Programming compressible fluid

The computer program PROG34 determines the overall pressure drop for the 6-inch tail pipe having a relieving rate of 27,000 Ib/hr. Table 3-11 illustrates both the input data and computer output. The Mach number at inlet condition is 0.0169, and at the critical condition is 0.8874. The critical pressure is 7.985 psia and the overall pressure drop is 0.213 psi. The compressible fluid flow pattern through the pipe is SUBSONIC. 

THIS PROGRAM CALCULATES THE MAXIMUM COMPRESSIBLE FLUID RATE FOR A GIVEN PRESSURE LOSS AND FLUID SYSTEM CHARACTERISTICS. 

THIS PROGRAM PRINTS THE RESULTS OF THE MAXIMUM COMPRESSIBLE FLUID FLOW ONTO A PRINTER. 

C THIS PROGRAM CALCULATES THE PRESSURE DROP OF A COMPRESSIBLE FLUID... 

Laura J. Hageman and J. M. Walsh, HELP - A Multi-Material Eulerian Program for Compressible Fluid and Elastic-Plastic Flows in Two Space Dimensions and Time , Systems, Science and Software report 3SR-350 (1970). 

A program for hydraulic calculations, hydraulics.exe, has been developed to estimate pressure drop for noncompressible fluids, compressible fluids, and two-phase fluids. The main form has been divided into a number of frames for input and results. Calculations can be performed using either SI or English units (SI unit by default). The units are fixed ones, and the program does not allow for change of individual units. 

This problem has been solved in the compressible fluid program here and is presented in Figure 2.20. 

Compressible fluid program performance has also been checked using the HYSYS simulation package and the results are presented Table 2.19. 

The structure of the form is as shown in Figure 2.21. The calculation can be done for two correlations (1) Beggs and Brill and (2) Mukherjee and Brill. The existing calculation method uses only the vapor density as entered by the designer. The program does not calculate vapor density from the user input, as is the case for compressible fluid calculations. Therefore, the data entered in the cells inlet temperature, and vapor molecular weight will not be used for the calculation, and the designer may omit these cells. 

In compressible filter cakes, the porosity varies from a minimum next to the filter septum to a maximum at the cake surface. How could you include such a variation within the context of a simulation program Remember that as the porosity changes, the local fluid velocity will also change as a result of... 

Because the thermal diffusivity of SC water is comparable to that of many high quality insulation materials, gross radial temperature gradients can easily exist in a flow reactor. As shown in Figure 2, radial temperature gradients within the annular flow reactor are negligible. A computer program, which accurately accounts for the effects of the various fluid (solvent, solvent and solute, air) compressibilities on flow measurements, calculates mass and elemental balances for each experiment. A typical experiment evidences mass and elemental balances of 1.00+0.05. 

The simulation program AIOLOS is developed for the numerical calculation of three-dimensional, stationary, turbulent and reacting flows in pulverised coal-fired utility boilers. AIOLOS contains submodels treating fluid flow, turbulence, combustion and heat transfer. In these submodels equations for calculating the conservation of mass, momentum and energy are solved, presupposing high Reynolds-numbers and steady-state flow conditions. It is assumed that the flow field is weakly compressible which means that the density depends only on temperature and fluid composition but not on pressure. 

Supercritical fluid chromatographic pumps must have both a wide range of compensation and use dynamic compressibility compensation to produce accurate and reproducible flow and composition. Whereas water has a compressibility factor of 75 x 10 /bar, methanol is more compressible at 120 X 10 /bar. Carbon dioxide has widely varying compressibility from 95 to 395 X 10 /bar at 5°C, depending on the pump delivery pressure (column head pressure). The viscosity of pure carbon dioxide is 1 /20 the viscosity of pure methanol. During composition programming, the viscosity of the mixed fluid and the column head pressure increases as the modifier concentration increases. Without dynamic compensation, the actual delivery of the carbon dioxide would roll off. The total flow would be less than the set points and the modifier concentration would be more than the set points. 

An important and unique property of capillary SFC is the capability for very fast pressure programming rates. The nearly negligible pressure drop across a short capillary colusin allows the fluid density (or solvating power) to be varied on a nearly instantaneous basis. Enhanced sensitivity results from the low effective k at the time of elution and the substantial "peak compression" (dienomena due to the large density increase (28). 

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