Two phase flow in pipelines and heat exchangers pdf merge

Actually, the terms two component flow and two phase flow are often used rather loosely in the literature to mean liquidgas flow and liquidvapor flow respectively. As long as two phase flow exists in the pipeline, the pipeline is defined as two phase pipeline. His research activities include complex fluid flow, rheology, viscoelastic fluids, turbulent drag reduction, heat and mass transfer, emergency relief design, multi phase flow, and electrochemical engineering. Introduction gas liquid two phase flow in pipes is a common occurrence in the petroleum industry production and transportation of oil and gas. Depending upon the flow regime, the liquid in a twophase flow system can be accelerated to velocities approaching or exceeding vapour velocities. Lmtd applications in two phase heat transfer and two phase heat exchangers xinliu carrier corporation, united technologies p.

Twophase flowheat exchangers fundamentalsand design. Lmt0 applications in twophase heat transfer and two. This approach requires knowledge of the void fraction and the twophase multiplier. Fill two phase flow in pipelines and heat exchangers chisholm, download blank or editable online. Accurate prediction of the flow pattern, pressure drop and liquid holdup is imperative. A general correlation for saturated twophase flow boiling heat transfer inside horizontal and vertical tubes, j. Slip defined in terms of steam quality by combining. Several studies have produced flow pattern maps that show surprising differences in flow regime boundaries for data. Module 12a two phase fluid flow and heat transfer rev 02. Two phase flow in vertical line katmar chemical 11 jun 08.

Mar 03, 2017 types of gasliquid flow contd plug flow. Heat transfer to flow of airwater mixture through a. Route optimization of pipeline in gasliquid twophase. Hand, prediction of holdup and frictional pressure loss in twophase horizontal and downward, cocurrent flow. Depending on the mass flow rate, the heat flux, and the fluid, either or both of these heat transfer mechanisms may be significant. Edwards, methodology for sizing relief valves for twophase gasliquid flow, proceedings of the process plant. Two phase flow on the shell side of a shell and tube heat exchanger is complex. Secondary water, circulating in a loop between the two heat exchangers, absorbs the heat at the hot end and dissipates it at the cold end. One of the practical challenges associated with mchx is the uniform distribution of two. Lmtd applications in twophase heat transfer and twophase heat exchangers xinliu carrier corporation, united technologies p. Develop a novel modeling and simulation framework of heat exchangers considering two phase flow instabilities and transient phenomena.

Sign, fax and printable from pc, ipad, tablet or mobile with. Two phase heat exchangers are widely used in the power. A critical assessment of twophase flow distribution in. A wide range of models have been developed for two phase flow systems. The most classic heat exchange apparatus is shell and tube heat exchanger. Designing of twophase flow heat exchangers and practice strategy of heat exchanger design j. Due to separation of the two phases in the manifolds, the gas and the liquid is distributed unequally into the heat transfer tubes. Albrecht 495 postchf heat transfer in boiler tubes w. Airwater is an example of two phase multi component flow.

The current study has investigated twophase refrigerant. Usually, the when uniformity is enhanced, better heat transfer performance is achieved. Airwater is an example of twophase multi component flow. Proceedings of international symposium on twophase modelling and experimentation, rome, 1995. In an oilgas mixture transportation pipeline, the oilgas ratio may vary a lot in different parts. Proceedings 15th workshop 1993 59 performance of plate heat exchangers under single and twophase flow conditions experimental results m. Box 4808, carrier parkway syracuse, ny 221 abs1racf the lmtd concept is based on the assumptions of a constant heat transfer coefficient and constant specific heat of fluids. Shell and tube heat exchangers are widely used in the process industry for boiling applications. Types of phase flows and gas liquid system piping guide.

Systematic experimental study of two phase flow instabilities in a single and in parallel chanels. Single phase vs multi phase fluid flow single phase fluid flow. Thus, for the design and optimization of compact heat exchangers based on parallel flow technology, the understanding of twophase distribution is of great importance. Twophase flow on the shell side of a shell and tube heat. The engineers developed the terminology rather than the chemists. The art and science of the design of such heat exchangers have advanced considerably in recent years. Kastner 553 twophase pressure drop in boiler tubes w. Here, the two fluids are considered to be travelling at. As long as twophase flow exists in the pipeline, the pipeline is defined as twophase pipeline. Twophase cocurrent flow in inclined pipe sciencedirect. Some elements of a heatexchanger design require a more complex analysis. Twophase flow and heat transfer in helical coils were investigated using computational fluid dynamics and population balance modeling.

Heat and flow characteristics of two phase gasliquid mixture flow. Dividing and combining pipe junctions commonly occur in many types of. Taborek 473 elements of two phase flow in fossil boilers j. Twophase flow in pipelines and heat exchanges duncan chisholm on. Kastner 575 design considerations for fossilfired steam. For single phase flow is easier, rather than two phase flow, due to complicated interaction between phases. Twophase flow distribution in plate heat exchanger and.

