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산업용 동심 환형덕트 내의 Shear-Thinning 유체유동에 대한 압력손실 예측에 관한 연구
이동렬 한국경영공학회 2009 한국경영공학회지 Vol.14 No.2
Numerical Predictions of dimensionless pressure loss (friction factor times Reynolds number) have been acquired for fully developed and incompressible laminar flow of a Modified Power Law fluid in a concentric annular duct for industrial use. The solutions are applicable to shear-thinning fluid flow over a wide shear rate range from Newtonian behavior at low shear rates through a transition region to power law behavior at higher shear rates. The computer-aided engineering analysis developed a dimensionless shear rate parameter which for a given set of operating conditions specifies where in the shear rate range a particular system is operating. i.e., Newtonian. transition or power law region. The computer simulation results of the dimensionless pressure loss for the Newtonian and Power Law regions are compared with previously published asymtotic results presenting agreement within 0.02% in the Newtonian region and 0.3% in the power law region.
이동렬 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.3
This research is to investigate the performance analysis of micro gas turbine for power generation with three different numbers of the nozzle vane in the micro gas turbine. Velocity, pressure. and temperature distributions of fluid over the flow domain of the turbine and turbulent kinetic energy of three different turbine blades are numerically calculated for the optimum design of turbine blade with two different rotational speeds of the turbine blade (10000 and 20000 RPM). Ultimately, the energy-efficient and maximum power-generated shape of the nozzle vane are determined through two different rotational speeds of the turbine with three shapes of the nozzle vane (6, 8, and 12 EA).