CAJ | 학술논문

利用恒温浴槽对质量分数分别为5%、10%、15%、20%，纳米颗粒直径分别为50、100、500nm的Al2O3-H2O纳米流体进行冻结，分析了不同纳米流体在冻结过程中温度随时间的变化曲线，讨论了相同质量分数时，不同Al2O3粒径对冻结过程的影响。结果表明，在去离子水基液中加入Al2O3纳米颗粒缩短了冻结时间；且当质量分数分别为5%、10%、15%时，冻结时间均随纳米颗粒直径的增大而增加，粒径为50nm时，冻结时间最短，与去离子水相比分别缩短49.8%、51%、60%；当质量分数为20%时，冻结时间随Al2O3纳米颗粒直径的增大而减少，粒径为500nm时，冻结时间最短，与去离子水相比缩短54.8%。
이용항온욕조대질량분수분별위5%、10%、15%、20%，납미과립직경분별위50、100、500nm적Al2O3-H2O납미류체진행동결，분석료불동납미류체재동결과정중온도수시간적변화곡선，토론료상동질량분수시，불동Al2O3립경대동결과정적영향。결과표명，재거리자수기액중가입Al2O3납미과립축단료동결시간；차당질량분수분별위5%、10%、15%시，동결시간균수납미과립직경적증대이증가，립경위50nm시，동결시간최단，여거리자수상비분별축단49.8%、51%、60%；당질량분수위20%시，동결시간수Al2O3납미과립직경적증대이감소，립경위500nm시，동결시간최단，여거리자수상비축단54.8%。
A constant temperature bath was used to cool Al2O3-H2O nanofluids with different mass fractions of 5%, 10%, 15%, 20%and different particle sizes (50、100、500nm). By analyzing the curve of temperature changing with time in the process of freezing, the effects of different Al2O3 particle sizes on freezing process were studied. The results show that the Al2O3 nanoparticles added to aqueous solution of deionized water can reduce the time spent during the freezing process. When the mass fractions are 5%,10% and 15%, the freezing time increases with the diameters of nanoparticles increasing. And the time, compared with deionized water, is reduced by 49.8%, 51%, 60%respectively when the diameter of these nanoparticles is 50nm.When the mass fraction of Al2O3 nanoparticles is 20%, the time spent in this process decreases with the diameters of nanoparticles increasing, and it is shortest when the diameter is 500nm, which is reduced by 54.8%compared with deionized water.