since knowledge on hydrodynamic torque of a butterfly valve is very important for butterfly valve design, its hydrodynamic torque is investigated in this paper. in reality, the investigation of the loss coefficient and torque from some experiments will take a long time and a lot of money. this paper presents a statistical study of the flow past the butterfly valve in a static analysis using com...

Since knowledge on hydrodynamic torque of a butterfly valve is very important for butterfly valve design, its hydrodynamic torque is investigated in this paper. In reality, the investigation of the loss coefficient and torque from some experiments will take a long time and a lot of money. This paper presents a statistical study of the flow past the butterfly valve in a static analysis using com...

B = dimensionless coefficient in polynominals b = dimensionless coefficient in polynominals F = dimensionless radial velocity G = dimensionless tangential velocity H = dimensionless axial velocity K = 7 / 2 p r ~ ( v u ) ' / ~ , dimensionless parameter Q = $ow rate 8' = dimensionless flow rate r = radial coordinate u = radial velocity II = tangential velocity w = axial velocity z = axial coordi...

The migration of a planet through a gaseous disc causes the locations of their resonant interactions to drift and can alter the torques exerted between the planet and the disc. We analyse the time-dependent dynamics of a non-coorbital corotation resonance under these circumstances. The ratio of the resonant torque in a steady state to the value given by Goldreich & Tremaine (1979) depends essen...

Purpose. Development of a method for simulating the screwing torque/moment and researching design double-shoulder threaded joints while preserving their geometric parameters. Determination optimal length additional shoulder pin part developed drill collar (DC) NC50, NC55 type various standard sizes. Establishing dependence between other parameters joint DC further use when developing sizes simi...

The vibration performance is critical to the suspension control and torque precision of magnetically suspended momentum flywheel (MSMW). translational torsional MSMW are investigated in this article, damping regulation method proposed improve anti-vibration MSMW. Firstly, modellings MSMW, including dynamic models displacement coordinate, developed, comprehensive characteristics investigated. Mo...

frying is an important unit operation used widely both in domestic and industrial cooking. reduced pressure (vacuum), microwave, deep fat and pan frying are the most important methods of food frying. final product has good organoleptic quality (colour, texture, and flavour). the accuracy of the knowledge of mass transfer parameters (effective diffusivity coefficient, dimensionless biot number a...

This paper presents an investigation of the hydro elastic behavior of vibrating blades in hydraulic machines, which is of strong interest for turbo machinery applications. As a representative case study for vibrating blade in hydraulic machines, a NACA 0009 oscillating hydrofoil is considered. The aim is to model the hydrodynamic moment acting on the oscillating hydrofoil. Two types of oscillat...

Cp = heat capacity at constant pressure, J= K kg Cv = heat capacity at constant volume, J= K kg c = concentration, mol=m E = total energy, J=m H = shape factor, = , dimensionless h = specific enthalpy, J=kg h = heat of formation, J=kg J = diffusive mass flux, kg=m s Keq = equilibrium constant k = reaction rate coefficient Le = Lewis number, dimensionless M = Mach number, dimensionless ns = tota...