Abstract
We give a coherent treatment of the hydrodynamic theory of heat exchange based on the perceptions about the unity of the mechanisms of turbulent transfer of heat and momentum (the Reynolds analogy). A conclusion is made that for nonequilibrium two-phase flows the Reynolds analogy is the natural method of describing heat transfer processes, which is capable of applying the results of theoretical analysis to obtain relatively simple analytic solutions. Two extreme cases of motion of two-phase bubble mixture in pipes are singled out: the sliding bubble flow and the coring bubble flow. For each of these limiting regimes of bubble flow, it proved possible to construct, a closed hydrodynamic model of the flow, which is capable of determining both the velocity profiles and the magnitudes of the hydrodynamic drag. Approximate formulas describing the results of accurate analytic studies are obtained. The calculations results and the set of available experimental data were found to be in a good agreement. The relations obtained are used to derive equations for the Reynolds analogy for nonequilibrium flows of a two-phase mixture. A new similarity criterion is obtained taking into account the relative role of the convective and conductive heat transfer mechanisms for flows with “double disequilibrium” (superheated near-wall layer of liquid– subcooled liquid in the core). The potency of this approach is illustrated by solving a number of problems on physics of surface boiling. Besides, it proved possible to obtain analytic solutions of such problems, no introduction of empirical constants matched from experimental data begin made. A solution to the problem of maximal (over the growth—condensation cycle) diameter of parietal bubbles is put forward. A comparison with the set of available experimental data with liquid subcoolings 3–80 K, flow velocities 0.2–9.2 m/s, and densities of heat flux 0.38–8.53 MW/m2 showed a good agreement. The solution of the problem of pressure losses for flow boiling of subcooled liquid showed a good matching both for parameters that are characteristic of power units (velocities 0.5–2.0 m/s, heat fluxes up to 1.5 MW/m2, pressures up to 14 MPa) and for high-performance heat exchange systems (velocities up to 20 m/s, heat fluxes up to 40 MW/m2, pressures up to 14.7 MPa). A consistent use of the Reynolds analogy has enabled us to solve the problem of heat transfer and hydrodynamics of film boiling under forced motion conditions. The relation thus obtained shows a good match with the available experimental data for water (pressures 0.1–21.6 MPa, flow velocities up to 14.2 m/s, densities of heat flux up to 81.2 MW/m2), liquid helium and nitrogen. It is shown that for elevated velocities and subcoolings of liquid, in the regime of film boiling one may, without destruction of the heat-transfer surface, remove heat fluxes exceeding 100 MW/m2. A conclusion is made that the application of the Reynolds analogy holds the key to solving a number of other problems in physics of nucleate boiling.
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Notes
- 1.
We recall that in the classical courses in hydrodynamics, the boundary of viscous sublayer is usually assumed to be \( \delta_{*} = 11.7l_{*} \).
- 2.
The laws of turbulent micro motions were considered in detail in Chap. 5.
- 3.
- 4.
As one could expect from physical considerations, these data give values of \( d_{\hbox{max} } \) that are 2–3 times smaller than those predicted by formula (11.66).
- 5.
Up to a small supplement due to the variation over the channel length of the mean size of near-wall bubbles and the mean density of their packing.
- 6.
There is a relatively narrow region of influence of the velocity of liquid forced motion on the heat transfer during boiling, which can be taken into account, for example, in accordance with the recommendations by Labuntsov and Yagov (1978).
- 7.
Excluding the special case of boiling in deep vacuum.
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Avdeev, A.A. (2016). Reynolds Analogy. In: Bubble Systems. Mathematical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-29288-5_11
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