Experimental data on two-phase pressure drops across area changes during flow transients

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Nuclear Regulatory Commission , [Washington]
Pressurized water reactors -- Testing, Pressurized water reactors -- Co
ContributionsWeisman, J, U.S. Nuclear Regulatory Commission
The Physical Object
FormatMicroform
Pagination2 v.
ID Numbers
Open LibraryOL16099543M

@article{osti_, title = {Two phase pressure drop across abrupt area changes in oscillatory flow}, author = {Weisman, J. and Ake, T. and Knott, R.}, abstractNote = {The ability of one-dimensional momentum balances to predict behavior during two-phase oscillatory flow has been examined.

Flow oscillations in a Freon-Freon vapor system were induced by cycling a three. The irreversible pressure drop caused by sheer stress at the wall, sometimes also called distributed pressure drop, because it occurs all along the lengths of the flow channel, is determined by: () Δ p = f L D h ∙ W 2 2 ρ A 2 where f is the friction factor and D h is the hydraulic diameter (equal to four times flow area/wetted perimeter Cited by: 1.

pressure drops across various components of a prototype rod fuel bundle of AHWR. From the measured values of pressure drops, the friction factor for fuel bundle and the loss coefficients for the tie plates and spacers were estimated. The single-phase experimental data were compared with different existing correlations.

Therefore, the objective of this study is to conduct frictional and two-phase flow visualization of air–water two-phase flow through two 90° glass bends subject to upward, downward and horizontal arrangements. The internal diameters and curvature ratio of two bends are D = and mm, 2R/D = andrespectively.

Experimental setupCited by: 6. The experimental pressure drop data was compared with the homogenous model, the Friedel [L. Friedel, Improved friction pressure drop correlations. those observed in two-phase flow in pipes.

To interpret our data of flow rates, pressure drops, and saturations, we have used the generalized Darcy‘s law. The data showed that, contrary to what is commonly assumed, the relative permeability factors are not linearly dependent on saturations.

Thus, KrL is not a uniqueCited by: 2. Keywords—two-phase flow, pressure drops, pressure drop cause by abrupt flow area changes in small experimental pressure drop data are used to test six prediction. 21ème Congrès Français de Mécanique Bordeaux, 26 au 30 août 1 Experimental study of two-phase flow structure and pressure drop across a sudden contraction in a horizontal pipe EM(a), (a), E.K.

SI-AHMED (a, b), J. LEGRAND(b), J.M ROSANT(C (a) Laboratoire de Mécanique des Fluides Théorique et Appliquée, Faculté de physique, U.S.T.H.B. The accuracy of predicting two-phase flow pressure drops in heat exchanger devices is quite important in the design and performance optimization of refrigeration systems.

For a simple example, if the predicting method shows a higher value compared to the real value, the material design will cost by: Experimental values of flow rate, phases superficial velocity, extraction ratio and pressure drops across the tee junction pipes are here reported. Pressure drop test results across the inlet and branch pipes have also been compared with predicted ones.

A new pressure drop correlation have been derived from test Size: KB. 80 R. Nagai et al.: Experimental Study on Two-Phase Pressure Drop through Horizontal Mini-Channel with Y-Branch Table 1.

Channel width, height and hydraulic diameter, respectively for Ch. 1 to 3 W [mm] H [mm] D H [mm] Upstream Ch. 1 Downstream Ch. 2 & 3 Figure 2 shows the present apparatus. data. Abdelali et al. [13] experimentally investigated pressure drops across sudden expansion and contraction in small circular channels, using air and water at room temperature and near-atmospheric pressure as the working fluids.

The measured total two phase pressure changes indicated the occurrence of significant velocity Size: KB. The present study is concerned with the pressure loss due to 60 degree Y-branch in horizontal mini-channel with a rectangular cross-section of mm height × mm width in the upstream channel and of mm height × mm width in the downstream channels.

The pressure loss, the gas phase velocity and the void fraction in the channels upstream and downstream from. Engineering Data Book III Two-Phase Flow and Flow Boiling in Microchannels unexplored, one can expect that a further nanoscale two-phase flow and heat transfer domain may emerge as well for even smaller sizes of channels where yet other File Size: 1MB.

Experiments were performed to study pressure drops in copper foams embedded in a rectangular copper channel. De-ionized water was used as the working fluid with mass fluxes of 30– kg/m2 s, and inlet temperature of 40–80°C.

The copper foam has the porosity of and the pore densities of 30, 60 and 90 ppi (pores per inch). Both single-phase liquid flow and Cited by: The present paper analyzes the experimental results concerning the flow patterns and pressure drops in two-phase flow through an horizontal impacting T-junction, whose outlet pipes are aligned and perpendicular to the inlet pipe.

