Water in diesel nano-emulsion (WiDNE) due to theirnano size, kinetically stable gives its beneficial in commercial andenvironmental aspects. However, the capability of this fuel strongly depends onthe method of preparation, stability and their physic-chemical properties.Central composite design (CCD) method was used to optimize variableinteractions in order to obtain maximum stability. Methodology RSM method withsix independent variables was selected in order to understand the impacts ondroplet size. The response surface and 3D plots of the quadratic polynomialmodel were created for studying the combination effect on response. Dynamiclight scattering DLS technique was used for measuring of droplet sizes. Theanalysis result by ANOVA was with 95% confidence displaying F value model was52.82. The results displayed model was fulfilled with the assumptions of ANOVA.This study has relied on Design Expert software to locate the optimum dropletsize situations. The measured diameter is 26 nm, with 0.0297 errors betweenactual conditions and measured value. The optimum blend properties of prepared WiDNE fuel were compared with conventional diesel.Improvements in physical properties were observed in presence of waterin WiDNE.
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