Prandtl number of optimum biodiesel from food industrial waste oil and diesel fuel blend for diesel engine

•ANN provided a higher predicted yield for food industrial waste oil methyl ester (FIWOME) compared to RSM.•Correlations for the specific heat capacity (Cp), thermal diffusivity (TD) and thermal conductivity (TC) of FIWOME established for the first time.•The Cp and TD are correlated with FIWOME percent through the least square regression.•The TC was correlated with the FIWOME fraction through linear regressions.•The major properties of FIWOME concurred agreed with previous studies and compiled with biodiesel standards.•The performance of B22.5 gave a good improvement in term of BTE.