CAJ | 학술논문

利用UDF编程定义纳米流体相变源项，对Al2O3-H2O纳米流体在水平管内的沸腾过程进行了数值模拟，分析研究了纳米流体在水平管内沸腾的流型特点，结果表明水平管内沸腾蒸发产生的相变含气率沿着管长方向不断增加，但相同截面位置纳米流体的含气量高于纯水的含气量，有助于强化流体的扰动与混合。对于不同浓度的Al2O3-H2O纳米流体的流型研究表明：颗粒浓度对于纳米流体管内沸腾过程的影响不大。随后将纳米流体与纯水的流型进行比较，结果表明Al2O3-H2O纳米流体使得管内沸腾更剧烈，也更容易沸腾，这将改善水平圆管的流动特性。
이용UDF편정정의납미류체상변원항，대Al2O3-H2O납미류체재수평관내적비등과정진행료수치모의，분석연구료납미류체재수평관내비등적류형특점，결과표명수평관내비등증발산생적상변함기솔연착관장방향불단증가，단상동절면위치납미류체적함기량고우순수적함기량，유조우강화류체적우동여혼합。대우불동농도적Al2O3-H2O납미류체적류형연구표명：과립농도대우납미류체관내비등과정적영향불대。수후장납미류체여순수적류형진행비교，결과표명Al2O3-H2O납미류체사득관내비등경극렬，야경용역비등，저장개선수평원관적류동특성。
Programming through a UDF definition of nanofluid phase change source term , the Al2 O3 -H2 O nanofluid boiling process is simulated in the horizontal tube ,and the boiling flow pattern characteristics analyzed in the nanofluid horizontal tube .The results show that for boiling in the horizontal pipe , the gas content increases along the length direction , but in the same interface position , the nanofluid of air content is higher than that of pure water of air content ,helpful to enhance the disturbance of the fluid .For different concentrations of Al 2 O3 -H2 O nanofluid flow pattern , particle concentration has little effect on nanofluid tube boiling process .Nanofluid is then compared with pure water flow pattern , the results show that the Al 2 O3 -H2 O nanofluid makes tube boiling more intense and easier .It will improve the flow characteristic of the horizontal circular tube .