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Radial-Flow Gas Turbines
Published in Bijay K. Sultanian, Logan's Turbomachinery, 2019
Three additional radial-flow turbines should be mentioned. The Francis-type hydraulic turbine was first developed in 1847 and is, at present, widely used in various sizes up to 600 MW in hydraulic power plants. It is very similar in geometry to the gas turbine described in the present chapter, but it makes use of water as the flowing fluid. Hydraulic turbines are discussed in Chapter 10. The Tesla turbine, which was invented in 1911 by Nikola Tesla, is a vaneless form of a radial-inflow turbine that gains its motive force from fluid friction acting on closely spaced disks mounted on a shaft. Rice (1991) presents a critical discussion of recent research on this potentially useful machine. The Ljungstroem turbine, discussed by Shepherd (1956) and Dixon and Hall (2014), is a radial-outflow turbine that has been widely used in steam power plants.
Variable thermal applications of radiative micropolar nanofluid solutal boundary conditions
Published in Waves in Random and Complex Media, 2022
M. Ijaz Khan, Sami Ullah Khan, Sharifah E. Alhazmi, Maha M. Helmi, Essam Roshdy El-Zahar, M. Y. Malik
This investigation deals with the thermal developed flow of micropolar nanofluid with applications of bioconvection due to off-centered disks. The thermal model is further modified by using the variable thermal consequences. The significances of modified Darcy law and activation energy are also taken into consideration as novelty. The analysis is examined in view of solutal boundary conditions. Although some investigations are already due to the off-centered disks configurations; however, the bioconvection solutal flow of micropolar nanofluid with variable thermal characteristics has not been focused yet. The consideration of temperature dependent viscosity and variable thermal conductivity is another novel aspect of this model. The flow due to moving disk reports many applications in tesla turbine, wet type of multiplate clutch, gears, gas turbine engines, torque convertor, flywheels, and brakes etc. The mathematical model is formulated in term of partial differential equations which is numerically solved after attaining the dimensionless form. The graphical outcomes for flow parameters are addressed with physical explanations.