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采用二步法制备溴化锂-碳纳米管(LiBr-CNT)纳米流体,并测试导热性、黏度等物性参数。设计组建了单管喷淋换热系统实验台,研究分析了喷淋密度、管间距以及CNT浓度等因素对纳米流体喷淋换热性能的影响。研究结果表明:管间距、喷淋密度、CNT浓度等因素对管外平均换热系数均有影响。在LiBr溶液中添加CNT纳米粒子,能显著地提高液体的导热、换热性能。该结果为纳米流体在喷淋换热领域的应用提供了重要的基础数据。
Lithium bromide - carbon nanotubes (LiBr - CNT) nanofluids were prepared by two - step method and their thermal conductivity, viscosity and other physical properties were tested. The single-tube spray heat exchanging system experimental bench was designed and developed. The effects of spray density, tube spacing and CNT concentration on the heat transfer performance of nanofluids were studied. The results show that: the tube spacing, spray density, CNT concentration and other factors have an impact on the average outside the tube heat transfer coefficient. Addition of CNT nanoparticles in LiBr solution can significantly improve the thermal conductivity and heat transfer performance of liquid. The results provide important basic data for the application of nanofluids in the spray heat transfer field.