Thermohydrodynamic calculations

Knoll G., Peeken, H6ft H-W. - Thermohydrodynamic calculation of end face seals , Proc. of the 14" International Conference on Fluid Sealing, BHRA, pp. 367-383, Firenze, Italy, April... 

In this section we present the system of quasi-one-dimensional equations, describing the unsteady flow in the heated capillary tube. They are valid for flows with weakly curved meniscus when the ratio of its depth to curvature radius is sufficiently small. The detailed description of a quasi-one-dimensional model of capillary flow with distinct meniscus, as well as the estimation conditions of its application for calculation of thermohydrodynamic characteristics of two-phase flow in a heated capillary are presented in the works by Peles et al. (2000,2001) and Yarin et al. (2002). In this model the set of equations including the mass, momentum and energy balances is ... 

The velocity of ideal deton is completely determined by the thermohydrodynamics of the explosive, with.the independent variables being the original density p of the expl and its chem compn, all quantities being calculable, at least in principle, thru the thermohydrodynamic theory and an apppropriate equation of state. For each given ideal explosive, velocity. is a function only of the original density, i.e., D=D(p ), but three fundamentally different types of D(p ) relations have been found in ideal deton. The most common is the linear D(p ) relation characteristic of solid C-H-N-0 expls at densities... 

Preceding discussions (in this chapter and Chapter 8) relate to problems attending the measurement of propagation rates in heavy-metal azides. The alternative of calculating the maximum, steady-state detonation rates in these azides from first principles is not well established. Nevertheless, a one-dimensional thermohydrodynamic model does exist which can yield reasonable values for detonation properties (velocity, pressure, product density and composition, particle velocity, etc.) [113-119]. 

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