Download PDF by Herbert Staedtke: Gasdynamic Aspects of Two-Phase Flow: Hyperbolicity, Wave

By Herbert Staedtke

ISBN-10: 352740578X

ISBN-13: 9783527405787

Right here, the writer, a researcher of remarkable adventure during this box, summarizes and combines the new effects and findings on complicated two-phase stream modeling and numerical equipment in a different way dispersed in numerous journals, whereas additionally delivering reasons for numerical and modeling ideas formerly now not coated through different books. The ensuing systematic and accomplished monograph is unrivalled in its sort, serving as a reference for either researchers and engineers operating in engineering in addition to in environmental technology.

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Extra info for Gasdynamic Aspects of Two-Phase Flow: Hyperbolicity, Wave Propagation Phenomena, and Related Numerical Methods

Sample text

9, the following cases can be distinguished: 1. For saturated upstream reservoir conditions (T0 = T sat ) and low vapor content (0 ≤ Xg ≤ ), the onset of evaporation occurs in the divergent section of the nozzle and critical conditions at the nozzle throat are obtained as (Xg )cr > 0, and ucr = acr . 2. For pure liquid (Xg = 0) with slightly subcooled conditions (T0 < T sat ), the crossing of the saturation line occurs in the divergent section of the nozzle with usat < a2, and the critical conditions reached are as for case (1) at the nozzle throat with (Xg )cr > 0 and ucr = acr .

5 for a water/steam mixture. Fig. 41) (sg − sl )2 (1/ g − 1/ l )2 = al . 42) 2 (sg − sl ) Fig. 24), the equilibrium sound velocity can also be written in a more compact form as 1 a= γ −2β 1/ g − 1/ s g − sl l + 2 . 43) Calculated values for the equilibrium sound velocity as a function of void fraction are shown in Fig. 6 for a saturated water/vapor mixture at atmospheric pressure. The figure indicates two interesting aspects: the thermal equilibrium assumption results in extreme low values for the sound velocity and (2) strong discontinuities for the transition between singlephase liquid or vapor and two-phase conditions which is certainly in contrast to experimental data.

20) of the two fluid model represent an approximation of the nonhomogeneous twophase flow and as such, have not the same validity as the Navier Stokes or Euler equations for single-phase flow of gas or liquid. Nevertheless, two-fluid models form the basis of most present computational tools for the numerical simulation of nonequilibrium two-phases flow processes. However, any application of these models relies on a realistic modeling of the source term on the right-hand side of the equations describing the interfacial transfer processes for mass, momentum, and energy.

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Gasdynamic Aspects of Two-Phase Flow: Hyperbolicity, Wave Propagation Phenomena, and Related Numerical Methods by Herbert Staedtke


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