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This paper is presented to prepare and stability analysis of water-based ZrO2-TiO2 hybrid nanofluids. Recently, the research has significantly pointed out the thermophysical characteristics of nanofluids. Hence, the stability is connected with the hybrid nanofluid analysis in this investigation work. The study utilizes a two-step method for producing water-based ZrO2-TiO2 hybrid nanofluids. ZrO2-TiO2 nanofluids together with a ratio of 50:50 were developed to use a two-step technique at a volume concentration of 0.5 and 1%. The stability analysis of hybrid nanofluids is accomplished through visualization impact and UV-Vis spectrophotometry. The actual findings indicate the optimum volume concentration of ZrO2-TiO2 nanoparticles instability conditions further verified by UV-Vis spectrophotometry. The study’s final findings indicate that 1% of the volume concentration of ZrO2-TiO2 nanoparticles carries the most excellent homogeneity for over two weeks without any visible settling of contaminants in the colloidal suspension. The concentration of 1% obtains an optimum absorbance value is 4.0, which is the optimal homogeneity in the liquid. The concentration of 0.5% decreases dramatically until two weeks. However, it is also evident that the optimum blending ratio of ZrO2-TiO2 hybrid nanofluids has good stability. It will undoubtedly lead to further research on the thermal characteristics related to nanofluids. Eventually, it motivates technical engineers to concentrate on practical applications correlated with nanofluids.
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