Abstract
An experimental study has been performed in order to investigate the optimum rheological characteristics for a technique of heat transfer augmentation in a cavity between ribs mounted in parallel plates.The rheological characteristics of visco-elastic fluid were changed by controling the molar ratio of counter-ion to a cationic surfactant.Flow visuarization experiments and pressure loss measurements were conducted in this study.From the results,it was found flow penetration into the cavity occurred in the cases from 1 to 5 of molar ratio of counter-ions.The pressure loss was also found to become almost the same as that of water in the case when the molar ratio of counter-ions was set at 5.From this,it was concluded that the optimum fluid for the heat transfer augmentation in a cavity is required to have suitable elasticity and low viscosity as the molar ratio of counter-ions is set at 5.
