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An experimental program has been conducted to evaluate the thermal performance, the relationship between surface heat flux and surface temperature, of two engine coolants at off-design operating conditions. These conditions could be caused by high ambient temperature or a faulty system seal. The experimental data shows that system pressure has the most pronounced effect on thermal performance. Lowering the system pressure enhances boiling by reducing the saturation temperature. Using a revised Chen correlation, analytical predictions have been obtained which agree with the experimental results

Test results have been obtained on the thermal performance of aqueous mixtures of propylene-glycol and ethylene-glycol for conditions simulating automotive engine operation. For the present study, thermal performance is defined as the test section surface temperature for a given set of operating conditions. In addition to testing over a wide range of surface heat fluxes up to 2.3 MW/m2, data were also obtained at different mixture concentrations. For all cases considered, both coolant mixtures provided similar results.