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The staged system model for a three-stage absorber presented in Eqs. 2-73−2-75, which are instate-space form. A numerical example of the absorber model suggested by Wong and Luus has thefollowing parameters:
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- 1. Determine the range of mean density of a mixture of air in a 50:50 oil-water liquid phase across a range of gas void fractions. The den- sity of oil is 900 kgm³, water is 1000 kgm³, and gas is 10 kgm³. 2. Describe, with the use of sketches, the various flow regimes that can exist in a vertical pipe carrying two-phase flow (liquid and gas).arrow_forwardA mixture of high pressure water and steam at a rate of 0.5 kgs-¹ flows up a vertical tube with an inside diameter of 25.4 mm at a pres- sure 22 bar. Determine the type of flow if the mass quality is 1%. The density of the water is 845 kgm³, the density of steam is 10.8 kgm³, and the viscosity of the water is 1.24 x 104 Nsm2. Answer: Slug flowarrow_forward5. Describe, with the use of sketches, the various two-phase flow regimes that can exist in a horizontal pipe carrying a liquid and a gas. 6. Explain what is meant by gas hold-up and describe ways in which it can be measured.arrow_forward
- A mixture of air and water at a temperature of 25°C flows up through a vertical tube with a length of 4 m and an internal diameter of 25.4 mm with the exit of the tube being at atmospheric pressure. The mass flows of the air and the water are 0.007 kgs¹ and 0.3 kgs-¹, respectively. For air, the density is 1.2 kgm3 and viscosity is 1.85 x 10-5 Nsm-2, and for water, the density is 1000 kgm-3 and viscosity is 8.9 × 10-4 Nsm 2. Answer: 2.7 kNm 2marrow_forwardAt a Pressure of 200 mm Hg, match the substance with the boiling temperature. 69.50°C 1. Benzene 1.92°C 2. Toluene 41.94°C 3. n-Pentane 4. n-Hexane 31.61°Carrow_forwardAt a Pressure of 400 mm Hg, match the substance with the boiling temperature. 62.89°C 1. Styrene 122.69°C 2. Ethanol 3. Toluene 89.48°C 4. Benzene 60.61°Carrow_forward
- 8. A gas is admitted at a rate of 0.015 m³s-¹ to a vertical glass pipe with an inside diameter of 50 mm. The gas bubbles that form travel with a velocity of 32 ms-¹. Determine the gas void fraction and the velocity of the liquid if the volumetric flow is 2.5 x 10-5 m³s-1. Answer: 0.24, 1.7 ms-1 9 Characterise the main concepts of a homogeneous flow model sepa-arrow_forward3. A mixture of air and water at a temperature of 25°C flows up through a vertical tube with a length of 4 m and an internal diameter of 25.4 mm with the exit of the tube being at atmospheric pressure. The mass flows of the air and the water are 0.007 kgs-1 and 0.3 kgs-1, respectively. For air, the density is 1.2 kgm³ and viscosity is 1.85 x 10-5 Nsm-2, and for water, the density is 1000 kgm-3 and viscosity is 8.9 × 10-4 Nsm-2. Answer: 2.7 kNm-2m-1arrow_forward15. Show that for a one-dimensional annular flow in a horizontal pipe with no acceleration, the pressure gradient on the gas core is dp= 4ti dz d√√α where t, is the interfacial shear stress and a is the gas void fraction.arrow_forward
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