Table of Contents
What is two-phase flow pipe?
In two-phase flow in pipes, liquid and vapor phases travelling at different velocities (slippage) result in in-situ liquid volume fractions which differ from the ori- ginal liquid input content. Liquid holdup is defined as the fraction of the volume of a segment of the pipeline which is occupied by liquid.
What is two-phase gas-liquid flow?
Two-phase gas-liquid flows can occur in various forms, such as flows transitioning from pure liquid to vapor as a result of external heating, separated flows, and dispersed two-phase flows where one phase is present in the form of droplets, or bubbles (i.e. liquid or gas) in a continuous carrier fluid phase (i.e. gas …
Why is two-phase flow important?
It is important to predict the flow phases as well as the flow regimes, i.e., characteristic flow patterns based on the interfaces formed between the phases. This knowledge enables prediction of the pressure drop and heat transfer characteristics based on the flow rate, channel size and operating conditions.
What is line sizing criteria?
When sizing lines the sizing criteria shall be minimum life cycle cost, this may include evaluation of functional requirements, cost of piping, weight, CO2-tax, energy costs, mechanical and process limitations, expected lifetime of piping, maintenance cost etc.
What is meant by 2 phase?
two-phase. adjective. (of an electrical circuit, device, etc) generating or using two alternating voltages of the same frequency, displaced in phase by 90°Also: quarter-phase.
How do you calculate 2 phase current?
two phase power calculation
- jatin333 said:
- P = sqrt(3) x U x I x Cos Ø
- P = U x I x Cos Ø
- P = V x I X Cos Ø
Which is better 2 phase or 3 phase?
Three-phase electric power requires less conductor mass for the same voltage and overall power, compared with a two-phase four-wire circuit of the same carrying capacity. It has replaced two-phase power for commercial distribution of electrical energy, but two-phase circuits are still found in certain control systems.
What is flow quality?
The flow quality in a two-phase fluid flow is defined as: The relations between x, α, and S can be deducted, and the result is: Effect of S on α vs. x for water at 7 MPa.
How do I choose a pipe size?
The equation for pipe diameter is the square root of 4 times the flow rate divided by pi times velocity. For example, given a flow rate of 1,000 inches per second and a velocity of 40 cubic inches per second, the diameter would be the square root of 1000 times 4 divided by 3.14 times 40 or 5.64 inches.
What is two-phase fluid flow line sizing?
Eq.11 Point to note, two-phase fluid flow line sizing shall be carried out based on each pipe segment in a piping system. This is important as the fluid properties such as densities, viscosities etc. are not constant and the fluid flow regime changes throughout a piping length.
What is the phase of the liquid phase of a pipe?
The liquid portion moves along the bottom part of the pipe. This flow is expected to occur when the liquid phase is at 0.61 m/s with the vapour phase less than 1.22 m/s (Coker, 2007). Stratified flow is another common two-phase flow seen in horizontal piping.
How to determine the two phase flow regime of a pipe?
For liquid and gas phases, a process engineer shall require the flowrates (kg/h), density (kg/m3 ), viscosity (cP) and surface tension (N/cm). The information is then used to establish the two-phase flow regime. Besides this, the pipe layout such as pipe size, length and fittings shall be considered in calculating the pressure drop.
What is two-phase flow?
What is two-phase flow? Single-phase flow → fluid flow in a single state Multiphase flow → simultaneous flow of several fluid phases Common multiphase flow are (i) gas-liquid, (ii) liquid-liquid or (iii) liquid-solid. Why is it so important? Severity of pressure drop problems that may result to operational problems in a process