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ESTS0463 LDEF-SS.

LDEF-SS, Solve Equation Two Phase Fluid Flow in Spray Dryers

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1. NAME OR DESIGNATION OF PROGRAM:  LDEF-SS.
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2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
LDEF-SS ESTS0463/01 Arrived 02-MAY-2001

Machines used:

Package ID Orig. computer Test computer
ESTS0463/01 IBM 3033
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3. DESCRIPTION OF PROGRAM OR FUNCTION

LDEF-SS solves the equations for the two-phase fluid flow in spray dryers. It calculates, by a particle method, the dynamics and vaporization of a single component liquid spray. The spray is fully-coupled to a two-component gas, consisting of an inert species and the vapor of the liquid. The effects of drop collisions and coalescence are included. The geometry is spatially two-dimensional and axisymmetric, and swirling motion is permitted about the dryer axis. A wide variety of dryer parameters, such as dryer size and geometry and atomizer size and speed, and operating conditions, such as gas-flow rates and temperatures, can be specified by user-supplied parameters. Program  output includes contour, vector, and spray plots, supplemented by numerical results.
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4. METHOD OF SOLUTION

The equations for a single-component liquid moving and evaporating in a two-component gas composed of air and the vapor of the liquid are solved by finite-difference methods. LDEF-SS incorporates the basic methodology of the stochastic parcel  (SP) method, as well as many other features of the numerical solution procedure of Dukowicz, in conjunction with the Implicit Continuous-fluid Eulerian (ICE) method. An algorithm was added to calculate the effects of drop collisions. The ordinary differential  equations governing the changes in drop properties are approximated  by first-order methods. The finite-difference equations for the gas- phase properties are obtained by a control-volume derivation. An eddy diffusivity approximation is used to calculate the turbulent transport of mass, momentum, and energy in the gas.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

LDEF-SS does not calculate the gas-phase transport of sulfur dioxide and its dissolution and reaction with the liquid.
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6. TYPICAL RUNNING TIME

NESC executed the sample problem in 36 CP minutes on a CDC CYBER175 and in less than 6 CPU hours on an IBM4331.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
ESTS0463/01 02-MAY-2001 Masterfiled Arrived
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10. REFERENCES

- Gail Rein,
  J501 SC-4020 Emulation, User Manual,
  LANL PIM-2 Program Library Write-Up, May 1981.
- LDEF-SS, NESC No.1027.7600B, LDEF-SS CDC Version Tape Description
  and Implementation Information,
  National Energy Software Center Note 86-03, October 25, 1985.
- John K. Dukowicz,
  A Particle-Fluid Numerical Model for Liquid Sprays,
  Journal of Computational Physics, Vol. 35, No. 2, PP. 229-253,
  April 1980.
ESTS0463/01, included references:
- Peter J. O'Rourke and Willard R. Wadt:
  A Two-Dimensional, Two-Phase Numerical Model for Spray Dryers
  LA-9423-MS (July 1982).
- L. Eyberger:
  LDEF-SS IBM Version Tape Description and Implementation Informatio
  NESC Note 86-04 (October 25, 1985).
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11. MACHINE REQUIREMENTS

127,000 (octal) words of memory are required  to execute the sample on a CDC CYBER175; the IBM version requires 460K bytes of memory on an IBM4331.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
ESTS0463/01 FORTRAN+BAL
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

LTSS (CDC7600), NOS 1.4 (CDC CYBER175), VM/CMS (IBM4331).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Due to  the iteractive nature of the calculations in LDEF-SS, machine round-off error may produce slightly different results on different  machines.
For the CDC version, the FORTRAN compiler OPTION, ROUND, should be invoked to duplicate the sample problem output. This version includes NESC-provided dummy routines for the LANL Stromberg-Carlson plotter routines: ADV, DRV. GPLOT, GRPHFTN, GRPHLUN, LIB4020, LINCNT, PLT, and SETFLSH, which should be replaced with suitable alternatives for the environment in which the  program  is being executed to obtain graphical output.
In the IBM3033 version, subroutines DTIME and DATES are written in assembly language; they return the time of day and date information, respectively. Proprietary Calcomp plotting routines PLOT, PLOTS, NEWPEN, WHERE, NUMPEN, and SYMBOL, used to provide the  graphic output in the IBM version, are not included and should be replaced with alternatives suited to the local computing environment for graphical output.
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15. NAME AND ESTABLISHMENT OF AUTHORS

  7600     P.J. O'Rourke
           Los Alamos National Laboratory
           P.O. Box 1663
           Los Alamos, New Mexico 87545

  3033     M.D. Marks
           Dow ChemicaL U.S.A.
           Midland, Michigan 48640
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16. MATERIAL AVAILABLE
ESTS0463/01
source program   mag tapeLDEF-SS FORTRAN Source File                SRCTP
source program   mag tapeSubroutine DTIME Assembler Source          SRCTP
source program   mag tapeSubroutine DATES Assembler Source          SRCTP
test-case data   mag tapeSample Problem Input                       DATTP
test-case data   mag tapeJCL Control Information                    DATTP
report                   LA-9423-MS (July 1982)                     REPPT
prog. note               NESC Note 86-04 (October 25, 1985)         NOTPT
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: desulfurization, finite difference method, flue gas, fluid flow, ice method, particles, two-phase flow.