Cavitation history effect of a water-metal Berthelot tube system interpreted by an elaborated gas-trapping crevice model

摘要: A stainless steel container, filled with 1 g of water and sealed a copper plug, was repeatedly heated cooled over an appropriate temperature range (temperature cycles). Negative pressures, although scattered, increased cycle repetition through two stages. The cavitation history effect persisted for continued cycles after renewal only the water. authors found efficient means raising negative pressure by effect: (i) high rate conditioning (ii) using sealing metal melted cast under vacuum. Aided these means, raised to -87 bar at 49 degrees C 392 repeated period one week, while maximum value -76 46 attained total 850 month. results can be interpreted gas-trapping crevice model supplemented working assumption that crevices on surface are supplied gas from sources in bulk. more recent -125 47 C, highest ever reported tube, supports assumption.