Total pressure

About: Total pressure is a research topic. Over the lifetime, 5199 publications have been published within this topic receiving 66658 citations.

Experimental investigations of pressure loss and heat transfer in a 180° bend of a ribbed two-pass internal cooling channel with engine-similar cross-sections

Abstract: Numerical investigations of a two-pass internal cooling channel with engine representative cross-sections related to turbine blade cooling were conducted. The channel consisted of a trapezoidal leading edge pass, a sharp 180° bend, and a nearly rectangular outlet pass. The numerical predictions were validated against experimental results in terms of pressure distributions, total pressure losses, and local heat transfer coefficient distributions. The investigations focused on the influence of rib turbulators and tip-to-web distance on the pressure loss and heat transfer. The channel was equipped with skewed ribs (α = 45°, P/e = 10, and e/dh = 0.1) in a parallel and a staggered configuration. The dimensionless tip-to-web distance Wel/dS was varied from 0.6 to 2.0. The investigated Reynolds number was 50 000. The computational study was performed by solving the Reynolds-averaged Navier—Stokes equations with the commercial finite-volume-solver FLUENT and three turbulence models: the realizable k—e tur...

MHD heat transfer two-ionized fluids flow between parallel plates with Hall currents

Abstract: A theoretical attempt is made to investigate the effect of Hall current on temperature distribution in MHD two-fluid flow of ionized gases (plasma) through horizontal channel bounded by two parallel plates under the action of an applied transverse magnetic field. It is assumed that the magnetic Reynolds number is small. The fluids in the two regions are considered to be incompressible, immiscible and electrically conducting with different viscosities, electrical and thermal conductivities. The transport properties of the two fluids are taken as constant. The governing momentum and energy equations for two-fluids that flow in two regions are detailed when the temperature of the two plates are prescribed to be the same. The solution is carried out in two cases, that is, (1) when the plates are made of the non-conducting and (2) conducting materials. The profiles for temperature distribution and rate of heat transfer coefficients are plotted for different set of values of the governing parameters. The effect of parameters on the temperature distribution and rate of heat transfer coefficient is discussed. It is observed in the case of non-conducting plates that the temperature distribution is independent of the ratio of electron pressure to the total pressure which relies on this parameter for conducting plates. It is seen in the case of conducting plates that an increase in Hall parameter diminishes the temperature distribution in the two regions for fixed values of the remaining parameters (i.e., Hartmann number, viscosity ratio, height ratio, electrical conductivity ratio and the ratio of thermal conductivities). It is expected that this theoretical study may have some practical application to numerous diversified areas like geophysical flows, aerospace science, in particular, aerodynamic heating and in engineering applications such as MHD generators, Hall accelerators, in thermo-nuclear power reactors and so forth.

Three-body interactions and solid-liquid phase equilibria: application of a molecular dynamics algorithm.

Abstract: The effect of three-body interactions on the solid-liquid phase boundaries of argon, krypton, and xenon is investigated via a novel technique that combines both nonequilibrium and equilibrium molecular dynamics. The simulations involve the evaluation of two- and three-body forces using accurate two-body and three-body intermolecular potentials. The effect of three-body interactions is to substantially increase the coexistence pressure and to lower the densities of liquid and solid phases. Comparison with experiment indicates that three-body interactions are required to accurately determine the total pressure. In contrast to vapor-liquid phase equilibria, the relative contribution of three-body interactions to the freezing pressure exceeds the contribution of two-body interactions at all temperatures.