Combined effect of increase in exit blade angle and surface roughness shows an in increase in head with negligible increase in efficiency.
Effects of exit blade angle and surface roughness on the centrifugal pump impeller performance at different mass flow rates have been evaluated by numerical simulations for water, crude oil, saline-water gasoline and kerosene.
Thus, the purpose of the present study is to investigate the combined effect of blade angles and surface roughness on impeller performance by numerical simulation for crude oil, kerosene, gasoline, saline-water, and water at different flow rates.
The results show that the velocity coefficient is relatively sensitive to both blade height and surface roughness while almost independent of expansion ratio, mainly due to the high Reynolds number and the small flow boundary layer when using refrigerant vapor.
In order to prevent possible sample-to-sample contamination, both the microtome blade and working surface were cleaned of tissue and/or paraffin parts and decontaminated using DNA Away™ solution (DNA Away Surface Decontaminant Thermo Fisher Scientific Incc, Waltham, MA, USA) after each use.
The blade and working surfaces of the cryotome were cleaned with methanol immediately prior to cutting and at no time did the blade come into contact with OCT.
And the microscopic distance between the blades and the surface might be hard to maintain (or keep clean).
We measured the liquid temperatures near the heater, impeller blades and free surface.
Up on inspection the surface of each suspected lung was incised using sterile scalpel blade and the inner surface of the incision was sampled with sterile swab.
The effects of outlet blade angle, solidity, blade height, expansion ratio, and surface roughness, on the stator velocity coefficient are evaluated by a verified 3-D viscous numerical modeling.