The test section consists of plexiglass pipes with inner diameter of 10 by: 7.

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tal data a new correlation has been developed to predict two-phase pressure drop in horizontal channels. Key words: two-phase flow, air-mater, pressure drop, small diameter, horizontal tubes Introduction Most of the research reported on two-phase flow behavior deals with the circular tube largerthan 10 mmin diameter.

compared with the experimental data. Based on the experimental data; a new correlation has been developed to predict two-phase pressure drop in horizontal channels. Key words: Two-phase flow, pressure drop 1.

Introduction Most of the research reported on two-phase flow behavior deals with the circular tube and larger than 10 mm in diameter. Single-phase and gas-liquid two-phase pressure drops caused by a sudden contraction in microtubes were experimentally investigated at room temperature and atmospheric pressure, using nitrogen and water.

The experimental results on pressure drop with a novel measurement method, the tiny gaps on the tubes, were used to characterize the sudden Cited by: 6. In fluid mechanics, two-phase flow is a flow of gas and liquid — a particular example of multiphase -phase 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 two-phase flows where one phase is present in the form of particles, droplets, or bubbles in a continuous carrier.

Calculating Two-Phase Pressure Drop Scott S. Haraburda, PE ([email protected]) The flow type of two-phase liquid-gas flow can be characterized into one of seven types the separate pressure drops for both the liquid and the gas are used explicitly, along with the pressure ratio.

Using these, a unique. between the numerical results and the experimental data, good agreement is obtained.

Details Experimental data on two-phase pressure drops across area changes during flow transients PDF

INTRODUCTION Gas-liquid two-phase flow takes the leading role in applications including evaporation and/or condensation, flow through cross-sectional area change (i.e. nozzle, diffuser) and sudden pressure drop (i.e.

flashing). These systemsCited by: 1. Single-phase and two-phase flow pressure drop in the vertical header of microchannel heat exchanger. / Zou, Yang; Hrnjak, Pega S. In: International Journal of Refrigeration, Vol. 44,p. Research output: Contribution to journal › ArticleCited by: 4. Selecting a suitable two-phase flow pressure drop calculation correlation is the basis and a key step to appropriately size a pipeline (or flowline) or process line.

Published two-phase flow pressure drop correlations are applicable for specific situations. Blindly applying a correlation may result in orders of magnitude error(13).

the pressure drops across various components under single-phase (water) and two-phase (air-water) flow conditions. The data were analyzed to obtain friction factor, loss coefficients of spacer and tie plates for different flow rates.

Using Least-square non-linear regression analysis, correlations have been proposed based on the experimental data. Cambridge Core - Thermal-Fluids Engineering - Two-Phase Flow, Boiling, and Condensation - by S.

Mostafa GhiaasiaanAuthor: S. Mostafa Ghiaasiaan. Frictional pressure-drop models for steady-state and transient two-phase flow of carbon dioxide.

Frøydis Aakenes. Master of Science in Product Design and Manufacturing. The analysis carried out in this report would not have been possible without experimental data, thus an important thanks goes to Statoil for giving me access to parts of a Cited by: 7.

A third continuous flow profile is recorded across the set of producing layers.

Description Experimental data on two-phase pressure drops across area changes during flow transients FB2

In a last, optional step, the pressure and flow sensors are repositioned above the top of the uppermost layer and the well is shut in again. The observed transients of rate and pressure are recorded as.

The global two-phase flow parameters include two-phase pressure, interfacial structures and flow regime transition. In order to characterize the frictional pressure drop and minor loss across the vertical elbows, pressure measurements are obtained across the test section over more» a wide range of flow conditions in both single-phase and two.

Two‐phase critical flow of steam‐water mixtures has been investigated over a pressure range from 4 to 43 1b./ abs. and a quality range from saturated vapor to 1% (weight) vapor. Discharges were measured from 1/4‐,1/2‐, 3/4‐, and 1‐in.

pipes and from annuli of intermediate cross‐sectional areas. Subject of this paper is a research of pressure drop of gaseous phase in two-phase (gas-liquid) flow through packed columns. Experimentally obtained data for pressure drop in random bed of metal Pall rings diame4 mm ( experimental runs were conducted with water-air system, where superficial air velocity based on empty column was in rangeFile Size: KB.An experimental investigation on the characteristics of two-phase flow pattern transitions and pressure drop of R, Ra, RA, R and R in horizontal small stainless steel tubes ofand mm inner diameters is by: Abstract— Two-phase forced convective flow in microchannels is promising for the cooling of integrated circuits.

There has been limited research on boiling flow in channels with dimensions below m, in which bubble formation and flow regimes can differ from workdevelopssingle andmulti.