Flowrate, calculation from pressure drop

This problem may be solved by using equation 3.23 and Fig. 3.8 to find the volumetric flowrate and then calculating the pressure drop through the alternative pipe system. From... 

For direct measurement from core samples, the samples are mounted in a holder and gas is flowed through the core. The pressure drop across the core and the flowrate are measured. Providing the gas viscosity (ji) and sample dimensions are known the permeability can be calculated using the Darcy equation shown below. 

On determining the optimal flowrate q (gal/min) and pressure drop across the bit nozzles p, the total flow area is calculated from... 

Before the pressure drop can be calculated from equation 5.28, it is still necessary so know the in-line concentration of solids in the pipe for a given flowrate and discharge concentration. Furthermore, it is necessary to know how the liquid and solid are distributed between the two layers. 

Pressure drop during condensation results essentially from the vapor flow. As condensation proceeds, the vapor flowrate decreases. The equations described previously for pressure drop in shell-and-tube heat exchangers are only applicable under constant flow conditions. Again the exchanger can be divided into zones. However, in preliminary design, a reasonable estimate of the pressure drop can usually be obtained by basing the calculation on the mean of the inlet and outlet vapor flowrates. 

The Carman-Kozeny equation relates the drop in pressure through a bed to the specific surface of the material and can therefore be used as a means of calculating S from measurements of the drop in pressure. This method is strictly only suitable for beds of uniformly packed particles and it is not a suitable method for measuring the size distribution of particles in the subsieve range. A convenient form of apparatus developed by Lea and Nurse 22 1 is shown diagrammatically in Figure 4.4. In this apparatus, air or another suitable gas flows through the bed contained in a cell (25 mm diameter, 87 mm deep), and the pressure drop is obtained from hi and the gas flowrate from h2. 

A liquid chromatographic column packed with 5.00 fim diameter solid support particles and having a porosity e = 0.400 is found to have a flow resistance parameter 750. Calculate the specific permeability K0. Assume that the flowrate/pressure drop relationship is identical to that of a bundle of identical parallel capillaries whose axes are spaced (in a square cross-sectional array) a distance of 5.00 /im from one another. What is the single capillary diameter of the hypothetical bundle ... 

Because it is known that the flowrate of naphthalene has been reduced by 50%, the new outiet pressure from P-201 can be calculated from Equation 119.71. The feed pressure remains at 80 kPa. At a naphthalene flow of 6.41 Mg h, Equation 119.71 gives a pressure increase of 455.73 kPa, so P3 = 535.73 kPa. Because the flowrate has decreased by a factor of 2, the pressure drop in the fired heater decreases by a factor of 4 (see Equation rE19.7a11. Therefore, P5 = 510.73 kPa. Therefore, the pressure of Stream 6 must be 510.73 kPa. The flowrate of air can now be calculated from the conpressor curve equatiom... 

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