Modeling and optimization of thermal conductivity of synthesized MWCNT/water nanofluids using response surface methodology for heat transfer applications
Faisal Masood, Mohammad Azad Alam, Nursyarizal Bin Mohd Nor, Kashif Irshad, Irraivan Elamvazuthi, Shafiqur Rehman, Javed Akhter, Mohamed E. Zayed
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引用次数: 0
Abstract
This paper reports on the experimental examination and optimization of a response surface methodology (RSM)-based predictive model for the thermal conductivity of aqueous multi-walled carbon nanotube (MWCNT)-based nanofluids for heat transfer applications. The design matrix was created with nanofluid temperature (°C) and nanoparticle concentration (mass/%) as independent variables, while thermal conductivity was considered as a response variable. Magnetic stirring and ultrasonication were used to produce nanofluid samples. The thermal conductivity of the prepared samples was measured, and quadratic models were selected through regression analysis. ANOVA was performed to validate the models. The maximum thermal conductivity value, i.e., 0.988 W m−1 K−1, was achieved at MWCNT particle content 0.5 mass/% and 60 °C temperature. A comprehensive optimization study was also performed for maximizing thermal conductivity. The optimal values for the thermal conductivity of nanofluids were found to be 0.8845 W m−1 K−1, whereas the optimal values for the control factors, i.e., nanofluid temperature and nanoparticles' concentration, were estimated to be 60 °C and 0.5 mass/%, respectively. The coefficient of determination R2 for the thermal conductivity of the developed model was found to be 0.9866, which confirmed the suitability of the developed models. The optimized MWCNT/water nanofluid shows potential as an effective heat transfer fluid, particularly for solar thermal and hybrid photovoltaic/thermal applications.
本文报道了基于响应面法(RSM)的水相多壁碳纳米管(MWCNT)纳米流体导热率预测模型的实验检验和优化。设计矩阵以纳米流体温度(°C)和纳米颗粒浓度(质量/%)为自变量,导热系数作为响应变量。采用磁力搅拌和超声技术制备纳米流体样品。对制备的样品的导热系数进行了测量,并通过回归分析选择了二次模型。采用方差分析对模型进行验证。当MWCNT颗粒含量为0.5质量/%,温度为60℃时,其导热系数最大,为0.988 W m−1 K−1。同时进行了导热系数最大化的综合优化研究。纳米流体导热系数的最佳值为0.8845 W m−1 K−1,而控制因素(即纳米流体温度和纳米颗粒浓度)的最佳值分别为60°C和0.5质量/%。所建模型的导热系数决定系数R2为0.9866,证实了所建模型的适用性。优化后的MWCNT/水纳米流体显示出作为有效传热流体的潜力,特别是在太阳能热和光伏/热混合应用中。
期刊介绍:
Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews.
The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.