ESTS0463 LDEF-SS.
LDEF-SS, Solve Equation Two Phase Fluid Flow in Spray Dryers
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES
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| 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.
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.
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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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.
- 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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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.
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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ESTS0463/01
source program mag tapeLDEF-SS FORTRAN Source File SRCTPsource 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
Keywords: desulfurization, finite difference method, flue gas, fluid flow, ice method, particles, two-phase flow.