研究目的
To investigate the variations of thermal conductivity and electrical conductivity of water - solar glycol mixture based MWCNT nanofluids at different working temperatures.
研究成果
The study demonstrated that MWCNT nanofluids in a solar glycol-water mixture significantly enhance thermal and electrical conductivity, with maximum enhancements of 21.46% and 62.19% respectively at 0.6 vol.% MWCNT concentration and 50°C. The nanofluids showed good colloidal stability for up to 10 days, making them suitable for various heat transfer applications.
研究不足
The study focused on a limited range of MWCNT concentrations (0.2% to 0.6%) and temperatures (30°C to 50°C). The stability of nanofluids was assessed over a short period (15 days), and long-term stability was not investigated.
1：Experimental Design and Method Selection:
The study used a typical two-step methodology for preparing nanofluids with MWCNTs dispersed in a solar glycol-water mixture. Gum Arabic was used as a surfactant to ensure stability.
2：Sample Selection and Data Sources:
MWCNTs were purchased from Cheap Tubes, USA, and solar glycol was procured from Dynalene, USA.
3：List of Experimental Equipment and Materials:
Equipment included a UV-vis spectrometer, zeta potential analyser, scanning electron microscopy, pH metre, KD2 Pro thermal analyser, and a 4-Cell conductivity electrode metre (PICO+).
4：Experimental Procedures and Operational Workflow:
Nanofluids were prepared with different volume concentrations of MWCNTs (
5：2%, 4%, 6%). Stability was assessed using UV-vis spectroscopy, zeta potential analysis, SEM, and pH measurement. Thermal and electrical conductivity were measured at temperatures ranging from 30°C to 50°C. Data Analysis Methods:
Thermal conductivity was compared with existing correlations (Hamilton and Crosser, Wasp, Yu and Choi, Timefeeva). Electrical conductivity was measured directly with the PICO+ metre.
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