Abstract
Flow visualization experiments have been performed in order to find the optimal geometric condition of heat transfer augmentation method using viscoelastic fluid instead of Newtonian fl uid for a cavity flow. In the experiments, rib height was kept constant and rib width was changed in three steps. From the results, when rib length is short, the viscoelastic fluid is found to penetrat deeply in cavities between ribs by Barus effect. In these conditions, the recirculating region observed in cavity flow of water system effectively reduces. Then, short-rib system can be expected to be effective for heat transfer augmentation in cavities between ribs.
