利用多个Al_2O_3纳米流体实验与去离子水实验,对发展的CHF模型迚行了验证。验证结果表明:模型能较好地模拟Al_2O_3纳米流体CHF实验,改善了Kandlikar模型的不足,且模型可较好地模拟CHF随浓度变化的趋势,这是其余模型所不具备的新功能;模型也能较好地模拟去离子水CHF实验,与基于去离子水CHF实验得到的El-Genk和Guo模型相当,说明模型具有一定普适性。
To overcome the shortcomings of the present models, considering the contact angle and capillary wicking effects, an Al_2O_3 nanofluid critical heat flux(CHF) mechanism model has been developed. In this study, the developed CHF mechanism model is verified by several Al_2O_3 nanofluid and de-ionized water experiments. The verification shows that the present model can simulate the Al_2O_3 nanofluid experiments well, and overcome the shortcoming of the Kandlikar’s model. Also, this model can predict the trend of CHF versus nanofluid concentration, which is a new function that other models do not have. This model also can simulate the de-ionized water experiments well, and the calculated results are similar to the results calculated by El-Genk and Guo model based on de-ionized water CHF experiments, which means that the developed model has a wide applicability.
To overcome the shortcomings of the present models, considering the contact angle and capillary wicking effects, an Al_2O_3 nanofluid critical heat flux(CHF) mechanism model has been developed. In this study, the developed CHF mechanism model is verified by several Al_2O_3 nanofluid and de-ionized water experiments. The verification shows that the present model can simulate the Al_2O_3 nanofluid experiments well, and overcome the shortcoming of the Kandlikar’s model. Also, this model can predict the trend of CHF versus nanofluid concentration, which is a new function that other models do not have. This model also can simulate the de-ionized water experiments well, and the calculated results are similar to the results calculated by El-Genk and Guo model based on de-ionized water CHF experiments, which means that the developed model has a wide applicability.
引文
[1]何晓强,余红星,江光明.氧化铝纳米流体临界热流密度机理模型研究——物理模型[J].核动力工程,2018,39(3):162-165.
[2]CILOGLU D,BOLUKBASI A.A comprehensive review on pool boiling of nanofluids[J].Applied Thermal Engineering,2015,84:45-63.
[3]GOLUBOVIC M N,MADHAWA HETTIARACHCHIH D,WOREK W M.Nanofluids and critical heat flux,experimental and analytical study[J].Applied Thermal Engineering,2009,29:1281-1288.
[4]KANDLIKAR S G,STEINKE M E.Contact angles and interface behavior during rapid evaporation of liquid on a heated surface[J].International Journal of Heat and Mass Transfer,2002,45:3771-3780.
[5]PARK H M,JEONG Y H,HEO S.Effect of heater material and coolant additives on CHF for a downwardfacing curved surface[J].Nuclear Engineering and Design,2014,278:344-351.
[2]CILOGLU D,BOLUKBASI A.A comprehensive review on pool boiling of nanofluids[J].Applied Thermal Engineering,2015,84:45-63.
[3]GOLUBOVIC M N,MADHAWA HETTIARACHCHIH D,WOREK W M.Nanofluids and critical heat flux,experimental and analytical study[J].Applied Thermal Engineering,2009,29:1281-1288.
[4]KANDLIKAR S G,STEINKE M E.Contact angles and interface behavior during rapid evaporation of liquid on a heated surface[J].International Journal of Heat and Mass Transfer,2002,45:3771-3780.
[5]PARK H M,JEONG Y H,HEO S.Effect of heater material and coolant additives on CHF for a downwardfacing curved surface[J].Nuclear Engineering and Design,2014,278:344-351.