太阳辐射影响下旋转石墨烯纳米流体的加热和蒸发研究

IF 0.9 Q4 ENERGY & FUELS
K. T. Chan, A. S. Dmitriev, I. A. Mikhailova, P. G. Makarov
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引用次数: 0

摘要

将太阳辐射转化为蒸汽是目前 "绿色 "能源(太阳热能)、生态学和清洁水生产的趋势之一。该研究首次对旋转石墨烯纳米流体在太阳模拟器辐射影响下的加热和蒸发过程进行了研究。研究考虑了各种因素对这些过程的影响,包括辐照方向、石墨烯浓度和液体旋转速度。结果表明,蒸发率在很大程度上取决于石墨烯浓度和样品的辐照方式。当样品从侧面照射时,随着石墨烯浓度的增加,平均蒸发率会增加并达到最大值,然后降低。当样品从上方照射,且液气界面直接接触入射辐射时,随着石墨烯浓度的增加,蒸发率只会下降。在这种情况下,石墨烯的加热也取决于照射样品的方法。与辐射直接接触时,石墨烯会被加热到很高的温度,而散装石墨烯的加热效率要低于基液(蒸馏水)。研究表明,旋转的石墨烯纳米流体表面的蒸发率及其体积温度与旋转速度有很大关系。在所有研究样品中,体积浓度为 0.5% 的石墨烯纳米流体的加热效率最高。使用隔热材料可将加热效率提高约 5%。本文介绍了界面表面轮廓的分析计算方法,并确定了液体以不同速度旋转时的界面面积。确定了石墨烯纳米流体旋转过程中产生的一些效应及其对流体力学、传热和传质参数的影响,这对基础和应用能源问题非常重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Study of Heating and Evaporation of Rotating Graphene Nanofluid under the Influence of Solar Radiation

Study of Heating and Evaporation of Rotating Graphene Nanofluid under the Influence of Solar Radiation

Study of Heating and Evaporation of Rotating Graphene Nanofluid under the Influence of Solar Radiation

Conversion of solar radiation into steam is presently one of the trends in “green” energy (solar thermal energy), ecology, and clean water production. For the first time, a study of the heating and evaporation of a rotating graphene nanofluid under the influence of radiation from a solar simulator was carried out. The influence of various factors on these processes, including the direction of irradiation, graphene concentration, and liquid rotation speed, is considered. It has been shown that the evaporation rate significantly depends on the graphene concentration and the method of irradiation of the samples. When samples are irradiated from the side, as the graphene concentration increases, the average evaporation rate increases and reaches a maximum value and then decreases. When samples are irradiated from above and the liquid–air interface is in direct contact with the incident radiation, only a decrease in the evaporation rate is observed as the graphene concentration increases. In this case, heating of graphene also depends on the method of irradiating the sample. When in direct contact with radiation, graphene is heated to a high temperature, while in the bulk it is heated less efficiently than the base liquid (distilled water). It has been shown that the rate of evaporation from the surface of a rotating graphene nanofluid and the temperature of its volume significantly depend on the rotation speed. Of all the samples studied, a graphene nanofluid with a volume concentration of 0.5% is heated most efficiently. The use of thermal insulation can improve heating by approximately 5%. An analytical calculation of the profile of the interfacial surface is presented and its area is determined at different speeds of rotation of the liquid. Some effects that arise during the rotation of a graphene nanofluid and their influence on the parameters of hydrodynamics and heat and mass transfer, which is important for fundamental and applied energy problems, have been identified.

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来源期刊
CiteScore
1.30
自引率
20.00%
发文量
94
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