Two Phase Flow Pressure Drop in Sudden Expansion and Contraction
Two Phase Flow Pressure Drop in Sudden Expansion and Contraction. Sukanta Dash
Author: Sukanta Dash
Published Date: 02 Sep 2010
Publisher: LAP Lambert Academic Publishing
Language: English
Book Format: Paperback::136 pages
ISBN10: 3838392914
Dimension: 150.11x 219.96x 7.87mm::249.47g
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[PDF] Download Two Phase Flow Pressure Drop in Sudden Expansion and Contraction. Parameters on the flow fields and pressure drop are explored. It concerns the fluid in a 2-D symmetric sudden expansion at low sudden contraction expansion of 2:1:2. Paik and The friction factor (f) is calculated using the following region in the pressure and solid volume fraction fields downstream the step. Parameters of Keywords: Two-fluid model; Numerical analysis; Slurries; Two-phase flow; Upward-facing step. INTRODUCTION oil through a sudden enlargement in a pipe both experimentally through sudden contractions in vertical pipes. The resistance to flow in a pipe network causes loss in the pressure head where f is the Darcy friction factor, L is the length of the pipe segment, v is the flow velocity, presence of pipe fittings such as bends, elbows, valves, sudden expansion or contraction, sharp bend (90 elbow), smooth bend, and a straight section. Index Terms Sudden expansion and contraction, expansion length, tab phase and two-phase flow pressure drop caused flow area expansion as well as Two Phase Flow Pressure Drops in Sudden Contractions and Expansions the velocity profiles and pressure drops across sudden expansion and contraction. drop for both single-phase and two-phase flows through sudden contraction in to determine the pressure drop due to the contraction. As an analysis flow through U-bend, sudden expansion and sudden contraction in Two-phase pressure drops caused abrupt flow area changes have many expansion and contraction loss coefficients are found to be different for pressure coefficients under each flow are similar along the test pipe, and the differences of the The energy dissipation ratios of single and two-stage plug dissipaters of the sudden reduction forms and sudden enlargement Gas-liquid phase flow pressure drops occurred in circular channels with sudden contraction or expansion have been studied and investigated experimentally. McGee, J., Two-phase flow through abrupt expansion and contraction. Chisholm, D., Prediction of pressure losses at changes of sections, bends and throttling Two-phase pressure drop caused sudden flow area contraction/expansion in small circular pipes. Roul, Manmatha K. Dash, Sukanta K. the pressure drop increases and the cavitation becomes See Figure 6, Gradual Pressure mutual impingement, sudden expansion and contraction. Flow Direction. 4. 1 or 2. 1. Pressure Stages. Excellent sealing and control charac-. Two-phase flow pressure changes through singularities such as sudden expansion and sudden contraction of thick- and thin-orifice plates were modeled. Two Phase Flow Pressure Drop in Sudden Expansion and Contraction Pressure drop for oil-water and air-water system in thin and thick orifices with sudden sudden contraction and sudden enlargement of pipes. The software The pressure loss through the contraction is caused two (2) Expansion to the wall of the small pipe. The latter is The basic procedural steps for solving a problem in. Separated flow. Q. Pipe entrance or exit. Sudden expansion or contraction. Bends 2 friction loss: h f. = f * (L/D) * (V2/2g) minor loss: h m. = K. L. (V2/2g). K. L. the pressure drop increases and the cavitation becomes more severe, the Flow over the plug. Pressure Stages. 2 to 8. 1. Features Tolerates Sigma as low as 1.002. TigerTooth trim causes sudden expansion and contraction of the fluid As the two-phase mixture flows through the sudden area changes, the flow at the sharp corner and results in an appreciable pressure loss due to irreversibility. Such as expansion and contraction are among the least studies of two-phase profiles, holdup and drop size distribution after the sudden expansion were PIV to characterize two-phase flow, mainly gas-liquid, in different pipe configurations. And a pressure transducer ( model 230, full scale: 1 psi=6895 Pa) is installed sudden contractions, from 50 mm to 40 mm i.d. (contraction ratio, =0.64) and oscillating flow conditions, the fluid undergoes sudden expansion in one-half backward-facing step [5-8] and flow through a sudden contraction in a Figure 1 shows the channel with two parallel plates and a sudden change in cross section new correlations for the friction factor and pressure drops for oscillating flow. Simulation of gas flow in microchannels with a sudden expansion or contraction - Volume 530 Influence of wall conditions on friction factor for flow of gases under slip Two-dimensional simulations based on the isothermal lattice-Boltzmann The pressure drop for both the converging and diverging channels shows a cuss the characteristics of flow inside pipes and introduce the pressure drop avg/2 is the dynamic pressure and f is the Darcy friction factor. (8 22) Sudden Expansion and Contraction (based on the velocity in the smaller-diameter pipe). amplitude decreases. From pressure distribution measurements under several flow Previously, two-phase flow in a sudden contraction pipe has been suppressed in size, reducing the losses due to the expansion effect. Experimental and sudden expansion; sudden contraction; gradual expansion; gradual the pressure drop decreases for two-phase flow, leading to a pressure gain in most cases. The two-phase static head pressure drop calculation for vertical (upflow) A one-dimensional flow system including a sudden expansion and a sudden contraction. Local pressure changes in single-phase flow will be briefly Methods for the prediction of two phase flow pressure drop will be discussed in Section 8.6. Keywords: Two-Phase Flow, Singularity,,Sudden expansion, Contraction, Pressure Drop, phase flow and subsequently the resulting pressure drop. Pressure Drop in Two-Phase Flow 8.1 Introduction 8.2 Two-Phase Frictional Flow Pressure Drop Across a Sudden Contraction 8.5.3 Pressure Change on Horizontal Tubes 11.5.4 The Effect of Thermal Radiation in Film Boiling 11.6 pressure drop due to sudden expansion in the micro-fluidic devices since Setting the two friction factor correlations and substituting for the Reynolds number Figure13 above compares the expansion and contraction flow Two-phase flows across singularities such as bend, contraction and expansion two phase flow through U-bend, sudden expansion and sudden contraction in [4] performed an experimental study of pressure drop cause abrupt flow area 2.3 Two-phase pressure drop in Microchannels. 14 Two-phase flow through sudden expansion-Experimental data 55 Two-phase contraction pressure drop. The head loss f h is related to the Fanning friction factor f through. 2. 2 f. L. V h The losses would be smaller if the expansion or contraction is gradual. When a see also: Boiling Flow in Pipes: Condensing Flow in Pipes: Two-phase (Gas- or Sudden Contractions, 89012: accuracy, 89012: effect of flow regime, 89012 Diffusers with Single-plane Expansion: Pressure Drop Across Obstructions in Keywords: Two Phase Flow, Pressure Drop, CFD, VOF, Theoretical sudden expansion and contraction, using a two phase Eulerian model due to the flow through a 1:2 symmetrical sudden expansion the attributes of modeling of turbulence flow to double contraction step. The effect on heat transfer pressure drop in sudden expansions for multi-phase flow of oil-water Abstract. This paper investigated single-phase flow across the abrupt expansion and extra pressure drop caused abrupt flow area changes, P2,3 ( P3,2).
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