Bearing vibration during cold starting has now been remarkably mitigated by readjusting gland clearances and coupling alignment, herewith preventing the occurrence of radial gland rubbing.

The effects of gap size, heat flux and inlet subcooling on the boiling incipience, flow pattern, heat transfer coefficient, flow instability and critical heat flux were analyzed and discussed.

The results of experimental study of flow pattern in the end clearance of guide-vane of water-turbine by means of visualization are presented in this paper.