Showing papers on "Slug flow published in 1975"
TL;DR: Kase, S.. J. Appl. Polym. Sci., 18, 3279 (1974). Matovich, M. A,, Pearson, J. R. A,. Ind. Eng. Chem., Fundam., 8, 512 (1969).
Abstract: Kase, S.. J. Appl. Polym. Sci., 18, 3279 (1974). Matovich. M. A,, Pearson, J. R. A,. Ind. Eng. Chem., Fundam., 8, 512 (1969). Miller, J. C., S.P.E. Trans., 3, 134 (1963). Nickell, R. E., Tanner, R. I., Caswell. E., J. FIMMech., 65, 189 (1974). Pearson. J. R. A,, Matovich. M. A,. Ind. Eng. Chem., Fundam., 8, 605 (1969). Pearson, J. R. A,, Shah, Y. T., Trans. SOC. Rheol., 16, 519 (1972). Pearson, J. R. A., Shah, Y. T.. Ind. Eng. Chem., Fundam., 13, 134 (1974). Shah, Y. T., Pearson, J. R. A.. Ind. Eng. Chem., Fundam.. 11, 150 (1972). Trouton, F. T.. Proc. Roy. SOC. Ser. A, 77, 426 (1906). Weinberger, C. B., Ph.D. Dissertation, University of Michigan, 1970 Weinberger, C. B., Goddard, J. D., Int. J. Multiphase Now, 1, 465 (1974).
537 citations
TL;DR: In this paper, the probability density function (PDF) of the fluctuations in void fraction may be used as an objective and quantitative flow pattern discriminator for the three dominant patterns of bubbly, slug, and annular flow.
349 citations
TL;DR: In this paper, the problem of particle loss to the wall of a narrow rectangular channel through which an aerosol is passing is studied with simultaneous consideration of diffusion and sedimentation, and both slug flow and Poiseuille flow are considered.
31 citations
TL;DR: In this paper, the effects of non-Newtonian liquids on the behavior of cocurrent gas-liquid slug flow has been investigated and a new electrically resonating void fraction meter was devised which worked satisfactorily for a wide variety of polymer solutions.
31 citations
01 Jan 1975
TL;DR: In this paper, the capability of published two-phase flow equation sets to predict transient propagation behavior has been studied numerically, and it was shown that only the modified Rudinger-Chang equation set exhibits propagation behavior in good agreement with the experimental observations at low (less than 10 percent) void fractions.
Abstract: The capability of published two-phase flow equation sets to predict transient propagation behavior has been studied numerically The equation sets are those cited by Wallis for separated flow and extensions of those used by Rudinger and Chang for dispersed flow The primary difference between these two sets is that in the set cited by Wallis, the pressure gradient appearing in each momentum equation is weighted by the phase volume fraction, whereas in the extended Rudinger--Chang set, the pressure gradient appears only in the ''continuous'' phase The original Rudinger--Chang set had to be modified because it can adequately describe only the transient flow of very dilute suspensions of solids in air This numerical study shows that pressure pulses propagate at essentially the sound speeds obtained from characteristics analysis for the equation sets investigated Comparisons of numerical results with experimental air-water pressure propagation data show that only the modified Rudinger--Chang equation set exhibits propagation behavior in good agreement with the experimental observations at low (less than 10 percent) void fractions None of the equation sets adequately predict the experimental pressure propagation rates in the range of void fractions from 10 to 60 percent where the flow regime was observed to change frommore » bubbly to full slug flow The modified Rudinger-- Chang set explains an apparent discontinuity in the experimental pressure wave propagation speed at a void fraction of 50 percent if the entire pressure gradient is assumed to be carried by the liquid for less than 50 percent voids and by the vapor for greater than 50 percent voids; however, the magnitude of the calculated discontinuity is greater than the experimental discontinuity (auth)« less
17 citations
TL;DR: In this article, an experimental study was carried out on steady-state boiling of sodium flowing in the annular channel formed around an electrically heated simulation of a fuel pin, where the inlet temperature and flow rate were held constant up to the inception of boiling.
Abstract: An experimental study was carried out on steady-state boiling of sodium flowing in the annular channel formed around an electrically heated simulation of a fuel pin. In the present experiment, the inlet temperature and flow rate were held constant, and the heat flux was gradually increased up to the inception of boiling. Thereafter, the heat flux was further increased step by step until the surface temperature of the heater pin marked a sharp rise, indicating the occurrence of dry-out. Records were obtained of the changes brought by the increasing heat flux to boiling phenomena, with particular reference to the behavior of the two-phase flow pattern and to the characteristics of boiling noise, as well as of the frequency of bubble formation. It was made clear that there exists a region in which steady-state boiling will be established, and under these conditions the two-phase flow pattern changes sequentially from bubbly flow to slug flow and then to annular flow. This behavior of sodium boiling in a narr...
12 citations
TL;DR: In this article, the problem of steady-state heat transfer in slug flow in a circular pipe with constant physical properties and negligible axial heat conduction was solved using both of the Laplace transform with respect to the axial co-ordinate and of Galerkin's technique in the transform domain.
11 citations
01 Nov 1975
TL;DR: In this paper, a rod bundle consisting of four vertical 0.25-inch diameter by 24.0 inch long rods arranged in a single row was used to study the flow patterns of bubble flow, froth flow, slug flow, and annular flow.
Abstract: Flow patterns that occur in a rod bundle with forced upward flow of boiling water have been photographed. The experimental rod bundle consisted of four vertical 0.25-inch diameter by 24.0 inch long rods arranged in a single row. The tested conditions were: pressure--400 to 2000 psia, mass velocity--250,000 to 4,000,000 lb/hr-ft$sup 2$, and heat flux (uniform)--up to 1,600,000 Btu/hr-ft$sup 2$. The observed two-phase flow patterns were bubble flow, froth flow, slug flow, and annular flow. The flow patterns were mapped at constant pressure on plots of mass velocity versus flowing quality. (auth)
1 citations
01 Nov 1975
TL;DR: In this article, a simple technique for handling arbitrary fluid temperature variation with time by approximating it by a sequence of ramps or steps for which exact analytical solutions are available is presented for laminar, constant property, slug flow over a plate convectively cooled from below.
Abstract: Solutions for the surface temperature and surface heat flux are found for laminar, constant property, slug flow over a plate convectively cooled from below, when the temperature of the fluid over the plate varies arbitrarily with time at the plate leading edge. A simple technique is presented for handling arbitrary fluid temperature variation with time by approximating it by a sequence of ramps or steps for which exact analytical solutions are available.