Actually, the terms twocomponent flow and twophase flow are often used rather loosely in the literature to mean liquidgas flow and liquidvapor flow respectively. The analysis of twophase condensation heat transfer. Argonwater is an instance of twophase twocomponent flow. Twophase flow can occur in various forms, such as flows transitioning from pure liquid to vapor as a result of external heating, separated flows, and dispersed twophase flows where one phase is present in the form of particles, droplets, or bubbles in a continuous carrier phase i. Twophase flow heat exchangers are vital components of systems for power generation, chemical processing, and thermal environment control. In the case of shelltube condensers, the subcooling is realized in a separate heat exchanger subcooler. Designing of two phase flow heat exchangers and practice strategy of heat exchanger design j.

Twophase flow and pressure drop in flow passages of. Eyaporation heat transfer in general, flow boiling heat transfer takes place through two different mechanisms. Two phase flow in pipelines and heat exchangers chisholm, d on. Intermittent type twophase flow alternate plugs of liq. The map is based on data for steam and water in pipes up to 30mm in diameter. Source terms from twophase flow in long pipelines following. In the homogeneous model, the two phases are assumed to be travelling at the same velocity in the channel and the flow is treated as being analogous to a single phase flow see article on multiphase flow. For singlephase flow is easier, rather than twophase flow, due to complicated interaction between phases. Pdf simulation of two phase flow and heat transfer in. Singlephase vs multiphase fluid flow nuclear power. Twophase flow in pipelines and heat exchangers duncan.

In drainage pipes of oilgas separators, the flowing liquid is basically crude oil, but along the pressure drop some dissolved gas would come out. Twophase flow on the shell side of a shell and tube heat exchanger is complex. Twophase flow in vertical line pipelines, piping and fluid. Twophase gasliquid pipe flow and relief sizing aiche. In some cases these velocities are higher than desirable for a process piping system. In fluid mechanics, twophase flow is a flow of gas and liquid a particular example of multiphase flow. The design of these units is usually based on a onedimensional formulation of the flowing fluid. Twophase flow in pipelines and heat exchangers duncan chisholm snippet view 1983. Some examples of the equations for calculation of heat transfer coefficient in application for twophase. Since the highpressure side of the vapor compression cycle can have a condenser or a gas cooler, for which there is no twophase. Route optimization of pipeline in gasliquid twophase flow. Taborek 473 elements of twophase flow in fossil boilers j. In the homogeneous model, the two phases are assumed to be travelling at the same velocity in the channel and the flow is treated as being analogous to a single phase flow see article on multiphase flow separated flow models. Twophase flow distribution in heat exchanger manifolds.

Also, the working principles of microchannel heat exchangers in flow. Singlephase vs multiphase fluid flow singlephase fluid flow. Such high velocities can cause a phenomenon known as erosion corrosion in equipment and piping systems. Box 4808, carrier parkway syracuse, ny 221 abs1racf the lmtd concept is based on the assumptions of a constant heat. His research activities include complex fluid flow, rheology, viscoelastic fluids, turbulent drag reduction, heat and mass transfer, emergency relief design, multiphase flow, and electrochemical engineering. Phenomena in twophase flow system pingwen ming, ziqiu shen 172 all effects of vapor phase on boiling heat transfer zhongning sun, changqi yan, ze du 180 a12 twophase flow pattern and pressure fluctuation of twophase upward flow in a utype tube bofeng bai, tiejun wu, liejin guo, ximin zhang 187. A wide range of models have been developed for twophase flow systems. Therefore, the important characteristic of a heat exchanger design is. Twophase flow and pressure drop in flow passages of compact. Kastner 553 two phase pressure drop in boiler tubes w. Two phase flow in pipelines and heat exchangers chisholm fill. This approach requires knowledge of the void fraction and the two phase multiplier. Previous work on single phase distribution in parallel flow heat exchangers 1, 2, have shown that the pressure drop over the tubes and the pressure drop related to the flow.

Twophase flow distribution in compact heat exchanger manifolds. Classic study of fluid dynamics concentrates on the flow of a single homogeneous phase, e. All of the fluid flow equations and relationships discussed normally in this section are for the flow of a single phase of fluid whether liquid or vapor. Lmt0 applications in twophase heat transfer and twophase. Two phase flow heat exchangers are vital components of systems for power generation, chemical processing, and thermal environment control. A circulation pump is used to circulatethe secondary water between the two heat exchangers. Line sizing and pressure drop calculation for two phase fluid flowing through a horizontal pipe. Experimental data have been acquired in a heat exchanger test rig specially made for measurement of mass.